CN103189319B - Ballast water treatment system and ballast water treatment method - Google Patents

Abstract

A ballast water treatment system is provided, the ballast water treatment system comprises: a ballast water supply line (107), which connects a water intake (104) with a ballast tank (103); an anti-injury treatment device (102), It is arranged on the circuit (107), and is used to electrically or mechanically kill aquatic organisms in the liquid taken in from the water intake (104); and the liquid medicine supply device (101), which is connected with the circuit (107) Connected to the line (107) to supply the sodium hypochlorite used to kill the aquatic organisms in the liquid taken in from the water intake (104), wherein the liquid medicine supply device (101) is different from the ballast water supply line The second water intake (114) of the water intake (104) connected to (107) is connected, and the liquid taken in from the second water intake (114) is electrolyzed to produce sodium hypochlorite.

Description

Ballast water treatment system and ballast water treatment method

technical field

The invention relates to a ballast water treatment system and a ballast water treatment method.

Background technique

In ships such as oil tankers and large cargo ships, when sailing without loading oil or cargo or with a small amount of oil and cargo, in order to ensure the stability and balance of the ship, ballast tanks (ballast tank) containing ballast water for navigation. This ballast water is usually injected by drawing sea water or the like at the port of unloading, and discharged at the port of loading. Thus, since the seawater of the port of unloading is used as ballast water, the ballast water contains aquatic organisms etc. inhabiting the periphery of the port of unloading, and the aquatic organisms etc. are discharged together with the ballast water at the port of loading.

In recent years, disturbance of the ecosystem due to discharge of such ballast water containing aquatic organisms has become a problem internationally. For this reason, the International Maritime Organization (IMO) passed the ballast water management treaty in 2004, in which the discharge standards of organisms inhabiting discharged ballast water are strictly regulated.

Various methods have been proposed as methods for treating ballast water. Specifically, there are methods such as: a method of removing aquatic organisms by filtration, centrifugation, etc., a method of physically/mechanically killing aquatic organisms, a method of killing aquatic organisms by heating, A method of killing aquatic organisms in a tank or by generating chlorine-based substances (for example, Patent Document 1 and Non-Patent Document 1), and a method of combining these methods.

On the other hand, even if the aquatic organisms in the ballast water can be removed, depending on the concentration of sodium hypochlorite remaining in the drainage, the environment around the port may be damaged. Therefore, the following methods have been proposed: adding a reducing agent for neutralization according to the sodium hypochlorite concentration of the ballast water when discharging; leaving the ballast water so that the residual chlorine concentration of the ballast water is substantially zero (Patent Document 2) .

Patent Document 1: Japanese PCT Publication No. 2007-515289

Patent Document 2: Japanese Patent No. 4262720

Non-Patent Document 1: Yukihiko OKAMOTO et al., JFE Technique No. 25 (February 2010) p.1-6

Contents of the invention

The problem to be solved by the invention

As mentioned above, since the Ballast Water Management Treaty obliges installation of ballast water treatment equipment, new technology capable of treating ballast water is further sought. In Patent Document 1, there is proposed a method of electrolyzing ballast water to generate sodium hypochlorite to kill aquatic organisms in ballast water. However, the killing treatment of aquatic organisms in ballast water only by sodium hypochlorite has the following problems: a large amount of sodium hypochlorite is required, and a large tank for storing sodium hypochlorite is required; in order to generate a large amount of sodium hypochlorite, a large electrolytic treatment device and many amount of electricity. In addition, there is a problem that the generation of sodium hypochlorite and the treatment of ballast water using this sodium hypochlorite are usually carried out during berthing at the port, and a lot of electricity is required for loading and unloading of cargo, water intake and discharge of ballast water during berthing at the port Etc., when carrying out these actions, when power is insufficient, the operation of loading and unloading, taking water will break down, or further cause trouble to break down during the voyage of ship. Therefore, the present invention provides a new ballast water treatment system and ballast water treatment method that can reduce power consumption during berthing at a port, and are small and easy to mount on a ship.

solutions to problems

One aspect of the present invention relates to a ballast water treatment system including: a ballast water supply line connecting a water intake to a ballast tank; On the supply line, it is used to electrically or mechanically kill the aquatic organisms in the liquid taken in from the water intake; and the liquid medicine supply device is connected to the above-mentioned ballast water supply line, and supplies The supply line supplies sodium hypochlorite aqueous solution, and the sodium hypochlorite aqueous solution is used to kill aquatic organisms in the liquid taken in from the above-mentioned water intake, wherein the above-mentioned medicinal liquid supply device is connected to a water intake different from the above-mentioned ballast water supply line. The second water intake is connected, and the liquid taken in from the second water intake is electrolyzed to produce sodium hypochlorite.

Another aspect of the present invention relates to a ballast water treatment method, the method comprising: electrically or mechanically killing aquatic organisms in the liquid taken in from the water intake; supplying an aqueous solution of sodium hypochlorite to the liquid taken in from the water intake and storing the liquid after the above-mentioned killing treatment and supplying the above-mentioned sodium hypochlorite aqueous solution in the ballast tank, the method also includes: at least containing the liquid taken in from the second water intake different from the above-mentioned water intake. The solution for producing sodium hypochlorite is electrolyzed to produce the above aqueous solution of sodium hypochlorite.

The effect of the invention

According to the present invention, it is possible to reduce the power consumption during berthing at a port, and it is small and easy to load on a ship.

Description of drawings

FIG. 1 is a schematic configuration diagram showing an example of a ballast water treatment system in Embodiment 1-1.

A to C of FIG. 2 are schematic configuration diagrams showing an example of the configuration of the chemical solution supply device.

A to D of FIG. 3 are schematic configuration diagrams showing an example of the configuration of the electrical processing device.

FIG. 4A is a flowchart showing an example of a ballast water processing method during a berthing period.

Fig. 4B is a flow chart showing an example of a deballasting method and production of sodium hypochlorite during a voyage.

Fig. 5 is a functional block diagram showing a configuration example of a ballast water control system.

6 is a functional block diagram showing a configuration example of a measurement unit and a control unit included in the ballast water control system, and an example of data recorded in a recording unit.

Fig. 7 is a schematic configuration diagram showing another example of the ballast water treatment system in Embodiment 1-1.

Fig. 8 is a schematic configuration diagram showing another example of the ballast water treatment system in Embodiment 1-1.

Fig. 9 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 1-2.

Fig. 10 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 1-3.

11A is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 1-4.

11B is a schematic configuration diagram showing another example of the ballast water treatment system in Embodiment 1-4.

A and B of FIG. 12 are partial views of the ballast water treatment system in Embodiment 1-4.

Fig. 13 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 1-5.

Fig. 14 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 1-6.

Fig. 15 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 2-1.

FIG. 16 is a schematic configuration diagram showing an example of the configuration of a chemical solution supply device.

Fig. 17 is a functional block diagram showing a configuration example of a ballast water control system in Embodiment 2-2.

Fig. 18 is a functional block diagram showing a configuration example of a measurement unit and a control unit, and an example of data recorded in a recording unit.

Fig. 19 is a flowchart showing an example of a ballast water treatment method in the ballast water treatment system according to Embodiment 2-1.

Fig. 20 is a graph showing an example of a decay curve of sodium hypochlorite.

FIG. 21 shows an example of the structure of a sodium hypochlorite attenuation measurement unit.

Fig. 22 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 2-3.

Fig. 23 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 3-1.

Fig. 24 is a schematic configuration diagram showing an example of the ballast water treatment system in Embodiment 4-1.

Detailed ways

In this specification, "aquatic organisms" include microorganisms inhabiting seas, rivers, lakes, etc., in addition to yeast, mold, plant or animal plankton, eggs or spores of plankton, bacteria, fungi, etc. Small aquatic organisms such as fish, viruses, algae, larvae of shellfish such as snails and bivalve molluscs, larvae of crustaceans such as crabs, etc. In addition, microorganisms capable of inhabiting estuaries connected to the sea, rivers, canals, etc., and the above-mentioned aquatic organisms may also be included.

In this specification, "liquid taken in from the water intake (sometimes simply referred to as "liquid obtained from water intake")" refers to liquid taken from the outside of the ship and stored in ballast tanks to be used as ballast water, Sea water, brackish water, and fresh water may be included. The liquid may be, for example, a liquid containing sodium chloride such as seawater, or a liquid not containing sodium chloride. In addition, the area where the liquid is obtained is not particularly limited, and may be a sea area, a fresh water area, or a fresh sea area. In this specification, "ballast water" refers to liquid stored in a ballast tank, and may include liquid taken in from a water intake for storage in a ballast tank. In addition, in this specification, the water intake connected to the ballast water supply line includes a sea chest (sea-chest).

In this specification, a "ship" refers to a general ship equipped with a ballast tank, and includes, for example, a container ship, a ferry, an oil tanker, a bulk carrier (bulk carrier), a chemical carrier, and an automobile carrier.

[first way]

As a first aspect, the present invention relates to a ballast water treatment system (hereinafter, also referred to as "the first ballast water treatment system of the present invention") comprising: a ballast water supply line that Connecting the water intake with the ballast tank; the killing treatment device, which is arranged on the above-mentioned ballast water supply line, is used to electrically or mechanically kill the aquatic organisms in the liquid taken in from the above-mentioned water intake; and a liquid medicine supply device, which is connected to the above-mentioned ballast water supply line, and supplies an aqueous solution of sodium hypochlorite to the above-mentioned ballast water supply line, and the aqueous solution of sodium hypochlorite is used to kill aquatic organisms in the liquid taken in from the above-mentioned water intake, Wherein, the chemical solution supply device is connected to a second water intake different from the water intake connected to the ballast water supply line, and electrolyzes the liquid taken in from the second water intake to generate sodium hypochlorite.

Ships use a lot of electricity while they are berthing in port, because they perform operations such as taking in and out of ballast water, loading and unloading cargo, and so on. The present invention is based on the insight that as long as sodium hypochlorite is generated during voyages, the amount of electricity used during berthing can be reduced.

According to the present invention of the first aspect, ballast water can be treated by using two devices, an electrical or mechanical killing treatment device and a chemical liquid supply device for supplying sodium hypochlorite, so it can be dispersedly installed in the ship, and can Miniaturization of the sodium hypochlorite generator makes it easy to mount on ships. According to the present invention of the first aspect, by generating sodium hypochlorite during the voyage, it is possible to reduce the power consumption during the berthing period.

In the first way, "electrical or mechanical killing treatment of aquatic organisms (hereinafter, also referred to as "killing treatment device")" includes: separating, removing, destroying and/or killing aquatic organisms by electrical or mechanical means At least a part of the aquatic organisms contained in the liquid taken in from the water intake. The destruction of aquatic organisms includes the destruction of part or all of aquatic organisms. Examples of electrical or mechanical destruction treatment devices include electrolytic treatment devices, centrifugal solid-liquid separation devices, and devices that use water pressure to generate shock waves for processing. As the electrolytic treatment device, a known electrolytic treatment device can be used. The electrolytic treatment device preferably includes, for example, a fixed-bed electrode electrolytic cell. A fixed-bed electrode electrolytic cell includes, for example, a fixed bed for generating polarization and an electrode for power supply for generating polarization. The fixed bed type electrode electrolyzer can be unipolar with one fixed bed, or bipolar with more than two fixed beds. As the voltage applied to the electrodes, there are DC voltage and AC voltage, and AC voltage is preferable. The inter-electrode voltage is, for example, 10 V or less, 5 V or less, or 3 V or less. The inter-electrode voltage is preferably 0.5 to 1.5 V from the viewpoint of reducing power consumption and suppressing generation of unnecessary gas due to electrolysis. When the voltage applied to the electrodes is an AC voltage, it is more preferable that the voltage between the electrodes is approximately 1.5V. When the voltage applied to the electrodes is a DC voltage, it is more preferable that the voltage between the electrodes is approximately 0.75V. The electrolytic treatment device can be either cross flow or dead-end. From the viewpoint of preventing clogging in the electrolytic treatment device and reducing pressure loss, the cross-flow method is preferable. From the same viewpoint, the electrolytic treatment device may also include a backwashing mechanism. As the centrifugal solid-liquid separation device, a known centrifugal solid-liquid separation device can be used, for example, a liquid cyclone and the like can be mentioned.

