JP7457400B2 - Chlorine concentration control method, cleaning system for water treatment device, program, and water circulation type water treatment device - Google Patents

Description

This disclosure relates to a method for controlling chlorine concentration, a cleaning system for a water treatment device, a program, and a water circulation type water treatment device.

Patent Document 1 describes a water treatment method for producing soft water of good quality with low salt concentration, no problem of scale or water mark formation due to metal components or silica components in water, and suppressed slime generation. Disclosed.

Furthermore, Patent Document 2 discloses a technique for stably producing a hypochlorous acid solution by electrolyzing concentrated water obtained by salt removal treatment regarding organic wastewater containing salts and organic substances. has been done.

Furthermore, in Patent Document 3, in an RO membrane treatment system equipped with an energy recovery device that recovers energy from concentrated water of the RO membrane device, not only biofouling of the RO membrane device but also biofouling in the energy recovery device is detected. In order to improve the energy efficiency of the entire system and ensure stable operation, the residual halogen concentration in the concentrated water of the RO membrane device introduced into the energy recovery device is 0.1 to 10,000 mg/L in terms of total chlorine concentration. A technique has been disclosed in which at least one of a bound chlorine-based slime control agent and a stabilized bromine-based slime control agent is added to RO feed water so as to achieve the following.

Japanese Patent Application Publication No. 2011-072864 Japanese Patent Application Publication No. 2014-014738 International Publication No. 2016/158633

By the way, in water treatment plants that purify water that has been used once and reuse that water, chlorine is often used to clean the inside of the water treatment plant.

However, to achieve a sufficient cleaning effect, large amounts of chlorine and water are required, and as a result, after the internal cleaning of the water treatment device, a large amount of cleaning wastewater needs to be treated, which places a burden on the user in terms of maintenance. For example, portable water treatment devices are often installed in places where it is difficult to supply and drain water, which creates an issue in that it is difficult to prepare large amounts of chlorine water for internal cleaning of the water treatment device and to discard the generated wastewater. In addition, when using chlorine water to clean the inside of the water treatment device, another issue arises in that the chlorine concentration of the chlorine water needs to be adjusted to an appropriate concentration.

The present disclosure has been made in view of the above circumstances, and provides a chlorine concentration control method and a water treatment device that can control the chlorine concentration of chlorine water to a desired concentration when cleaning the inside of the water treatment device. The Company provides cleaning systems, programs, and water circulation type water treatment equipment.

A first aspect of the present disclosure provides a water circulation flow path including a flow path through which chlorinated water flows and a filter that does not allow hypochlorous acid to pass therethrough, by cross-flowing the chlorinated water to the filter. This is a chlorine concentration control method for controlling the chlorine concentration of chlorine water circulating in a circulation channel to a desired concentration.

According to the present disclosure, it is possible to control the chlorine concentration of chlorine water to a desired concentration when cleaning the inside of a water treatment device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a schematic configuration of a water treatment system according to an embodiment. FIG. 2 is a schematic block diagram of a computer that functions as a control device. FIG. 2 is a diagram for explaining a process executed by a control device.

Hereinafter, embodiments will be described in detail with reference to the drawings.

<Water treatment system of embodiment>
FIG. 1 is a diagram showing a water treatment system 10 of this embodiment. As shown in FIG. 1, the water treatment system 10 of the present embodiment includes a faucet 12 that discharges wash water, a sink 14, an intermediate tank T1 that is an example of a first tank, and an example of a second tank. A chlorinated water tank T2, a water storage tank T3, a drainage tank T4, an RO (Reverse Osmosis Membrane) filter 16, a first pump P1, a second pump P2, a third pump P3, and a temperature sensor 18. A control device 20 is provided. Further, as shown in FIG. 1, the water treatment system 10 includes channels C1, C2, C3, C4, C5, C6, C7, C8, and Cx through which water flows, and a three-way valve 22. . Note that the configuration of the water treatment system 10 is not limited to that shown in FIG. 1. FIG. 1 is for explaining a water treatment system 10 that is an embodiment, and the arrangement and configuration of various components such as pumps, tanks, sensors, filters, and flow paths are limited to those shown in FIG. 1. isn't it. Note that part or all of the water treatment system 10 is an example of a water treatment device, a cleaning system, and a water circulation type water treatment device.