In the first form, "killing treatment of aquatic organisms" includes: killing, sterilizing, or killing at least a part of aquatic organisms contained in the liquid obtained from water intake and/or ballast water as the treatment target; and/or Inhibit the proliferation of aquatic organisms. As the killing treatment of aquatic organisms, it is preferable to include: supplying sodium hypochlorite aqueous solution to the liquid obtained by drawing water and/or the liquid after the killing treatment of electrical or mechanical means, so as to meet the requirements shown in the following table 1 when the ballast water is discharged. more preferably include: killing, killing and/or inhibiting proliferation of aquatic organisms to meet the ballast water discharge standards shown in Table 1 below when discharging ballast water.

[Table 1]

In the first aspect, the "chemical solution supply device" is a device that supplies an aqueous solution of sodium hypochlorite to the liquid obtained by drawing water and/or the liquid that has undergone electrical or mechanical killing treatment. In the first form, "a second water intake different from the water intake to which the ballast water supply line is connected" refers to a water intake other than a water intake (such as a seawater valve tank) for taking in liquid to be stored in a ballast tank As the water intake, for example, existing water intakes for drinking water and the like on ships may be mentioned. The chemical solution supply device is connected to a second water intake different from the water intake (for example, a sea valve tank) to which the ballast water supply line is connected. Therefore, the chemical solution supply device can produce sodium hypochlorite aqueous solution by electrolyzing the liquid taken in from the second water intake port to generate sodium hypochlorite. Since the chemical solution supply device is connected to the second water intake, water can be taken in without driving a ballast pump or the like, and liquid water intake and sodium hypochlorite generation can be easily performed during the voyage. The water intake of the liquid can be performed using, for example, an existing pump or the like. Examples of conventional pumps include pumps for taking in drinking water, liquids for cleaning, and the like. Generally, such a pump can be driven with less power consumption than a ballast pump, and therefore, by using this conventional pump, it is possible to take in liquid with a small amount of power.

The chemical solution supply device may be any device as long as it generates sodium hypochlorite by electrolysis, and examples include an embodiment including an electrolytic cell and a storage tank. By providing a storage tank, high-concentration sodium hypochlorite is stored and supplied to the ballast water supply line through a pump and a valve as needed. The chemical solution supply device may also include a temperature adjustment unit. By controlling the temperature of the sodium hypochlorite aqueous solution in the chemical solution supply device by using the temperature adjustment unit, it is possible to suppress the decomposition of hypochlorous acid in the sodium hypochlorite aqueous solution stored in the chemical solution supply device, further increase the concentration of available chlorine and reduce the concentration of chloric acid. The temperature of the aqueous solution is, for example, 20°C or lower, preferably 15°C or lower, more preferably approximately 10°C, from the viewpoint of suppressing the decomposition of hypochlorous acid. Examples of the temperature adjustment means include cooling devices such as cooling means, heating devices, and the like. It is preferable that the liquid medicine supply device is equipped with a measuring device capable of measuring the concentration of sodium hypochlorite (hereinafter referred to as "sodium hypochlorite concentration meter" or simply "concentration meter.") and a flowmeter so as to be able to grasp the amount of water supplied to the ballast water supply line. The sodium hypochlorite concentration, preferably they are used to control the sodium hypochlorite concentration supplied to the ballast water supply line.

The chemical solution supply device may also include a sodium chloride storage tank. Thus, for example, even ships navigating in fresh waters can generate sodium hypochlorite. Even for ships navigating in seawater, sodium hypochlorite aqueous solution with higher concentration can be produced by adding sodium chloride to seawater obtained from water intake. Sodium chloride can be either an aqueous solution or a solid.

The chemical solution supply device is connected to the ballast water supply line, and can supply the sodium hypochlorite aqueous solution to the liquid taken in from the water intake connected to the ballast water supply line. The connection position (supply site of sodium hypochlorite aqueous solution) is not particularly limited, for example, between the water intake and the killing treatment device connected to the ballast water supply line, and between the killing treatment device and the ballast tank.

In one embodiment, the liquid medicine supply device may also be connected to a water intake connected to the ballast water supply line (for example, a water intake for ballast water such as a seawater valve tank) in addition to being connected to the second water intake. ) or connected to the water intake connected to the ballast water supply line instead of the second water intake. By connecting both the water intake port for ballast water and the second water intake port, the liquid for producing the sodium hypochlorite aqueous solution can be efficiently taken into the chemical solution supply device. The line connecting the water intake for ballast water and the chemical solution supply device may include a water intake pump different from the ballast pump. Thereby, it is possible to take in the liquid for producing the sodium hypochlorite aqueous solution without driving the ballast pump. In addition, in one embodiment, the chemical solution supply device may also be connected to a ballast pump in addition to being connected to the second water intake, or may be connected to a ballast pump instead of the second water intake.

In one embodiment, the first ballast water treatment system of the present invention may further include a post-processing device for decomposing sodium hypochlorite in the ballast water when the ballast water is discharged. By providing the post-processing device, even when the sodium hypochlorite concentration of the ballast water exceeds the discharge standard when the ballast water is discharged, the ballast water can be quickly discharged and the usage amount of the reducing agent can be reduced. As a post-processing device, for example, it is not particularly limited as long as it can decompose or reduce hypochlorous acid. From the viewpoint of reducing the amount of reducing agent used to reduce the operating cost of ballast water treatment, it is preferable to use a hypochlorous acid that can be decomposed. Chloric acid catalyst device. As a catalyst, nickel and palladium are mentioned, for example. The post-processing device may also have an adsorbent such as alumina in addition to the catalyst described above. The post-processing device may be arranged on the line through which the ballast water passes when the ballast water is discharged. For example, it can be arranged on the ballast water supply line, or can be arranged on the line by connecting a branch line to the ballast water supply line. It is preferable that the post-processing device also serves as a reducing agent supply device for reducing the sodium hypochlorite aqueous solution.

The first ballast water treatment system of the present invention may include an acidic liquid storage tank (acidic liquid supply device) for controlling the pH of the liquid supplied with the aqueous sodium hypochlorite solution to be equal to or lower than the pKa value of hypochlorous acid. The pKa value of sodium hypochlorite is about 7.5. Therefore, before the sodium hypochlorite aqueous solution is supplied, the killing ability of hypochlorous acid can be improved by controlling the pH value of the liquid below the pKa value, preferably in the range of pH 5 to 6, thereby improving the killing of aquatic organisms. capacity processing efficiency. In addition, even low-concentration sodium hypochlorite can sufficiently perform sterilization treatment, and can reduce corrosion of piping and ballast tanks. Examples of the acidic liquid stored in the acidic liquid storage tank include hydrochloric acid, sulfuric acid, and the like, and hydrochloric acid is preferable from the viewpoint of high acidity. The acidic liquid storage tank is connected to the ballast water supply line. For example, the acidic liquid storage tank may be connected to the ballast water supply line in such a manner that the acidic liquid can be supplied to the extracted liquid before the sodium hypochlorite aqueous solution is supplied.

As another aspect, this invention relates to the water injection method of the ballast water using the 1st ballast water treatment system of this invention, and the ship provided with the 1st ballast water treatment system of this invention.

As another aspect, the present invention relates to a ballast water treatment method (hereinafter also referred to as "the first ballast water treatment method of the present invention"), the method includes: electrically or mechanically Killing the aquatic organisms in the liquid; supplying the sodium hypochlorite aqueous solution to the liquid taken in from the water intake; and storing the liquid after the above-mentioned killing treatment and supplying the above-mentioned sodium hypochlorite aqueous solution in the ballast tank, the method also includes: The sodium hypochlorite aqueous solution is produced by electrolyzing a liquid for producing sodium hypochlorite including at least a liquid taken in from a second water intake different from the water intake.

According to the first ballast water treatment method of the present invention, since electrical or mechanical killing treatment and treatment using sodium hypochlorite are performed, for example, shellfish and crustacean larvae which are difficult to be sufficiently killed only by sodium hypochlorite treatment can be easily killed. According to the first ballast water treatment method of the present invention, water can be easily taken from the outside of the ship to the chemical solution supply device even during the voyage, thereby achieving an effect that the sodium hypochlorite aqueous solution can be easily produced during the voyage. The first ballast water treatment method of the present invention can be performed using the first ballast water treatment system of the present invention.

In the first ballast water treatment method of the present invention, the sodium hypochlorite aqueous solution may be supplied before or after the electrical or mechanical killing treatment, or both before and after the treatment.

In the first ballast water treatment method of the present invention, from the viewpoint of reducing the amount of power consumption during berthing at a port, it is preferable to perform the production of the sodium hypochlorite aqueous solution and/or the extraction of the liquid used for the production during the voyage, Even more preferably both are performed during the voyage. It is preferable to store the sodium hypochlorite aqueous solution produced during the voyage in the medical solution supply device. Thereby, the amount of power consumption during the berthing period can be reduced, and the supply of the sodium hypochlorite aqueous solution can be quickly started. It is preferable to carry out the manufacture and storage of the sodium hypochlorite aqueous solution while controlling the temperature. By controlling the temperature, the decomposition of hypochlorous acid in the sodium hypochlorite aqueous solution stored in the chemical solution supply device can be suppressed, and the concentration of available chlorine can be further increased and the concentration of chloric acid can be reduced.

In the 1st ballast water treatment method of this invention, the liquid used for sodium hypochlorite manufacture may contain the liquid taken in from the said water intake port for taking in the liquid stored in the ballast tank.

Next, the present invention will be described in detail by showing preferred embodiments. However, the present invention is not limited to the embodiments shown below.

(Embodiment 1-1)

FIG. 1 is a schematic configuration diagram showing the configuration of a ballast water treatment system in Embodiment 1-1 of the present invention.

As shown in FIG. 1 , the ballast water treatment system according to Embodiment 1-1 includes a chemical solution supply device 101 , an anti-injury treatment device 102 , and a ballast water supply line 107 . According to the ballast water treatment system of Embodiment 1-1, the aquatic organisms are treated by using the liquid medicine supply device 101 and the killing treatment device 102 that supply the sodium hypochlorite aqueous solution, so it is possible to treat the aquatic organisms with a lower concentration of sodium hypochlorite than in the past. Corrosion of piping and ballast tanks can be prevented by killing them.

The ballast water supply line 107 is a line for supplying the liquid taken in from the water intake 104 to the ballast tank 103, and one end thereof is connected to the water intake (seawater valve box) 104 and the strainer (strainer) for taking in the ballast water. 105 and the ballast pump 106 are connected, and the other end is connected with the ballast tank 103 . The ballast tank 103 is usually divided into a plurality of ballast tanks 103a to 103d.

The killing treatment device 102 is arranged on the ballast water supply line 107 and between the ballast pump 106 and the ballast tank 103 . The chemical solution supply device 101 is connected to the ballast water supply line 107 via the chemical solution supply line 109 , and can supply the sodium hypochlorite aqueous solution to the liquid treated by the killing treatment device 102 .

The chemical solution supply device 101 is connected to a second water intake 114 different from the water intake (sea valve tank) 104 via a line 110 . Accordingly, the chemical liquid supply device 101 can take in liquid for generating sodium hypochlorite from outside the ship without driving the ballast pump 106 . A pump 116 and a strainer 115 for taking in liquid may also be provided on the water intake line 110 . As the second water intake 114 and the pump 116 , existing water intakes, pumps, and the like for drinking water, liquid for cleaning, and the like on a ship can be used, respectively. The chemical solution supply line 109 may include a pump for sending the sodium hypochlorite aqueous solution to the ballast water supply line 107 and a valve M for controlling the supply amount of the sodium hypochlorite aqueous solution. In addition, instead of the pump arranged on the chemical solution supply line 109 , a pump (not shown) built in the chemical solution supply device 101 may be used to send the sodium hypochlorite aqueous solution to the ballast water supply line 107 . In addition, the chemical solution supply line 109 may include, for example, a sodium hypochlorite concentration meter and a flow meter for measuring the supply amount of sodium hypochlorite supplied to the ballast water supply line 107 . As the flow meter, for example, an integrated flow meter FM capable of measuring a total flow rate and an instantaneous flow rate is preferable.

As the chemical solution supply device 101 , for example, a chemical solution supply device 201 of the form shown in A of FIG. 2 can be used. A of FIG. 2 is a schematic configuration diagram showing an example of the configuration of an apparatus capable of generating sodium hypochlorite by electrolysis of liquid. As shown in A of FIG. 2 , the chemical solution supply device 201 includes a storage tank 211 for storing an aqueous solution of sodium hypochlorite and an electrolytic tank 212 for generating sodium hypochlorite by electrolytic treatment. The storage tank 211 is connected to the lines 110 and 109 , can take in liquid for generating sodium hypochlorite from outside the ship through the line 110 , and can supply the stored aqueous sodium hypochlorite solution to the ballast water supply line 107 through the line 109 . The storage tank 211 is connected to the electrolytic tank 212 through lines 213 and 214 , and the sodium hypochlorite produced in the electrolytic tank 212 is stored in the storage tank 211 through the line 214 . From the viewpoint of generating and storing sodium hypochlorite, it is preferable that the storage tank 211 and the electrolytic tank 212 can be circulated through the line 213 and the line 214 . The line 213 and/or the line 214 may also be equipped with a pump for sending liquid. The line 213 includes a heat exchanger 215 and a chiller unit 216 for controlling the temperature of the sodium hypochlorite aqueous solution.

It is preferable that the storage tank 211 is provided with a heat insulating material so as to control the temperature of the stored sodium hypochlorite aqueous solution and/or the liquid used to produce the aqueous solution.

It is preferable that the storage tank 211 is equipped with the sodium hypochlorite concentration meter. Thus, the concentration of sodium hypochlorite in the storage tank 211 can be managed, and based on the concentration of sodium hypochlorite in the storage tank 211, for example, the amount of sodium hypochlorite produced, the amount of liquid supplied to the storage tank 211, and the liquid sent to the electrolytic tank 212 can be adjusted. The amount is controlled.

The storage tank 211 and the electrolytic tank 212 may also be provided with a blower 217 and a discharge port 218 for discharging generated gas (especially hydrogen gas).

In addition to the line 110 connected to the second water inlet 116 , the chemical solution supply device 101 may include a line (not shown) capable of taking in liquid obtained by taking in water from the ballast pump 106 . By being connected to the ballast pump 106, the liquid for producing the sodium hypochlorite aqueous solution can be taken in efficiently.

As another example of the chemical solution supply device 101, for example, the forms shown in B and C of FIG. 2 can be mentioned. B and C of FIG. 2 are schematic configuration diagrams showing other examples of the configuration of an apparatus capable of generating sodium hypochlorite by electrolysis. The chemical solution supply device 201 of the form shown in FIG. 2B includes an electrolytic tank 212 connected to the line 110 and a storage tank 211 connected to the line 109 . The chemical solution supply device 201 of this embodiment takes in the liquid for generating sodium hypochlorite from outside the ship to the electrolytic tank 211 through the line 110 , and generates sodium hypochlorite in the electrolytic tank 211 . The generated sodium hypochlorite aqueous solution is supplied and stored in the storage tank 211 through the line 213 , and is supplied to the ballast water supply line 107 through the line 109 as needed. The line 110 may include a heat exchanger (not shown) and a cooling unit (not shown) for controlling the temperature of the sodium hypochlorite aqueous solution.

In B of FIG. 2 , an example in which the storage tank 211 is connected to the electrolytic tank 212 through the line 213 is shown, but the chemical solution supply device 201 of this embodiment is not limited thereto. The electrolytic tank 212 is supplied with a liquid line, and the circulation between the storage tank 211 and the electrolytic tank 212 can be performed through this line and the line 213 .

The chemical solution supply device 201 of the form shown in C of FIG. 2 may be a device including only one treatment tank 219 . The treatment tank 219 generates sodium hypochlorite by electrolytic treatment, and stores an aqueous solution of sodium hypochlorite. By allowing the processing tank 219 to function as both a storage tank and an electrolytic tank, for example, the chemical solution supply device 201 can be further downsized.

The killing treatment device 102 is a device for killing aquatic organisms electrically or mechanically. As the destruction treatment device 102 , for example, an electrical treatment device of the form shown in A to D of FIG. 3 can be used. A to D of Fig. 3 are schematic structural diagrams showing an example of the structure of a fixed bed electrode electrolyzer, and A of Fig. 3 shows a monopolar fixed bed electrode electrolyzer arranged in a cross-flow manner on the ballast water supply line 107. An example of the cell, B and C of Figure 3 represent an example of a bipolar fixed-bed electrode electrolyzer disposed on the ballast water supply line 107 in a cross-flow manner, and D of Figure 3 represents an example of a dead-end disposed on the ballast water supply line 107. An example of a bipolar fixed-bed electrode electrolyzer on the water supply line 107 . In A to D of FIG. 3 , the same symbols are attached to the same constituent elements.

As shown in A of FIG. 3 , the unipolar fixed-bed electrode electrolyzer includes an electrolytic cell main body 302, a fixed-bed electrode 311, an electrode 312 for power supply, and a power supply 313 so that the flow of the liquid (black arrow in A of FIG. 3 ) is arranged on the ballast water supply line 107 so as to be in the horizontal direction (tangential direction) with respect to the membrane surface of the fixed bed electrode 311 . By arranging the fixed-bed electrode electrolytic cell in a cross-flow manner, the fouling on the membrane surface of the fixed-bed electrode 311 can be easily removed, and pressure loss can be suppressed. When the liquid taken in from the water inlet 104 is supplied to the fixed-bed electrode electrolytic cell, the supplied liquid flows in a direction perpendicular to the membrane surface of the fixed-bed electrode 311 (the hollow arrow of A in FIG. 3 ). When the aquatic organisms in the liquid come into contact with the fixed bed electrode 311 through the liquid flow, the exchange of electrons occurs between the surface of the fixed bed electrode 311 and the cells of the aquatic organisms, which can weaken the activities of the aquatic organisms, or can destroy or exterminate them. Aquatic organisms, or damage parts of aquatic organisms. When stagnant substances and dirt are accumulated on the membrane surface of the fixed-bed electrode 311 , they can be easily removed by opening a valve disposed on the line 303 to clean them. One end of the line 303 is connected to the overboard, and the removed residue is discharged overboard.

As the material of the fixed bed electrode 311, as long as the liquid taken in from the water inlet 104 can be permeated, for example, a porous material, a carbon-based material, and a metal material are mentioned, and these materials are coated with noble metals. material etc. Examples of the carbon-based material include activated carbon, graphite, and carbon fiber. Examples of metal materials include nickel, copper, stainless steel, SUS (stainless steel), iron, and titanium. Among them, as the material of the fixed bed electrode 311 , SUS and titanium are preferable from the viewpoint of strength and corrosion resistance. The shape constituting the fixed bed electrode 311 is not particularly limited, and examples thereof include balls, pellets, fibers, felt, woven cloth, and porous blocks. The aperture diameter of the fixed bed electrode 311 is, for example, greater than or equal to 100 μm. As a material of the electrode 312 for power feeding, titanium is preferable, for example. Examples of the shape of the power feeding electrode 312 include a flat plate, expanded metal, and a perforated plate. The power supply 313 can be either a DC power supply or an AC power supply, preferably an AC power supply.

As shown in B of FIG. 3 , the bipolar fixed-bed electrode electrolyzer includes an electrolyzer main body 302 , electrode connection parts 314 and 315 for power supply, a fixed bed 316 , a spacer 317 and a power supply 313 . The fixed bed 316 is arranged between the electrode connection parts 314 and 315 for power supply, and the spacers 317 are respectively arranged between the electrode connection part 314 for power supply and the fixed bed 316, between the fixed beds 316, and between the fixed bed 316 and the electrode connection for power supply. Between Section 315. Using an AC power supply as the power source 313, when the power supply electrode connection parts 314, 315 are energized, the membrane surfaces on the power supply electrode connection part 314 side and the power supply electrode connection part 315 side of each fixed bed 316 are alternately polarized into positive and negative polarities. Negative, a porous anode and a porous cathode are formed on the membrane face of each fixed bed 316 . By using the bipolar fixed electrode electrolytic cell in this way, the number of fixed beds 316 arranged in the electrolytic cell increases, so the number of times aquatic organisms come into contact with the fixed bed 316 can be increased, and treatment efficiency can be improved.

Except that a fixed bed 316 is configured in the bipolar fixed bed electrode electrolyzer of C in FIG. 3 , the other structures are the same as those in FIG. 3B .

The bipolar fixed-bed electrode electrolyzer in D of FIG. 3 has the same structure as that of FIG. 3B except that the dead-end method is used instead of the cross-flow method and three fixed beds 316 are arranged.

On the ballast water supply line 107 , for example, a valve (not shown) is preferably disposed between the connection portion with the chemical solution supply line 109 and the killing treatment device 102 . Thereby, the amount of liquid (ballast water) injected into the ballast tank 103 can be controlled based on the measurement value of the flow meter FM (not shown) arranged between the ballast pump 106 and the killing treatment device 102 . From the viewpoint of easy control of the injection amount into the ballast tank 103, the valve is preferably an electric valve.

One Embodiment of the ballast water treatment using the ballast water treatment system of this Embodiment 1-1 is demonstrated based on FIG. 4A and FIG. 4B.

First, as shown in FIG. 4A , when the voyage is completed ( S401 ) and the port is docked, unloading starts ( S402 ). In addition, the intake and treatment of ballast water are started (S403), and the pumps of the ballast pump 106, the destruction treatment device 102, and the chemical solution supply line 109 of the chemical solution supply device 101 are started (S404). As a result, intake of liquid through the intake port 104 and treatment of the ballast water begin. The liquid taken in through the water inlet 104 is supplied to the killing treatment device 102 after removing large garbage and the like by the strainer 105, and the killing treatment of aquatic organisms contained in the liquid is performed. In the killing treatment device 102 , relatively large aquatic organisms contained in the liquid obtained by drawing water are separated, removed, destroyed and/or killed through electrical or mechanical treatment. Next, a sodium hypochlorite aqueous solution is supplied from the chemical liquid supply device 101 to the liquid treated by the killing treatment device 102, and the aquatic organisms are killed by the sodium hypochlorite. A liquid containing sodium hypochlorite is supplied to the ballast tank 103 through a ballast water supply line 107 . The sodium hypochlorite concentration in the supplied sodium hypochlorite aqueous solution is, for example, greater than or equal to 5000 ppm, and its pH value is, for example, 8-9. This ballast water treatment is performed while controlling the injection amount of ballast water and/or the supply amount of sodium hypochlorite (S405). If in the ballast tank 103, inject the ballast water of specified amount, and the concentration of the sodium hypochlorite in the ballast tank 103 is controlled to the concentration of regulation (S406), then end the intake of ballast water and process (S407), The pumps of the ballast pump 106, the killing treatment device 102, and the chemical solution supply line 109 of the chemical solution supply device 101 are stopped (S408). After the killing treatment by the killing treatment device 102 , the sodium hypochlorite aqueous solution is supplied for killing, thereby efficiently killing aquatic organisms contained in the liquid obtained by drawing water and/or the ballast water in the ballast tank.

Next, as shown in FIG. 4B , when the voyage is completed and the port is docked, deballasting (S411) is started, and the ballast pump 106 and the concentration meter are started (S412). As a result, discharge of the ballast water from the ballast tank 103 to the outside of the ship is started. Ballast water is introduced from the ballast tank 103 into the ballast water supply line 107 . The sodium hypochlorite concentration of the discharged ballast water is measured by a concentration meter arranged on the ballast water supply line 107 (S413). It is judged whether the measured sodium hypochlorite concentration satisfies the discharge standard (S414), and when the sodium hypochlorite concentration is lower than 0.2ppm, it is considered to meet the discharge standard and discharged into the sea via the water intake 104 (deballasting) (S415). When the sodium hypochlorite concentration is equal to or greater than 0.2 ppm, a neutralizer is added (S416), and the measurement of the sodium hypochlorite concentration (S413) and the above-mentioned judgment (S414) are performed again. When all the ballast water in the ballast tank 103 is discharged, deballasting is completed, and the concentration meter and the ballast pump 106 are stopped (S417).

When deballasting and loading are completed, the port departs (S421). During sailing, the pump 116 is activated to take liquid into the medical solution supply device 101 through the second water intake port 114 . In addition, the ballast pump 106 may be activated together with the activation of the pump 116 to take the liquid into the chemical solution supply device 101 through the seawater valve tank. The temperature control unit (S422) is activated to control the temperature of the liquid for generating sodium hypochlorite to an optimum temperature for suppressing the decomposition of hypochlorous acid. If the predetermined amount of liquid has been stored in the storage tank 211, the pump 116 is stopped (S423). At this time, it is preferable that the temperature control means perform inverter operation (inverter operation) without stopping. Start the rectifier, pump, blower, etc. in the liquid medicine supply device 101 according to the sailing time (port time) to start the electrolysis of the liquid, thereby generating sodium hypochlorite to produce an aqueous sodium hypochlorite solution (S424). When the concentration of sodium hypochlorite stored in the storage tank 211 becomes equal to or greater than a predetermined concentration, for example, 5000 ppm (S425), generation of sodium hypochlorite is terminated (S426). The produced sodium hypochlorite aqueous solution is stored in the chemical solution supply device 101 in advance. The pH value of the stored sodium hypochlorite aqueous solution is, for example, 8-9. It is preferable that the temperature control means is operated without stopping even after the sodium hypochlorite aqueous solution is produced until the sodium hypochlorite aqueous solution is supplied.