The temperature sensor 18 and the control device 20 are electrically connected, and the control device 20 acquires the signal output from the temperature sensor 18. Further, each of the first pump P1, the second pump P2, and the third pump P3 is electrically connected to the control device 20, and the control device 20 is connected to the first pump P1, the second pump P2, and the third pump P3. Controls the drive of pump P3.

For example, if the water treatment system 10 is portable, it can be installed at any location, so it can be installed at various locations such as indoors and outdoors. For example, the water treatment system 10 is installed in a hand washing device as disclosed in Japanese Patent Application Publication No. 2022-014999. Note that the water treatment system 10 does not need to be portable. Examples of installations where the water treatment system 10 is not portable include cases where it is installed on a moving object such as a vehicle, or cases where it is installed at an arbitrary location by a user. For example, when the water treatment system 10 is installed in a moving body such as a vehicle, the water treatment system 10 may be installed as a hand wash, shower, or kitchenette in a camper, sleeper train, airplane, passenger ship, etc. . Examples of cases in which the water treatment system 10 is installed at any location include hand washing, washing, showering, bathrooms, kitchens, etc. in container houses, camping facilities, villas, mountain huts, or outdoor facilities such as golf courses. The water treatment system 10 may be installed in places where water is used, such as laundry, toilets, or swimming pools (hereinafter collectively referred to as "showers, etc.").

The faucet 12 discharges wash water. Note that the washing water discharged from the faucet 12 is used by the user for hand washing and the like.

The sink 14 receives water utilized by the user. A drain port (not shown) is formed at the bottom of the sink 14 for draining water discharged into the tank. Water W1 discharged from the drain port of the sink 14 passes through the channel C1 and is stored in the intermediate tank T1.

The intermediate tank T1 stores water used by the user.

Chlorine water is stored in the chlorine water tank T2. In this embodiment, an aqueous solution containing free chlorine such as sodium hypochlorite, calcium hypochlorite, and chlorinated isocyanuric acid is referred to as chlorine water.

Water that has passed through the RO filter 16 is stored in the water storage tank T3. The water stored in the water storage tank T3 is water that is reused as washing water. The water stored in the water storage tank T3 passes through the channel Cx, undergoes various treatments, and then is discharged from the faucet 12 as wash water.

Concentrated wastewater containing a high concentration of pollutants that have not passed through the RO filter 16 is stored in the wastewater tank T4. The water stored in the drain tank T4 is discarded without being reused.

The RO filter 16 is for purifying water. Furthermore, the concentration of hypochlorous acid in the water that has passed through the RO filter 16 is reduced. Note that, in principle, the RO filter 16 does not allow hypochlorous acid to pass therethrough. However, a very small amount of hypochlorous acid may pass through the RO filter 16. Note that, hereinafter, not allowing the entire amount of chlorine water to pass through the RO filter 16, but allowing a portion of the chlorine water to flow out parallel to the membrane surface of the RO filter will be simply referred to as "cross flow."

In addition, in this embodiment, an example will be explained in which the filter that does not allow hypochlorous acid to pass through is an RO filter, but the filter is not limited to this, and may be a filter that has the function of not allowing hypochlorous acid to pass through. Any filter may be used. Note that a valve B is provided in the outlet flow path of the RO filter 16. By opening and closing the valve B, water that has passed through the RO filter 16 flows into either the flow path C8 or the flow path C9.

The operation of the first pump P1, the second pump P2, and the third pump P3 is controlled by the control device 20 described below.

Specifically, as shown in FIG. 1, when the first pump P1 is driven, water W2 stored in the intermediate tank T1 is pumped up and flows through the flow path C2 and the flow path C3. The water used by the user is purified by the water W2 passing through the RO filter 16.

As shown in FIG. 1, when the second pump P2 is driven, the chlorine water W3 in the chlorine water tank T2 is pumped up and supplied to the inlet side of the filter 16 by flowing through the flow path C3. At this time, the water W2 flowing through the flow path C3 and the filtration surface on the inlet side of the filter 16 are sterilized and purified by the chlorine water W3.

Further, as shown in FIG. 1, when the third pump P3 is driven, the chlorine water W4, W5 in the chlorine water tank T2 is pumped up and flows through the flow path C4 and the flow path C5, so that the RO filter 16 Chlorinated water W4 is supplied to the outflow side of the filter 16 to sterilize and purify the outflow side of the filter 16, and chlorinated water W5 in the chlorinated water tank T2 is also supplied to the water storage tank T3, where it is made available to the user as purified water.

As shown in FIG. 1, part of the water W2 and chlorinated water W3 flowing through the flow path C3 passes through the RO filter 16 and becomes water W6 flowing through the flow path C6, and water W7 flowing through the flow path C7. , is stored in the water storage tank T3.

Meanwhile, water W8 containing hypochlorous acid that did not pass through the RO filter 16 circulates through flow path C8, and by cross-flowing the RO filter 16 again, the concentration of hypochlorous acid becomes high in the circulation flow path. Note that the circulation flow path also includes each component of the water treatment system 10, such as the flow paths that make up the circulation flow path (not shown), various tanks, filters, pumps, and valves.

Further, as shown in FIG. 1, the highly concentrated chlorine water W9 may flow through the channel C9 and be discharged to the drainage tank T4, or the purified water stored in the water storage tank may be The concentration of chlorine water in the circulation channel may be diluted by supplying it to the faucet 12 through the channel Cx.

The temperature sensor 18 is installed inside the water treatment system 10 and continuously detects the temperature of the surrounding area where the chlorine water tank T2 is located. The temperature sensor 18 may also directly detect the temperature inside the chlorine water tank T2.

The control device 20 controls the amount, pressure, circulation speed, and circulation interval of water circulating within the water treatment system 10, as well as the amount and concentration of chlorine water supplied to the RO filter 16, the circulation flow path, and each of the tanks T1 and T3.

The chlorine concentration of the chlorine water changes depending on the surrounding temperature. Specifically, the higher the temperature, the lower the chlorine concentration of the chlorine water, and the lower the temperature, the more the initial chlorine concentration of the chlorine water is maintained. The chlorine concentration of the chlorine water stored in the chlorine water tank T2 also changes depending on the surrounding temperature. For this reason, even if control is predetermined to supply a fixed amount of chlorine water to the RO filter 16, the circulation flow path, and each of the tanks T1 and T3 each time, the chlorine concentration of the chlorine water changes depending on the temperature, and so the water may not be sufficiently purified.

Therefore, the control device 20 of the water treatment system 10 of the present embodiment estimates the chlorine concentration of the chlorinated water in the chlorinated water tank T2 based on the cumulative change in temperature detected over time by the temperature sensor 18, The amount of chlorine water to be supplied to the RO filter 16 and water storage tank T3 is determined according to the estimated chlorine concentration. Then, the control device 20 controls the second pump P2 and the third pump P3 so that the determined amount of chlorine water is supplied to the RO filter 16 and the water storage tank T3. As a method for determining and controlling the amount of chlorine water to be supplied to the RO filter 16 and the water storage tank T3 by the control device 20, for example, the method disclosed in Japanese Patent No. 7092425 can be used.

Chlorine water can also be used to clean the inside of the water treatment system 10.

Therefore, the control device 20 of the water treatment system 10 of the present embodiment controls the chlorine water tank T2 in the circulation flow path that includes the intermediate tank T1, flow paths C2, C3, and C8, and the RO filter 16. By circulating chlorinated water, the inside of each tank and circulation channel in the circulation channel of the water treatment system 10 is cleaned.

Note that the RO filter 16 is configured so that, in principle, chlorine in chlorine water does not pass therethrough. For this reason, by circulating chlorine water in the circulation flow path that includes the intermediate tank T1, flow paths C2, C3, and C8, and the RO filter 16, the chlorine water is It becomes possible to concentrate chlorine. Thereby, the interior of the water treatment system 10 can be efficiently cleaned using the chlorinated water existing in the water treatment system 10. Furthermore, with this method, there is no need to replenish the amount of chlorinated water used for internal cleaning of the water treatment system 10 from the outside, or the amount required is extremely small, and as a result, the amount of concentrated wastewater generated by internal cleaning can be reduced. This can significantly reduce the maintenance effort and complexity of maintenance work by the user.