For example, the production of the sodium hypochlorite aqueous solution and the supply of the sodium hypochlorite aqueous solution in the chemical solution supply device 101 can be controlled by a ballast water control system as shown in FIG. 5 . FIG. 5 is a functional block diagram showing an example of the configuration of a ballast water control system. The ballast water control system of Fig. 5 is equipped with: measuring part 501, and it includes the concentration meter etc. on the ballast water supply line 107; Recording part 502, it records the sodium hypochlorite concentration measured by measuring part 501; Based on the concentration data of the recording unit 502, the supply amount of sodium hypochlorite supplied from the chemical solution supply device 101, the increase or decrease of the injection amount of ballast water injected into the ballast tank 103, etc. The amount of sodium hypochlorite supplied to the carrier tank 103, the injection amount of ballast water, and the like are controlled.

The measuring unit 501 may also be configured as shown in the measuring unit 601 in FIG. 6 . That is, in addition to the sodium hypochlorite concentration meter on the ballast water supply line 107, the measurement unit 501 can also include the sodium hypochlorite concentration meter of the storage tank 211 of the chemical solution supply device 101, the sodium hypochlorite concentration meter of the unballasting line, Sodium hypochlorite concentration meter at the discharge end. The measurement results in the measurement section 501 can be recorded in the recording section 502 .

The recording unit 502 can record one or more pieces of data as shown in the recording unit 602 of FIG. 6 . That is, the concentration of sodium hypochlorite stored in the storage tank 211 measured by the measurement unit 601, the ballast time (ballast water treatment time), the amount of ballast water contained in the ballast tank 103, and navigation data (preferably including at least time until drainage), the supply amount of sodium hypochlorite aqueous solution, the sodium hypochlorite concentration of the liquid in the ballast water supply line 107 after the sodium hypochlorite aqueous solution is supplied, the deballasting time and deballasting amount, and the ballast treated by the post-processing device The sodium hypochlorite concentration of the water, the supply amount of the reducing agent, and the sodium hypochlorite concentration after supplying the reducing agent. The recording unit 602 can also record in advance the sodium hypochlorite concentration range to be maintained in the ballast tank 103 .

The control unit 503 can be configured as shown in the control unit 603 of FIG. 6 . That is, the control unit 603 may include an analysis unit 611 , a sodium hypochlorite generation control unit 612 , and a supply amount control unit 613 . The analysis unit 611 determines, for example, based on the data recorded in the recording unit 602 , the supply amount of the sodium hypochlorite aqueous solution to be supplied to the ballast water supply line 107 , the supply amount of the reducing agent, the amount of sodium hypochlorite to be generated in the chemical solution supply device 101 , and the like. The sodium hypochlorite generation control unit 612 controls, for example, the amount of sodium hypochlorite generated in the chemical solution supply device 101 based on the determination described above. The supply amount control unit 613 controls, for example, the amount of sodium hypochlorite supplied from the chemical solution supply device 101 to the ballast tank 103 based on the determination described above.

In the present embodiment 1-1, the method of supplying an aqueous solution of sodium hypochlorite from the liquid medicine supply device 101 to the space between the killing treatment device 102 and the ballast tank 103, that is, the liquid treated by the killing treatment device 102, is taken as an example. For illustration, but the present invention is not limited thereto. For example, as shown in FIG. 7 , a chemical liquid supply line 109 may be connected between the ballast pump 106 and the killing treatment device 102 to supply an aqueous solution of sodium hypochlorite to the liquid before killing treatment. In addition, the following mode is also possible: as shown in FIG. 8 , the liquid medicine supply device 101 has a liquid medicine supply line 109 connected between the killing treatment device 102 and the ballast tank 103, and a liquid medicine supply line 109 connected to the ballast pump 106 and the killing treatment machine. The second chemical solution supply line 809 between the devices 102 supplies sodium hypochlorite aqueous solution to the liquid before and after the killing treatment, respectively.

(Embodiment 1-2)

Fig. 9 is a schematic configuration diagram showing the configuration of a ballast water treatment system in Embodiment 1-2 of the present invention. In FIG. 9 , the same reference numerals are attached to the same components as those in FIG. 1 .

The ballast water treatment system according to Embodiment 1-2 includes a post-processing device 901, a line 902 for supplying ballast water in the ballast tank 103 to the post-processing device 901, and a line 902 for deballasting the ballast water. The configuration of the ballast water treatment system in Embodiment 1-1 is the same as that of the ballast water treatment system in Embodiment 1-1 except for the discharge line (deballasting line) 903 and the reducing agent supply device (reducing agent storage tank) 904 . According to the ballast water treatment system of Embodiment 1-2, since the post-processing device 901 is provided, the usage-amount of the reducing agent can be reduced.

One end of the line 902 is connected to the ballast water supply line 107 and the other end is connected to the post-processing device 901 , and the ballast water in the ballast tank 103 can be supplied to the post-processing device 901 through the ballast water supply line 107 .

The post-processing device 901 is a device that performs processing for reducing the sodium hypochlorite concentration of the ballast water to a discharge standard or lower and/or reducing the usage amount of the reducing agent when the ballast water is discharged.

The reducing agent supply device 904 is used to reduce the sodium hypochlorite in the discharged ballast water so that the sodium hypochlorite concentration becomes equal to or lower than the discharge standard. The reducing agent supply device 904 is connected to the discharge line 903 and can supply the reducing agent to the discharged ballast water treated by the post-processing device 901 . Examples of the reducing agent include sodium thiosulfate, sodium sulfite, and the like.

The discharge line 903 may also be equipped with devices such as a sodium hypochlorite concentration meter for measuring the sodium hypochlorite concentration of the discharged ballast water and a microorganism inspection device for measuring the amount of aquatic organisms contained in the discharged ballast water. The number of living cells (especially microorganisms). Preferably, as shown in FIG. 9 , the sodium hypochlorite concentration meter is arranged at least between the post-processing device 901 and the ballast pump 106 and at the discharge end of the discharge line 903 (near the ballast water discharge port).

One embodiment of ballast water treatment when ballast water is discharged using the ballast water treatment system of Embodiment 1-2 will be described.

The ballast pump 106 is driven to start draining ballast water from the ballast tank 103 . The ballast water in the ballast tank 103 is supplied to the post-processing device 901 via the ballast water supply line 107 and the line 902 . The ballast water subjected to the decomposition treatment of sodium hypochlorite in the post-processing device 901 is supplied to the killing treatment device 102 through the discharge line 903 and discharged to the outside of the ship. At this time, aquatic organisms contained in the discharged ballast water may be treated in the killing treatment device 102 .

In addition, in the present Embodiment 1-2, the embodiment in which the discharge line 903 is connected to the killing treatment device 102 has been described as an example, but the present invention is not limited thereto. For example, the discharge line 903 may not be connected to the killing treatment device 102 . That is, a method of discharging the ballast water without passing through the destruction treatment device 102 may also be employed.

(Embodiment 1-3)

Fig. 10 is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 1-3 of the present invention. In FIG. 10 , the same reference numerals are attached to the same components as those in FIG. 1 .

The ballast water treatment system according to Embodiment 1-3 is provided with an acidic liquid storage tank 1001 for controlling the pH value of the liquid supplied with the aqueous sodium hypochlorite solution below the pKa value of sodium hypochlorite, and the ballast water supply line 107 is provided with a pH meter, Other than that, it is the same as the structure of the ballast water treatment system of Embodiment 1-1.

The ballast water treatment system of Embodiment 1-3 is equipped with an acidic liquid storage tank 1001, so that the pH value of the liquid supplied with sodium hypochlorite can be controlled within the range where the killing ability of hypochlorous acid is optimal, and the sodium hypochlorite can be decontaminated in this state. Supply and kill treatment. Therefore, it is possible to improve the treatment efficiency of the treatment of killing aquatic organisms by sodium hypochlorite. The optimum pH is, for example, 4 to 6, preferably approximately 5.

(Embodiments 1-4)

11A is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 1-4 of the present invention. In FIG. 11A , the same reference numerals are attached to the same constituent elements as in FIG. 1 .

The ballast water treatment system in Embodiments 1-4 includes a ballast water supply line 107, a chamber (chamber) 1101 arranged on the ballast water supply line 107, and an electrodestructive treatment device arranged at the outlet of the chamber. 102 and the chemical solution supply device 101 for supplying the sodium hypochlorite aqueous solution to the ballast water supply line 107 . According to the ballast water treatment system of Embodiment 1-4, the ballast water taken in from the water intake port 104 can be temporarily stored in the chamber 1101 and supplied to the electrodestructive treatment device 102 . Therefore, the flow rate of the ballast water supplied to the electro-killing treatment device 102 can be substantially fixed, thereby increasing the number of times the aquatic organisms in the ballast water contact the electro-killing treatment device 102 (especially the fixed bed) to improve the efficiency of killing treatment. The ballast water treatment system of Embodiment 1-4 is provided with a chamber 1101, and the electrodestructive treatment device 102 is arranged at the discharge port of the chamber 1101, except that the structure is the same as that of the ballast water treatment system of Embodiment 1-1. .

For example, ballast water is treated using the ballast water treatment system of Embodiment 1-4 as follows. First, the ballast water taken in from the water intake port 104 is introduced into the chamber 1101 through the ballast water supply line 107 , and then supplied to the electrodestructive treatment device 102 through the discharge port of the chamber 1101 . The electrical killing treatment is performed in the electrical killing treatment device 102 . After the ballast water after the killing treatment is introduced into the ballast water supply line 107 , the sodium hypochlorite aqueous solution is supplied from the chemical solution supply device 101 , and then stored in the ballast tank 103 through the ballast water supply line 107 .

The diameter of the chamber 1101 is preferably larger than the diameter of the ballast water supply line 107 , more preferably tapered from the connection with the ballast water supply line 107 to the inside of the chamber 1101 . According to this structure, the flow velocity of the ballast water in the chamber 1101 can be further made slower than the flow velocity in the ballast water supply line 107 . Therefore, the number of times that the aquatic organisms in the ballast water come into contact with the electro-killing treatment device 102 can be further increased. It is preferable that the discharge port of the chamber 1101 is formed at the bottom of the chamber 1101 . According to this configuration, the ballast water discharged from the bottom of the chamber 1101 can be treated by the electrodestructive treatment device 102 . When the flow rate in the chamber 1101 becomes slow, the aquatic organisms in the ballast water will stay at the bottom of the chamber 1101 due to the difference in specific gravity between the ballast water and the ballast water, so the number of times the aquatic organisms contact the electro-killing treatment device 102 can be further increased .

The ballast water supply line 107 may further include a filter. FIG. 11B is a schematic configuration diagram showing another example of the configuration of the ballast water treatment system in Embodiment 1-4. In FIG. 11B , the same symbols are attached to the same constituent elements as those in FIG. 11A . According to the ballast water treatment system according to the first aspect, by including the filter 1102, for example, plankton species in the ballast water to be supplied to the ballast tank, dead bodies of aquatic organisms that have been sterilized by the electro-killing treatment device 102, etc. can be captured. .

In FIG. 11B , the form in which the filter 1102 is disposed between the connection portion with the chemical solution supply device 101 and the ballast tank 103 is shown, but the present invention is not limited thereto, and may be disposed in a wound treatment device, for example. 102 and ballast tank 103. The number of filters 1102 is not particularly limited, and may be one or more than two. When disposing two or more filters, for example, as shown in FIG. 11B , the ballast water supply line 107 may be branched and one filter may be disposed on each branch. The filter 1102 is not particularly limited, and for example, a filter having a pore diameter of 10 μm to 200 μm can be used.

FIG. 12 shows a partial view showing a part of the ballast water treatment system according to Embodiment 1-4. A and B of Fig. 12 are figures taken out of the ballast water supply line 107 that connect the killing treatment device 102 and the chemical solution supply device 101 (the part surrounded by a dotted line in Fig. An example of the form of the portion where the processing device 102 is connected to the chemical solution supply device 101 . The part that connects the killing treatment device 102 and the liquid medicine supply device 101 can be, for example, a bent portion that is bent into a crank shape as shown in A of FIG. The liquid supply device 101 forms an inclined portion that goes uphill gradually. When the ballast water supply line 107 has a curved portion, it is preferable that the chemical solution supply device 101 is disposed near the upper end of the curved portion as shown in A of FIG. 12 . When the ballast water supply line 107 has an inclined portion, it is preferable that the chemical solution supply device 101 is disposed near the upper end of the inclined portion as shown in FIG. 12B . According to these modes, for example, the sodium hypochlorite aqueous solution supplied from the chemical solution supply device 101 can be supplied to the destruction treatment device 102 . Thereby, the liquid remaining in the destruction treatment device 102 can be sterilized by sodium hypochlorite. The slope of the slope is not particularly limited as long as it is a gentle slope, for example, it is equal to or greater than 1/200, preferably equal to or greater than 1/100 and equal to or less than 1/50. A valve can also be arranged on the slope. Thereby, the amount of the sodium hypochlorite aqueous solution supplied to the destruction treatment apparatus 102 can be controlled.

In Embodiments 1-4, the order of the supply of the sodium hypochlorite aqueous solution and the electrodestructive treatment device is not particularly limited, and the sodium hypochlorite aqueous solution may be supplied before the treatment by the electrodestructive treatment device.

(Embodiments 1-5)

Fig. 13 is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 1-5 of the present invention. In FIG. 13 , the same reference numerals are attached to the same components as those in FIG. 1 .

The ballast water treatment system in Embodiments 1-5 includes a ballast water supply line 107, a chemical solution supply device 101 for supplying an aqueous solution of sodium hypochlorite to the ballast water supply line 107, and a ballast water supply line 107. The chamber 1301 and the electrodestructive treatment device 1302, the electrodestructive treatment device 1302 is arranged in the chamber 1301. According to the ballast water treatment system of Embodiment 1-5, since the electrodestructive treatment device 1302 is arranged in the chamber 1301, the ballast water introduced from the ballast water supply line 107 can be stored in the chamber 1301. The killing treatment is performed by the electric killing treatment device 1302 . Thereby, the flow velocity of the ballast water can be made slower than the flow velocity in the ballast water supply line 107, so that the number of times the aquatic organisms in the ballast water come into contact with the electrocidal treatment device 1302 can be increased. The ballast water treatment system of Embodiment 1-5 has the same structure as the ballast water treatment system of Embodiment 1-1 except that the destruction treatment device 1302 is arranged in the chamber 1301 .

For example, ballast water is treated using the ballast water treatment system of Embodiment 1-5 as follows. First, the ballast water taken in from the water intake 104 is introduced into the chamber 1301 through the ballast water supply line 107, and the aquatic organisms in the ballast water are electrically killed in the chamber 1301. Preferably, the electro-killing treatment device 1302 is arranged in a part of the chamber 1301 where the flow velocity is slow, such as near the bottom of the chamber 1301 . When the flow rate becomes slow, the aquatic organisms in the ballast water stay in this part due to the difference in specific gravity between the ballast water and the ballast water, so the number of times the aquatic organisms contact the electro-killing treatment device 1302 can be further increased. Next, the treated liquid is introduced into the ballast water supply line 107 from the chamber 1301 , and is introduced into the ballast tank 103 after the sodium hypochlorite aqueous solution is supplied from the chemical solution supply device 101 .

It is preferable that the discharge port of the chamber 1301 is formed at an upper portion of the chamber 1301 . Thereby, the amount of aquatic biomass in the liquid introduced into the ballast water supply line 107 can be further reduced. It is preferable that the discharge port of the chamber 1301 is formed at a lower position than the introduction port of the chamber 1301 . In addition, it is preferable that the diameter of the discharge port of the chamber 1301 is larger than the diameter of the introduction port. According to these structures, the flow velocity of the ballast water in the chamber 1301 can be made slower than that in the ballast water supply line 107, so that the number of times the aquatic organisms in the ballast water come into contact with the electro-killing treatment device 1302 is further increased. The ratio of the diameter of the discharge port to the diameter of the introduction port (discharge port: introduction port) in the chamber 1301 is not particularly limited, and can be, for example, 1:1.2 to 1.5. In addition, it is preferable that the diameter of the line connected to the discharge port gradually increases from the chamber 1301 to the medical solution supply device 101 . Thereby, an increase in pressure loss can be suppressed.

The chamber 1301 may further include rectifying members such as baffles. Thereby, the flow velocity in the chamber 1301 can be easily fixed. In addition, the rectification member is preferably disposed on the upper part of the electrodestructive treatment device 1302 . According to this structure, more aquatic organisms in the ballast water can be gathered on the side of the electro-killing treatment device 1302, thereby further increasing the number of times of contact with the electro-killing treatment device 1302 to improve the efficiency of killing treatment.

The bottom of the chamber 1301 may also be connected to a line (not shown) with one end connected to an overboard or drain line. Residues, garbage, etc. accumulated in the chamber 1301 and/or the electro-killing treatment device 1302 can be discharged out of the ship through this line.

In the ballast water supply line 107, the part connecting the killing treatment device 102 and the chemical solution supplying device 101 may be a bent part bent into a crank shape as in Embodiments 1-4, or may be a part from the killing treatment device. 102 forms an inclined portion that gradually ascends toward the medical solution supply device 101 . According to these modes, for example, the sodium hypochlorite aqueous solution supplied from the chemical solution supply device 101 can be supplied to the chamber 1301 in which the destruction treatment device 102 is disposed. Thereby, the liquid remaining in the chamber 1301 can be sterilized by sodium hypochlorite.

In Embodiments 1-5, the order of the supply of the aqueous sodium hypochlorite solution and the treatment by the electrodestructive treatment device is not particularly limited to this order, and the aqueous sodium hypochlorite solution may be supplied before the treatment by the electrodestructive treatment device.

(Embodiments 1-6)

14 is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 1-6 of the present invention. In FIG. 14 , the same reference numerals are attached to the same components as those in FIG. 13 .

The ballast water treatment system in Embodiment 1-6 includes a ballast water supply line 107, a chemical solution supply device 101 for supplying an aqueous solution of sodium hypochlorite to the ballast water supply line, The chamber 1301 and the electrical killing treatment device 1302 disposed in the chamber 1301, the liquid medicine supply device 101 has a water intake line 1410 for taking in the liquid used for sodium hypochlorite generation, and the water intake line 1410 is connected to the ballast water supply line. The port 104 is connected, and a water intake pump 116 different from the ballast water intake pump 106 (for example, a ballast pump) is provided. In the ballast water treatment system according to Embodiments 1-6, the chemical solution supply device 101 has a water intake line 1410 connected to the water intake (seawater valve tank) 104, and the water intake line 1310 is equipped with a water intake pump different from the ballast pump 106. 116. Other than that, the structure is the same as that of the ballast water treatment system in Embodiments 1-5.

According to the ballast water treatment system of Embodiment 1-6, since the water intake pump 116 different from the ballast pump 106 is provided, water can be extracted without driving the ballast pump 106 or the like. Therefore, for example, water intake of liquid and generation of sodium hypochlorite can be easily performed even during navigation.

[Second way]

As another aspect, the present invention relates to a ballast water control method (hereinafter also referred to as "the ballast water control method of the present invention"), which includes: In the ballast water treatment system supplied to the ballast water supply line of the ballast tank and the sodium hypochlorite aqueous solution used to sterilize the aquatic microorganisms in the above-mentioned liquid to the chemical solution supply device of the above-mentioned ballast water supply line, to The liquid in the above-mentioned ballast water supply line after supplying a predetermined amount of sodium hypochlorite from the above-mentioned chemical liquid supply device is sampled, and the attenuation of the concentration of sodium hypochlorite in the sample obtained by sampling is measured, and the adjustment from the above-mentioned chemical agent is adjusted based on the measurement data. The supply amount of sodium hypochlorite supplied by the liquid supply device to the above-mentioned ballast water supply line.

The second aspect of the present invention is based on the insight that the degree of attenuation of sodium hypochlorite used to sterilize aquatic microorganisms in ballast water differs depending on the liquid to be treated, that is, the attenuation of sodium hypochlorite is affected by, for example, the concentration in seawater obtained from drawing water. The influence of the type and amount of microorganisms and organic matter. Furthermore, the present invention is based on the insight that if the attenuation of sodium hypochlorite is measured using the liquid obtained by drawing water, and the supply amount of sodium hypochlorite is controlled using the attenuation data, the ballast in the ballast tank after the water injection is completed can be more accurately controlled The sodium hypochlorite concentration of the water.

As mentioned above, since the Ballast Water Management Treaty obliges installation of ballast water treatment equipment, new technology capable of treating ballast water is further sought. Among them, a new technology related to the control of the concentration of sodium hypochlorite in ballast water is particularly expected, because a reducing agent is required for discharge or time for standing is required when excessive sodium hypochlorite is present in ballast water. Therefore, as a second aspect, the present invention provides a new treatment system capable of controlling the sodium hypochlorite concentration of ballast water.

According to the present invention of the second aspect, there is an effect that the sodium hypochlorite concentration of the ballast water in the ballast tank can be controlled while injecting the ballast water. In addition, according to the present invention, it is preferable that the concentration of sodium hypochlorite can be controlled according to the liquid obtained by drawing water. In addition, according to the present invention of the second aspect, there is an effect that it is possible to avoid the situation where sodium hypochlorite is excessive in the ballast tank, and a large amount of reducing agent is used or takes time to be left at the time of drainage.

According to the ballast water control method of the present invention, it is judged whether the supply amount of sodium hypochlorite initially added to the liquid obtained by drawing water as a reference is excessive or insufficient with respect to the target concentration range of the ballast water after water injection while injecting, and the adjustment is made. The supply amount added to the liquid obtained by drawing water has the effect of being able to control the concentration of sodium hypochlorite according to the liquid obtained by drawing water. Therefore, according to the ballast water control method of the present invention, it is possible to avoid the situation where the sodium hypochlorite in the ballast tank is insufficient and the bactericidal effect cannot be exerted, or the situation where the sodium hypochlorite is excessive and requires a large amount of reducing agent or long-term storage during drainage. Effect.

In the second aspect, the "disinfection treatment of aquatic microorganisms" includes sterilizing at least a part of aquatic microorganisms contained in the liquid to be treated and/or ballast water and/or inhibiting the growth of aquatic microorganisms. In addition, in this specification, the "disinfection treatment of aquatic microorganisms" only needs to sterilize at least aquatic microorganisms, and organisms larger than aquatic microorganisms, other organisms, etc. may be sterilized together with the disinfection treatment of aquatic microorganisms. As the sterilizing treatment of aquatic microorganisms, it is preferable to include: the sodium hypochlorite concentration in the ballast tank is managed to meet the ballast water discharge standards shown in the above table 1 when the ballast water is discharged; it is more preferable to include: Disinfection treatment is performed to satisfy the ballast water discharge standards shown in Table 1 above when ballast water is discharged.

In the second aspect, the "chemical solution supply device" refers to a device that supplies an aqueous solution of sodium hypochlorite to the liquid obtained by drawing water and/or ballast water, and may also be a device that generates sodium hypochlorite by electrolysis, or a device that stores sodium hypochlorite or its aqueous solution. Way. Examples of the chemical solution supply device using electrolysis include an embodiment including an electrolytic tank and a storage tank as will be described later. The chemical solution supply device using electrolysis can generate sodium hypochlorite from seawater, so it can sterilize aquatic microorganisms without using, for example, special chemicals such as bactericides brought from outside the ship. Sea water and the like may be supplied to the storage tank from the ballast water supply line via a pump and a valve, or water may be directly taken from outside the ship to supply sea water and the like to the storage tank. From the viewpoint of simply performing water intake during the voyage, it is preferable not to extract water from the ballast water supply line but to extract water directly. In addition, the generated sodium hypochlorite is stored in a storage tank as an aqueous solution, and is supplied to a ballast water supply line through a pump and a valve. It is preferable that the chemical solution supply device is provided with a measuring device capable of measuring the concentration of sodium hypochlorite (hereinafter referred to as "sodium hypochlorite concentration meter" or simply "concentration meter.") and a flow meter so as to be able to grasp the amount of sodium hypochlorite supplied to the ballast water supply line. amount.

In addition, from the viewpoint of improving the treatment efficiency, it is preferable that the chemical solution supply device using electrolysis includes a sodium chloride aqueous solution storage tank and/or a sodium chloride storage tank. By providing the aqueous sodium chloride storage tank and/or the sodium chloride storage tank, the aqueous sodium chloride solution/sodium chloride can be stored in the tank, and the aqueous sodium chloride solution/sodium chloride can be supplied to the electrolytic cell as needed. Thereby, even if it is a ship which takes in ballast water in a freshwater area, sodium hypochlorite can be produced and a disinfection process can be performed using sodium hypochlorite, for example.