Specifically, the control device 20 is configured to include an intermediate tank T1, channels C2, C3, and C8, and an RO filter 16, depending on the estimation result of the chlorine concentration of the chlorine water in the chlorine water tank T2. Determine the amount of chlorine water to be circulated for internal cleaning of the circulation channel.

Then, the control device 20 circulates the determined amount of chlorine water in the circulation channel by controlling the first pump P1. As a result, in the process of chlorine water circulating through the intermediate tank T1, flow paths C2, C3, and C8, and the RO filter 16, when the chlorine water passes through the RO filter 16, chlorine remains in the circulation flow path, and the RO filter By increasing the chlorine concentration contained in the chlorine water circulating through the circulation flow path on the inflow side of No. 16, the circulation flow path including the intermediate tank T1, flow paths C2, C3, and C8, and the RO filter 16 is created. be purified.

For example, the control device 20 determines the amount of chlorine water to be passed through the RO filter 16 according to the estimated chlorine concentration of the chlorine water, and controls the first pump P1 for a predetermined number of times. , controls to drive the first pump P1, etc., to cause chlorine water to cross-flow to the RO filter 16 until a desired chlorine concentration is reached. By repeating the cross-flow of chlorinated water to the RO filter 16, it becomes possible to control the chlorine concentration of the chlorinated water circulating through the circulation channel to a desired concentration.

More specifically, the chlorine concentration of the chlorine water circulating through the circulation channel increases by the amount of water lost by cross-flowing to the RO filter 16 (hereinafter also simply referred to as "permeated water"). Therefore, by measuring the amount of permeated water cross-flowed to the RO filter 16 with a flow meter (not shown), or from the increase in water in the water storage tank T3 in which permeated water is stored, the amount of permeated water lost due to cross-flow can be determined. Prove. The chlorinated water becomes concentrated by the amount of permeated water. By performing the cross flow for a long time, the cumulative amount of permeated water increases, and as the total amount of permeated water increases, the chlorine concentration of the chlorine water flowing through the circulation channel increases.

For this reason, the control device 20 controls the chlorine concentration of the chlorine water circulating through the circulation flow path to a desired concentration based on the total amount of permeated water flowing out of the circulation flow path by cross-flowing to the RO filter 16, for example. It can be determined whether or not.

More specifically, since the initial concentration of chlorine water stored in the chlorine water tank T2 is known, the control device 20 creates chlorine water based on the technology disclosed in Japanese Patent No. 7092425, for example. The chlorine concentration of the chlorine water in the chlorine water tank T2 is estimated based on how much time has passed and the temperature has changed since the initial stage, and the amount of chlorine water with the estimated chlorine concentration is cross-flowed to the RO filter 16. , it is possible to estimate the chlorine concentration of the chlorinated water circulating in the circulation channel.

Another method is to pour a solution or solid containing a predetermined amount of free chlorine into the sink 14 and pour a predetermined amount of recycled water from the faucet 12 into the sink 14 to obtain chlorine water with a desired concentration. It is also possible to flow into the circulation channel. In this case, since the chlorine concentration of the chlorine water in the circulation flow path is known, the control device 20 controls the circulation flow path depending on how much crossflow has occurred to the RO filter 16, similar to the method described above. The chlorine concentration of chlorinated water can be estimated.

Further, whether the chlorine concentration of the water circulating through the circulation channel has reached a desired chlorine concentration may be determined based on past data or the like. For example, the control device 20 refers to a table or the like in which the initial chlorine concentration of the chlorinated water to be circulated, the time for circulating the chlorinated water in the circulation channel, and the chlorine concentration of the water in the circulation channel at that time are associated. Then, it may be determined whether the chlorine concentration of the water circulating through the circulation channel has reached a desired chlorine concentration.

Then, for example, the control device 20 determines the time period for circulating the chlorinated water in the RO filter 16 or the circulation channel according to the estimated chlorine concentration of the chlorinated water, and controls the first pump P1 to determine the time period for which the chlorinated water is circulated. Circulate chlorinated water for an hour. In this case, more specifically, the control device 20 circulates the determined amount of chlorine water in the circulation flow path for the determined time by controlling the driving time of the first pump P1. The time for driving the first pump P1 may be continuous or intermittent, and is controlled depending on the degree of dirt inside the water treatment system 10.