In the second aspect, "navigation data" refers to data including navigation time, time until discharge, water quality of water intake port, weather conditions of navigation sea area, and/or information related to these data obtained during navigation.

In the second aspect, "attenuation of sodium hypochlorite" refers to a case where the concentration of sodium hypochlorite in the ballast water supplied with sodium hypochlorite from the chemical solution supply device decreases. An example of the decay curve of sodium hypochlorite is shown in FIG. 20 . The curve of the solid line in FIG. 20 shows the change of the sodium hypochlorite concentration in model seawater. In general, when sodium hypochlorite is dissolved in seawater, a sharp decrease in concentration appears initially (time 0 to time t3). Thereafter, a substantially stable concentration (dx) is exhibited (time t3-).

However, the degree of attenuation of sodium hypochlorite is also affected by the type and amount of microorganisms, organic matter, and/or other water components in the liquid obtained from water extraction. The dotted curve in FIG. 20 is an example of a case where the concentration (dy) at which the actually taken in seawater becomes substantially stable is lower by Δd than the model seawater. In addition, in FIG. 20 , the case where the degree of attenuation in the actually taken in seawater is larger than that in the model seawater has been described, but there are cases where the degree of attenuation in the taken in seawater is smaller than that in the model seawater. Therefore, even if sodium hypochlorite is supplied only according to the expected attenuation (attenuation in model seawater), if there is a concentration difference Δd between the actually taken in seawater to reach a plateau, the concentration of sodium hypochlorite will be insufficient or excessive. .

Therefore, in order to more accurately predict or control the sodium hypochlorite concentration of the ballast water at the completion of the injection of the ballast water, it is important to know the degree of reduction of the sodium hypochlorite in the liquid obtained by drawing water. Therefore, one aspect of the ballast water control method of the present invention includes: while injecting ballast water, simultaneously measuring the attenuation of sodium hypochlorite in the injected ballast water; The supply amount of sodium hypochlorite supplied from the ballast water supply line is adjusted. The adjustment of the above-mentioned supply amount may include: based on the above-mentioned attenuation measurement data, predicting the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, when a predetermined time passes, and/or when the ballast water is discharged; increasing or decreasing the supply amount of sodium hypochlorite supplied to the ballast water supply line by the chemical solution supply device; and controlling the amount of sodium hypochlorite supplied to the ballast water supply line based on the determination.

Specifically, for example, the supply amount from the chemical solution supply device can be adjusted as follows based on the attenuation data of sodium hypochlorite. The attenuation of sodium hypochlorite using model seawater can be measured in advance, so the initial supply amount of sodium hypochlorite to be supplied can be determined based on information such as the model measurement data and the flow rate of the liquid obtained by drawing water. Next, the attenuation is measured using the liquid obtained by drawing water, and compared with the pre-measured model measurement data, for example, Δd in FIG. 20 is calculated. Based on these data, a higher degree of attenuation increases supply, and a lower degree of attenuation decreases supply. By performing such adjustment, the sodium hypochlorite concentration in the ballast tank can be made within the target range.

The attenuation of sodium hypochlorite in the water-drawn liquid can be measured by measuring the concentration of sodium hypochlorite at regular intervals. For example, it is possible to obtain attenuation data by performing measurement at times t1 to t6 shown in FIG. 20 . The measurement interval is, for example, 20 minutes to 1.5 hours, preferably 30 minutes to 1 hour. Since it is necessary to perform attenuation measurement in parallel with water injection into the ballast tank and to adjust the supplied hypochlorous acid concentration as necessary, the number of measurements is preferably within a range in which the attenuation curve can be predicted. Although six measurements of t1 to t6 are illustrated in FIG. 20 , the number of measurements can be reduced as long as the attenuation curve can be predicted.

In one aspect of the ballast water control method of the present invention, the attenuation measurement of sodium hypochlorite is performed by sampling the ballast water in the ballast water supply line after sodium hypochlorite is supplied from the chemical solution supply device. Therefore, the ballast water supply line between the connection point of the chemical solution supply device and the ballast water supply line and the ballast tank is preferable as the sampling point of the sample for attenuation measurement. In addition, it is preferable to perform the above-mentioned sampling and attenuation measurement by an attenuation measurement unit equipped with a concentration meter of sodium hypochlorite. In one embodiment, only one sampling is performed after the water injection starts, based on which the attenuation data of sodium hypochlorite can be obtained to implement the ballast water control method of the present invention. In addition, in other embodiments, multiple sampling can be performed to obtain multiple sodium hypochlorite attenuation data to implement the ballast water control method of the present invention. In the case of performing multiple samplings, one attenuation measurement unit can be used to measure samples alternately, or multiple attenuation measurement units can be used to measure a plurality of samples obtained by sampling simultaneously or with time shifted in parallel.

As another aspect, the present invention relates to a ballast water injection method, the method comprising: using the ballast water control method of the present invention to control the concentration of sodium hypochlorite in the ballast water.

Moreover, this invention relates to the ballast water treatment system which can perform the ballast water control method of this invention, and the ship provided with this ballast water system as another aspect.

That is, as another aspect, the present invention relates to a ballast water treatment system (hereinafter also referred to as "the second ballast water treatment system of the present invention") comprising: a ballast water supply line that The water intake is connected to the ballast tank; the liquid medicine supply device is connected to the above-mentioned ballast water supply line, and the sodium hypochlorite aqueous solution used to sterilize the aquatic microorganisms in the above-mentioned liquid is supplied to the above-mentioned ballast water supply line The attenuation measurement unit is configured between the connection point of the above-mentioned ballast water supply line and the above-mentioned liquid medicine supply device and the ballast tank, and samples the liquid in the above-mentioned ballast water supply line to measure the concentration of sodium hypochlorite; the recording unit, It records the data measured by the attenuation measurement unit; and the control part controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the above-mentioned ballast water supply line through the above-mentioned connection point during the ballast water injection process, wherein the above-mentioned The control unit includes: based on the decay rate data of sodium hypochlorite, predicts the concentration of sodium hypochlorite in the ballast tank when the ballast water injection is completed, when a predetermined time elapses, and/or when the ballast water is discharged, and determines the sodium hypochlorite supplied from the chemical solution supply device. The increase or decrease of the supply amount controls the amount of sodium hypochlorite supplied to the above-mentioned ballast water supply line.

The above-mentioned control unit may further perform the above-mentioned prediction and /or the aforementioned decision. In addition, ballast water may exist in ballast tank water before water injection. Therefore, it is preferable to provide a meter capable of measuring the capacity of ballast water such as a liquid level gauge and a meter capable of measuring the concentration of sodium hypochlorite in the ballast tank in the ballast tank, and to perform the above-mentioned prediction and /or the aforementioned decision.

Next, the present invention will be described in detail by showing preferred embodiments. However, the present invention is not limited to the embodiments shown below.

(Embodiment 2-1)

Fig. 15 is a schematic configuration diagram showing the configuration of a ballast water treatment system in Embodiment 2-1 of the present invention.

As shown in FIG. 15 , the ballast water treatment system according to Embodiment 2-1 includes a chemical solution supply device 101 and an attenuation measurement unit 112 . The chemical solution supply device 101 is connected to a ballast water supply line 107 via lines 108 and 109 . The line 108 is a line for supplying liquid (ballast water) obtained by taking water from the ballast water supply line 107 before adding the sodium hypochlorite aqueous solution to the chemical solution supply device 101 . The line 109 is a line for supplying the sodium hypochlorite aqueous solution from the chemical solution supply device 101 to the ballast water supply line 107 . In addition, liquid (such as seawater) may be directly taken in from the outside through the line 110 instead of sending the liquid obtained from the ballast water supply line 107 to the line 108 of the chemical solution supply device 101 . The lines 108 to 110 may also be provided with pumps for liquid delivery. In addition, it is preferable that the line 109 is equipped with a sodium hypochlorite concentration meter and a flow meter to measure the supply amount of sodium hypochlorite supplied to the ballast water supply line 107, and the flow meter is preferably an integrated flow meter FM capable of measuring the total flow. In addition, in FIG. 15 , the form in which the lines 108 to 110 are each equipped with a pump is shown, but the present invention is not limited to this form. to replace these pumps. In addition, the line 109 may be connected to the sea valve tank 104 instead of the ballast water supply line 107 .

One end of the ballast water supply line 107 is connected to the ballast tank 103 . Usually, the ballast tank 103 is a form including several ballast tanks 103a-103d. The other end of the ballast water supply line 107 is connected to a water intake (seawater valve tank) 104 for taking in ballast water, a strainer 105 , and a ballast pump 106 . In addition, a flow meter (FM), a sodium hypochlorite concentration meter (C) and an attenuation measurement unit 112 are disposed between the ballast tank 103 and the connection point between the common sodium hypochlorite line 109 and the ballast water supply line 107 .

The attenuation measurement unit 112 samples the ballast water from the line 111 after ballast water injection starts, and repeatedly measures the concentration of sodium hypochlorite over time. As described above, by performing the measurement in this way, it is possible to analyze how the sodium hypochlorite in the liquid obtained by drawing water decreases, and to adjust the amount of sodium hypochlorite supplied from the line 109 . In addition, while the attenuation is measured by the attenuation measuring unit 112 , the filling of the ballast water can be continued in parallel without being stopped, and thus time loss can also be prevented.

As the chemical solution supply device 101 using electrolysis, for example, the chemical solution supply device 201 shown in FIG. 16 can be used. FIG. 16 is a schematic configuration diagram showing an example of the configuration of an apparatus capable of sterilizing aquatic microorganisms using electrolysis. As shown in FIG. 16 , the chemical solution supply device 201 includes a storage tank 211 and an electrolytic tank 212 . The storage tank 211 is connected to the electrolytic tank 212 through lines 213 and 214 . The liquid in the storage tank 211 is sent to the electrolytic tank 212 through the line 213, and in the electrolytic tank 212, it is sterilized by electrolytic treatment. Next, the liquid treated by the electrolytic tank 212 is sent to the storage tank 211 through the line 214 . From the viewpoint of generating and storing sodium hypochlorite, it is preferable to circulate between the storage tank 211 and the electrolytic tank 212 through lines 213 and 214 .

In such a chemical solution supply device 201 , since electrolytic treatment is used, aquatic microorganisms in the liquid can be sterilized without using special chemicals such as sterilizers brought from outside the ship, for example. In the electrolytic tank 212, sodium hypochlorite is preferably generated by electrolytically treating sodium chloride contained in the liquid, and aquatic microorganisms in the liquid are sterilized using the generated sodium hypochlorite.

In the liquid medicine supply device 201, the storage tank 211 is a tank for storing untreated and/or treated liquid, and the storage tank 211 is connected to a line 213 for introducing the liquid for electrolysis and a line 214 for discharging the liquid after electrolysis. Connect separately. The storage tank 211 may be connected to the lines 108 , 109 and 110 .

It is preferable that the storage tank 211 is equipped with the concentration meter of sodium hypochlorite. Thus, the concentration of sodium hypochlorite in the storage tank 211 can be managed, and the amount of liquid supplied to the storage tank 211, the amount of liquid sent to the electrolytic tank 212 and/or the ballast water supply line can be adjusted according to the concentration of sodium hypochlorite in the storage tank 211. The treatment of the ballast water in the chemical solution supply device 201 such as the amount of the liquid in 107 is controlled.

In addition, as the chemical solution supply device 101 using electrolysis, the chemical solution supply device 201 shown in A to B of FIG. 2 can also be used.

Preferably, the ballast water treatment system according to Embodiment 2-1 further includes a recording unit for recording the data measured by the attenuation measurement unit, and during the ballast water injection process A control unit that controls the amount of sodium hypochlorite supplied by the water supply line. The control unit can predict the concentration of sodium hypochlorite in the ballast tank when the ballast water injection is completed, when a predetermined time elapses, and/or when the ballast water is discharged, based on the decay rate data of sodium hypochlorite, and determine the sodium hypochlorite to be supplied from the chemical solution supply device. The amount of sodium hypochlorite supplied to the above-mentioned ballast water supply line is controlled by the increase or decrease of the supply amount.

As the attenuation measuring unit, for example, a device as shown in FIG. 21 can be used. In the attenuation measurement unit 112 of FIG. 21 , the sample sampled from the ballast water supply line 107 is injected into the container 701 through the line 111 . From the viewpoint of maintaining the uniformity of the concentration in the container 701 , the attenuation measurement unit 112 includes a drive type stirrer 703 using a motor M. FIG. The sample in the container 701 is periodically measured by a concentration meter C using a pump P through a line 702 .

(Embodiment 2-2)

Fig. 17 is a functional block diagram showing the configuration of a ballast water control system in Embodiment 2-2 of the present invention. Embodiment 2-2 relates to a ballast water control system applicable to the ballast water treatment system shown in FIG. 15 . That is, the ballast water control system 170 of FIG. 17 is equipped with: a measurement unit 171, which includes the attenuation measurement unit 112; a recording unit 172, which records the attenuation rate data of sodium hypochlorite measured by the measurement unit 171; and a control unit 173, which is based on The amount of sodium hypochlorite supplied to the ballast water supply line 107 is controlled by determining the increase or decrease of the supply amount of sodium hypochlorite supplied from the chemical solution supply device 101 based on the attenuation speed data of the recording unit 172 . In addition, the ballast water control system 170 of FIG. 17 may be included in the ballast water treatment system of this Embodiment 2-1 shown in FIG. 15 as a structural part.

The measuring unit 171 may also be configured as shown in the measuring unit 181 of FIG. 18 . That is, in addition to the attenuation measurement unit 112, the measurement unit 181 may also include a flow meter (FM) and a sodium hypochlorite concentration meter (C) arranged on the ballast water supply line 107, and the storage tank 211 of the chemical solution supply device 101. Sodium hypochlorite concentration meter. These pieces of information can be recorded in the recording unit 172 .

The recording unit 172 can record data as shown in the recording unit 182 of FIG. 18 . That is, the attenuation speed data measured by the measurement unit 181, the flow rate of ballast water, the concentration of sodium hypochlorite, and the concentration of sodium hypochlorite in the storage tank may be included, and the elapsed time from the start of ballast water injection and navigation data (preferably including at least the time until drainage). The recording unit 182 can also record in advance the range of sodium hypochlorite concentration that should be maintained in the ballast tank.

The control unit 173 can be configured as shown in the control unit 183 of FIG. 18 . That is, it may include an analysis unit 1811 that predicts the pressure when ballast water injection is completed, when a predetermined time has elapsed, and/or when ballast water is discharged based on the data recorded in the recording unit 182 , and a supply amount control unit 1812 . The concentration of sodium hypochlorite in the loading tank 103, the supply amount control unit 1812 determines the increase or decrease of the supply amount of sodium hypochlorite supplied from the chemical solution supply device 101 based on the result of the analysis unit 1811, and the amount of sodium hypochlorite supplied to the ballast water supply line 107 Take control.

An example of the ballast water control method and the ballast water injection method of the present invention will be described using FIG. 19 . As shown in FIG. 19, first, the ballast pump 106 is activated (S501). Thus, intake of liquid through the sea valve tank 104 starts. In addition, when the chemical solution supply device 101 is a device using electrolysis, generation of sodium hypochlorite is started (S502). By starting the ballast pump 106 (S501), the liquid obtained by water extraction is sent to the ballast water supply line 107, and water injection into the ballast tank 103 is started (S503). The flow rate of ballast water, water injection start time, cumulative water injection amount, hypochlorous acid concentration, etc. are measured by a flow meter (FM) and a concentration meter (C) arranged on the ballast water supply line 107 . These pieces of information can be stored in the recording unit 182 . When water injection into the ballast water supply line 107 is started, an initially set amount of sodium hypochlorite aqueous solution is supplied to the ballast water supply line 107 from the chemical solution supply device 101 through the line 109 (S504). It can be preset based on the concentration range of sodium hypochlorite in the ballast water in the ballast tank 103 after water injection, the concentration of the sodium hypochlorite aqueous solution stored in the chemical solution supply device 101 (or storage tank 211), and the attenuation data of sodium hypochlorite obtained in advance. Set the initial setting amount. This initial setting amount can be stored in the recording unit 182 , and the supply amount control unit 1812 of the control unit 183 may control the supply amount based on this information. In addition, from the viewpoint of drainage cost and drainage time, it is preferable to set the initial setting amount to be equal to or less than a predetermined concentration that can be discharged when the ship arrives at the destination and discharges ballast water (time tx in FIG. 20 ).

Next, the ballast water supplied with sodium hypochlorite is sampled from the line 111, and the concentration of sodium hypochlorite is repeatedly measured by the attenuation measuring unit 112 to obtain attenuation data (S505). Sampling can be performed, for example, within 0 to 1 hour after ballast water injection starts, and the concentration measurement of sodium hypochlorite in the attenuation measurement unit 112 can be performed within a range of, for example, 1 to 10 measurements every 30 minutes to 1 hour. The attenuation data in the liquid obtained in this way is stored in the recording unit 182 . In addition, during the measurement of the attenuation data in the attenuation measurement unit 112 , it is also possible to continue the ballast water injection without stopping. The analysis part 1811 of the control part 183 accesses the recording part 182, and judges whether the quantity of the sodium hypochlorite currently supplied is appropriate (S506). In addition, the analysis unit 1811 can access the recording unit 182 at any time, and make a judgment at a time when the decay curve of the liquid obtained by drawing water can be predicted. If the concentration of sodium hypochlorite is too high, it will cause damage and deterioration of piping (lines) and ballast tanks, and a reducing agent and standing time will be required for discharge. On the other hand, if the concentration of sodium hypochlorite is too low, the sterilizing treatment of aquatic microorganisms will be insufficient. When it is determined that the supply amount of sodium hypochlorite needs to be corrected, the supply amount control unit 1812 of the control unit 183 corrects the amount supplied from the chemical solution supply device 101 (or storage tank 211 ) (S507). On the other hand, when it is not necessary to correct the supply amount of sodium hypochlorite, the injection of ballast water is continued as it is (S508). Sampling and attenuation data can be made either once or multiple times. In addition, the number of times of the judgment (S506) of whether it is necessary to correct the sodium hypochlorite supply amount based on the attenuation data may be one time or multiple times. These can be judged from the time required for the injection of ballast water and the total amount of injected ballast water (S509). Finally, the ballast water is injected until the target volume is reached (S510), and the injection of the ballast water is completed.

(Embodiment 2-3)

Fig. 22 is a schematic configuration diagram showing the configuration of a ballast water treatment system in Embodiment 2-3 of the present invention. In FIG. 22 , the same reference numerals are attached to the same components as those in FIG. 15 .

In Embodiment 2-3, the chemical solution supply device 801 is connected to a second water intake 804 different from the water intake 104 to which the ballast water supply line 107 is connected. That is, the chemical solution supply device 801 of the present embodiment 2-3 is not connected to a line capable of taking in liquid obtained by taking in water from the water intake (sea valve tank) 104 for taking in ballast water, but is connected to the second The water intake 804 is connected, and the configuration is the same as that of the ballast water treatment system of Embodiment 2-1. In this way, according to the ballast water treatment system in Embodiment 2-3, in the chemical solution supply device 801, the liquid obtained by taking in water from the water intake (sea valve tank) 104 for taking in ballast water (adding an aqueous solution of sodium hypochlorite) is not used. Sodium hypochlorite is generated by using the liquid obtained from the second water intake 804, so compared with the water intake 104 that takes in ballast water, for example, the liquid can be easily taken in with low power. Therefore, sodium hypochlorite can be generated by the chemical solution supply device 801 during the voyage by taking in the liquid for generating sodium hypochlorite from the outside during the voyage, and the power consumption when storing ballast water in the ballast tank 103 can be reduced, for example. Moreover, the supply of the sodium hypochlorite aqueous solution to the ballast tank 103 becomes easy during a voyage, and the regrowth of the aquatic microorganism in the ballast tank 103 can be suppressed. The line 810 may include, for example, a pump 806 for sending the liquid taken in from the second water inlet 804 to the medical solution supply device 801 . In addition, the line 810 may include a strainer 805 for protecting the chemical solution supply device 801 .

[Third way]

Therefore, as a third aspect, the present invention relates to a ballast water treatment system (hereinafter also referred to as "the third ballast water treatment system of the present invention") comprising: a ballast water supply line, It connects the water intake with the ballast tank; and the liquid medicine supply device, which is connected with the above-mentioned ballast water supply line, will be used to sterilize the aquatic microorganisms in the liquid taken in from the above-mentioned water intake. The sodium hypochlorite aqueous solution supply to the above-mentioned ballast water supply line, wherein the above-mentioned chemical solution supply device is connected to a second water intake different from the water intake connected to the above-mentioned ballast water supply line, and the liquid taken in from the above-mentioned second water intake is electrolysis to produce sodium hypochlorite.

The third ballast water treatment system of the present invention is based on the knowledge that it is possible to simply and efficiently take in water from the chemical solution supply device by taking in water from a water intake different from the water intake (seawater valve tank) from which ballast water is taken in. Low electricity generates sodium hypochlorite. In addition, the third ballast water treatment system of the present invention is based on the knowledge that, when a ship is moored at a port, there are water intake and discharge of ballast water, loading and unloading of cargo, and the most electric power is used. Taking in liquid used for generating sodium hypochlorite and generating sodium hypochlorite during the voyage can disperse the peak power consumption and reduce the capacity of the generator mounted on the ship.

According to the third ballast water treatment system of the present invention, for example, the chemical solution supply device is connected to the second water intake different from the water intake connected to the ballast water supply line, so that the generation of sodium hypochlorite can be easily taken in. The effect of the liquid used in . Therefore, according to the third ballast water treatment system of the present invention, water can be taken in without driving the seawater valve tank, so for example, the liquid used in the generation of sodium hypochlorite can be easily taken in during the voyage, and it can also be used with low power. The effect of taking this water is carried out.

In the third mode, "a second water intake different from the water intake to which the ballast water supply line is connected" refers to a water intake other than a water intake (such as a seawater valve tank) for taking in liquid to be stored in a ballast tank. As the water intake, for example, existing water intakes for drinking water and the like on ships may be mentioned.

The third ballast water treatment system of the present invention may include a control unit that controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line. Preferably, the control unit in the third aspect controls intake of liquid from the second water intake and generation of sodium hypochlorite based on the amount of sodium hypochlorite in the chemical solution supply device and/or the concentration of sodium hypochlorite in the ballast tank.

As another aspect, the present invention relates to a ballast water treatment method, which is a method of treating ballast water in a ship, the ship is provided with a ballast water supply line and a chemical solution supply device, and the ballast water supply line The water intake is connected to the ballast tank, the liquid medicine supply device is connected to the above-mentioned ballast water supply line, and is used to sterilize the aquatic microorganisms in the liquid taken in from the above-mentioned water intake to the above-mentioned ballast water supply line. Treated sodium hypochlorite aqueous solution, the method includes: in the above-mentioned liquid medicine supply device, electrolyzing the liquid taken in from the second water intake different from the water intake connected to the above-mentioned ballast water supply line to generate sodium hypochlorite; and from the above-mentioned The chemical solution supply device supplies the sodium hypochlorite to the ballast water supply line.

It is preferable to perform the electrolytic treatment in the chemical liquid supply device during the voyage. Thereby, the power consumption at the time of injecting ballast water into a ballast tank can be reduced. In addition, by generating and storing sodium hypochlorite during the voyage, it is possible to supply sodium hypochlorite from the start of ballast water filling, and thus time loss can be prevented.

As another aspect, the present invention relates to a manufacturing method, which is a method of manufacturing sodium hypochlorite for sterilizing aquatic microorganisms in ballast water in a ship provided with a ballast water supply line and a chemical solution supply device. The ballast water supply line connects the water intake to the ballast tank, and the chemical liquid supply device is connected to the ballast water supply line, and supplies the chemical solution to the ballast water supply line for treating the liquid taken in from the water intake. A sodium hypochlorite aqueous solution for sterilizing aquatic microorganisms, the method includes: in the above-mentioned chemical liquid supply device, electrolyzing the liquid taken in from the second water intake different from the water intake connected to the ballast water supply line to generate sodium hypochlorite. According to the production method of the present invention, for example, the liquid medicine supply device can easily take in the liquid used in the generation of sodium hypochlorite from the second water intake different from the water intake connected to the ballast water supply line, so it can easily Produces the effect of sodium hypochlorite.

It is preferred that the electrolysis of the aforementioned liquid is carried out during the voyage. Thereby, power consumption at the time of ballast water injection can be reduced.

(Embodiment 3-1)

Fig. 23 is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 3-1 of the present invention. In FIG. 23 , the same components as those in FIG. 15 are assigned the same symbols.

The ballast water treatment system of Embodiment 3-1 does not include the attenuation measurement unit 112 and the line 111 for sampling from the ballast water supply line 107 to the attenuation measurement unit 112, and is similar to the ballast water treatment system of Embodiment 2-3 except that The structure of the water treatment system is the same.

An example of the ballast water treatment method using the ballast water treatment system of Embodiment 3-1 will be described.

During the voyage, the liquid used for generating sodium hypochlorite is taken in from outside the ship through the line 810 from the second water intake 804 before and/or when the ballast water is taken in, and sodium hypochlorite is produced by electrolysis. According to the ballast water treatment system of Embodiment 3-1, the line 810 for taking in the liquid used in the generation of sodium hypochlorite is connected to the second water intake 804 different from the ballast water intake 104, so it is not necessary to drive the ballast pump 106 just can take in liquid. In addition, in a ship, during a berthing period such as when storing ballast water, there is cargo loading and unloading work, and the most power is used. Therefore, from the viewpoint of reducing the capacity of the generator by dispersing the peak power consumption, It is preferable to take in liquid used for generating sodium hypochlorite and generate sodium hypochlorite during the voyage and to store it in advance.

To take in ballast water, the ballast pump 106 is activated. Thereby, intake of liquid through the sea valve tank 104 starts, and water injection into the ballast tank 103 through the ballast water supply line 107 starts. When water injection into the ballast water supply line 107 is started, the sodium hypochlorite aqueous solution stored in the chemical solution supply device 801 is supplied to the ballast water supply line 107 through the line 109 . According to the ballast water treatment system of the present embodiment 3-1, the sodium hypochlorite produced in advance before taking in the ballast water can be stored, so the sodium hypochlorite aqueous solution can be supplied to the ballast water supply line at the same time as the water injection into the ballast tank 103 is started. 107.

The supply amount of the sodium hypochlorite aqueous solution can be determined in advance based on the amount of ballast water injected into the ballast tank 103 , the concentration of the sodium hypochlorite aqueous solution stored in the chemical solution supply device 801 (or the storage tank 211 ), and the like. In addition, the supply amount of the sodium hypochlorite aqueous solution may be controlled in a control unit (not shown) based on the measured values of the flow meter (FM) and the sodium hypochlorite concentration meter (C) arranged on the ballast water supply line 107 .

[the fourth way]

As a fourth aspect, the present invention relates to a ballast water treatment system comprising: a ballast water supply line connecting a water intake to a ballast tank; On the water supply line, it is used to kill the aquatic organisms in the liquid taken in from the above-mentioned water intake; The sodium hypochlorite aqueous solution that kills the aquatic organisms in the taken liquid is supplied to the above-mentioned ballast water supply line, which is composed of an electrolytic treatment device, a centrifugal solid-liquid separation device, and a device that uses water pressure to generate shock waves for treatment. Select the above-mentioned killing treatment device in the group. According to the ballast water treatment system of the fourth aspect, since the killing treatment is performed by the above-mentioned killing treatment device and the killing treatment is performed by sodium hypochlorite, ballast water can be efficiently treated. In the ballast water treatment system of the fourth aspect, the chemical solution supply device, the electrolytic treatment device, the ballast water supply line, and the like are the same as those of the first to third aspects described above.

In the ballast water treatment system of the fourth aspect, it is preferable that the chemical solution supply device is connected to the ballast pump. Thereby, it is possible to take in the liquid for producing the sodium hypochlorite aqueous solution simultaneously with taking in the ballast water, and it is possible to improve the treatment efficiency.

(Embodiment 4-1)

Fig. 24 is a schematic configuration diagram showing the configuration of the ballast water treatment system in Embodiment 4-1 of the present invention. In FIG. 24 , the same reference numerals are attached to the same constituent elements as in FIG. 1 .

In the ballast water treatment system of Embodiment 4-1, the liquid medicine supply device 101 is connected to the ballast pump 106 via the line 110, and the killing treatment device is the electrolytic treatment device 202, except that it is the same as that of Embodiment 1-1. The structure of the ballast water treatment system is the same. From the viewpoint of preventing excess air from being introduced into the ballast tank 103, the chemical solution supply line 109 may include a degassing tank (not shown) for removing gas contained in the sodium hypochlorite aqueous solution.

An example of the ballast water treatment method using the ballast water treatment system of Embodiment 4-1 will be described.

During berthing, the ballast pump 106 is activated to take in ballast water. Thereby, intake of liquid through the sea valve tank 104 is started, and water injection into the ballast tank 103 through the ballast water supply line 107 is started. At this time, the liquid used for generating sodium hypochlorite is taken into the chemical solution supply device 101 through the line 110 together with the intake of ballast water, and sodium hypochlorite is generated by electrolysis. According to the ballast water treatment system of Embodiment 4-1, the line 110 for taking in the liquid used in the generation of sodium hypochlorite is connected to the ballast pump 106, so it can be used for taking in the generation of sodium hypochlorite when taking in ballast water. of liquid. The liquid used for generating sodium hypochlorite can be taken in without driving a pump other than the ballast pump 106 .

Next, in the electrolytic treatment device 2020 , the liquid taken in through the seawater valve box 104 is subjected to killing treatment. The liquid after the killing treatment is supplied to the ballast tank 103 through the ballast water supply line 107 after the sodium hypochlorite aqueous solution generated by the chemical liquid supply device 101 is supplied through the chemical liquid supply line 109 . In this manner, ballast water can be efficiently treated to a level that satisfies ballast water discharge standards by performing killing treatment with electrolytic treatment and killing treatment with sodium hypochlorite. In addition, since the ballast water stored in the ballast tank 103 contains sodium hypochlorite, the killing effect is maintained even during the voyage, thereby suppressing the proliferation of aquatic organisms.

In addition, in Embodiment 4-1, the mode in which the chemical liquid supply line 109 is connected to the ballast water supply line 107 to supply the sodium hypochlorite aqueous solution to the liquid after the killing treatment by the electrolytic treatment device 202 has been described as an example, However, it is not limited to this. For example, the chemical liquid supply line 109 may be connected to the ballast water supply line 107 in such a way that the sodium hypochlorite aqueous solution is supplied before the treatment by the electrolytic treatment device 202, or may be connected before and after the treatment by the electrolytic treatment device 202. The chemical solution supply line 109 and the ballast water supply line 107 are connected so that the sodium hypochlorite aqueous solution is supplied to both.

Industrial availability

The invention is useful in the treatment of ballast water in ships.

Furthermore, in addition to this, the present invention may relate to any of the following.

<1> A control method for ballast water, comprising:

In a medicine that is equipped with a ballast water supply line for supplying the liquid taken in from the water intake to the ballast tank and a sodium hypochlorite aqueous solution for sterilizing aquatic microorganisms in the liquid to the ballast water supply line In the ballast water treatment system of the liquid supply device,

Sampling the liquid in the above-mentioned ballast water supply line after supplying a predetermined amount of sodium hypochlorite from the above-mentioned chemical liquid supply device, measuring the attenuation of the concentration of sodium hypochlorite in the sample obtained by sampling, and adjusting the flow rate from the above-mentioned chemical solution based on the measurement data. The supply amount of sodium hypochlorite supplied by the liquid supply device to the above-mentioned ballast water supply line;

<2> According to the method for controlling ballast water described in <1>,

The adjustment of the above-mentioned supply includes: based on the attenuation measurement data of sodium hypochlorite in the liquid obtained by taking water, predicting the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, when the specified time passes, and/or when the ballast water is discharged; Determine the increase or decrease in the amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line based on the prediction; and control the amount of sodium hypochlorite supplied to the ballast water supply line based on the above determination;

<3> The ballast water control method according to <1> or <2>,

The above sampling and attenuation measurements are carried out by an attenuation measurement unit with a concentration meter of sodium hypochlorite;

<4> A water injection method for ballast water, comprising:

Control by the control method described in any one of <1> to <3>;

<5> A ballast water treatment system with:

Ballast water supply lines, which connect the water intakes to the ballast tanks;

A liquid medicine supply device, which is connected to the above-mentioned ballast water supply line, and supplies the sodium hypochlorite aqueous solution for sterilizing the aquatic microorganisms in the liquid taken in from the above-mentioned water intake to the above-mentioned ballast water supply line;

An attenuation measurement unit, which is arranged between the ballast tank and the connection point between the above-mentioned ballast water supply line and the above-mentioned liquid medicine supply device, samples the liquid in the above-mentioned ballast water supply line to measure the concentration of sodium hypochlorite;

a recording section that records data measured by the attenuation measurement unit; and

a control unit that controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line via the connection point during the ballast water injection process,

Wherein, the above-mentioned control unit includes: predicting the concentration of sodium hypochlorite in the ballast tank when the ballast water injection is completed, when a predetermined time passes, and/or when the ballast water is discharged, based on the decay rate data of sodium hypochlorite, and determines the concentration of sodium hypochlorite to be supplied from the chemical solution supply device. The amount of sodium hypochlorite supplied to the above-mentioned ballast water supply line is controlled by increasing or decreasing the supply of sodium hypochlorite;

<6> The ballast water treatment system according to <5>,

The control unit further performs the prediction based on at least one of the cumulative injection amount of ballast water, the cumulative supply amount of sodium hypochlorite, navigation data, and a predetermined concentration of sodium hypochlorite to be maintained in the ballast tank at a time point before the control, and/or the above decision;

<7> The ballast water treatment system according to <5> or <6>,

The liquid medicine supply device is connected to a second water intake different from the water intake connected to the ballast water supply line, and uses the liquid taken in from the second water intake to generate sodium hypochlorite;

<8> A ship provided with the ballast water treatment system according to any one of <5> to <7>.

Claims (7)

1. A control method for ballast water, comprising: In a medicine that is equipped with a ballast water supply line for supplying the liquid taken in from the water intake to the ballast tank and a sodium hypochlorite aqueous solution for sterilizing aquatic microorganisms in the liquid to the ballast water supply line In the ballast water treatment system of the liquid supply device, Sampling the liquid in the above-mentioned ballast water supply line after supplying a predetermined amount of sodium hypochlorite from the above-mentioned chemical liquid supply device, and measuring the concentration of sodium hypochlorite in the sampled sample at a predetermined time interval The concentration of sodium hypochlorite in the tank is measured with respect to the decay of time, and based on the measurement data, the supply amount of sodium hypochlorite supplied from the above-mentioned liquid medicine supply device to the above-mentioned ballast water supply line is adjusted, wherein the above-mentioned prescribed time interval is 20 minutes to 1.5 minutes. Hour. 2. The control method of ballast water according to claim 1, characterized in that, The adjustment of the above-mentioned supply includes: based on the attenuation measurement data of sodium hypochlorite in the liquid obtained by taking water, predicting the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, when the specified time passes, and/or when the ballast water is discharged; Based on the prediction, an increase or decrease in the supply amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line is determined; and based on the determination, the amount of sodium hypochlorite supplied to the ballast water supply line is controlled. 3. The method for controlling ballast water according to claim 1 or 2, characterized in that, The above-mentioned sampling and attenuation measurement are performed by an attenuation measurement unit equipped with a concentration meter of sodium hypochlorite. 4. A water injection method for ballast water, comprising: Control is performed by the control method according to any one of claims 1-3. 5. A ballast water treatment system, comprising: Ballast water supply lines, which connect the water intakes to the ballast tanks; A liquid medicine supply device, which is connected to the above-mentioned ballast water supply line, and supplies the sodium hypochlorite aqueous solution for sterilizing the aquatic microorganisms in the liquid taken in from the above-mentioned water intake to the above-mentioned ballast water supply line; an attenuation measurement unit arranged between the ballast tank and the connection point between the ballast water supply line and the chemical solution supply device, and samples the liquid in the ballast water supply line, and measures the sampled value at predetermined time intervals. The concentration of sodium hypochlorite in the sample obtained measures the decay of the sodium hypochlorite concentration in the sample obtained by sampling relative to time, wherein the above-mentioned specified time interval is 20 minutes to 1.5 hours; a recording section that records data measured by the attenuation measurement unit; and a control unit that controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line via the connection point during the ballast water injection process, Wherein, the above-mentioned control unit includes: predicting the concentration of sodium hypochlorite in the ballast tank when the ballast water injection is completed, when a predetermined time passes, and/or when the ballast water is discharged, based on the decay rate data of sodium hypochlorite, and determines the concentration of sodium hypochlorite to be supplied from the chemical solution supply device. The amount of sodium hypochlorite supplied to the above-mentioned ballast water supply line is controlled by increasing or decreasing the supply amount of sodium hypochlorite. 6. The ballast water treatment system of claim 5, wherein: The control unit further performs the prediction based on at least one of the cumulative injection amount of ballast water, the cumulative supply amount of sodium hypochlorite, navigation data, and a predetermined concentration of sodium hypochlorite to be maintained in the ballast tank at a time point before the control, and/or above decision. A ship provided with the ballast water treatment system according to claim 5 or 6.