For example, the control device 20 determines the retention time for retaining the chlorine water and the amount of concentrated chlorine water to retain in the intermediate tank T1 according to the estimated chlorine concentration of the chlorine water, and determines the retention time and the amount of concentrated chlorine water to retain in the intermediate tank T1. , by controlling the first pump P1, chlorine water is retained in the intermediate tank T1. In this case, more specifically, the control device 20 drives the first pump P1 and then controls the first pump P1 to stop for a predetermined period of time, so that the control device 20 operates the intermediate tank T1 for the determined period of time. By retaining concentrated chlorine water, dirt in the intermediate tank can be effectively cleaned.

As described above, when cleaning the inside of the water treatment system 10 using chlorinated water, by including the RO filter 16 in the circulation channel that circulates the chlorinated water, the water circulating in the circulation channel can be cleaned. By concentrating chlorine and increasing its chlorine concentration, the interior of the water treatment system 10 can be appropriately cleaned.

The control device 20 of the water treatment system 10 can be realized, for example, by a computer 50 shown in FIG. 2. The computer 50 includes a CPU 51, a memory 52 as a temporary storage area, and a non-volatile storage unit 53. The computer 50 also includes an input/output interface (I/F) 54 to which an input/output device (not shown) is connected, and a read/write (R/W) unit 55 that controls the reading and writing of data from and to a recording medium. The computer 50 also includes a network interface (I/F) 56 that is connected to a network such as the Internet. The CPU 51, memory 52, storage unit 53, input/output I/F 54, R/W unit 55, and network I/F 56 are connected to one another via a bus 57.

The storage unit 53 can be realized by a hard disk drive (HDD), solid state drive (SSD), flash memory, or the like. A program for making the computer 50 function is stored in the storage unit 53 as a storage medium. The CPU 51 reads the program from the storage unit 53, expands it into the memory 52, and sequentially executes the processes included in the program.

The memory unit 53 stores indicators (turbidity, color, viscosity, water temperature, water pressure, pH, SS: suspended solids, TOC: total organic carbon, bacteria count, DO: dissolved oxygen, BOD: biological oxygen demand, COD: chemical oxygen demand, T-N: total nitrogen, T-P: total phosphorus, etc.) that indicate the degree of dirtiness inside the water treatment system 10, as well as fluctuation data thereof, and various data used when performing internal cleaning of the water treatment system 10 using chlorine water. For example, the memory unit 53 stores table data that corresponds to the chlorine concentration of the chlorine water, the amount of chlorine water, and the time for circulating the chlorine water in the circulation flow path (or the amount of chlorine water that is passed through the RO filter 16, the amount of chlorine water that is circulated in the circulation flow path, or the residence time and amount of chlorine water for retaining the chlorine water in the intermediate tank T1, etc.). Based on this table data, the amount of chlorine water and the time for circulating the chlorine water in the circulation flow path, etc. (or the amount of chlorine water to be passed through the RO filter 16, the amount of chlorine water to be circulated in the circulation flow path, or the retention time and amount of chlorine water to be retained in the intermediate tank T1, etc.) are determined according to the chlorine concentration of the chlorine water.

Note that the functions realized by the program can also be realized by, for example, a semiconductor integrated circuit, more specifically, an application specific integrated circuit (ASIC).

<Operation of water treatment system 10>

Next, the operation of the water treatment system 10 of the embodiment will be explained. The control device 20 of the water treatment system 10 executes the control processing routine shown in FIG. 3 every time a predetermined time elapses. In addition, below, the case where the time to circulate chlorine water is determined according to the chlorine concentration of the chlorine water in the chlorine water tank T2, and the chlorine water is circulated in the circulation flow path for that time will be described as an example.

In step S100, the CPU 51 of the control device 20 estimates the chlorine concentration of the chlorine water in the chlorine water tank T2.

In step S102, the CPU 51 of the control device 20 refers to the table data stored in the storage unit 53 and determines the amount of chlorinated water to be circulated in the circulation channel according to the chlorine concentration estimated in step S100. .

In step S104, the CPU 51 of the control device 20 refers to the table data stored in the storage unit 53, and according to the chlorine concentration of the chlorinated water estimated in step S100 and the amount of chlorinated water determined in step S102, Determine the time for circulating chlorinated water in the circulation channel.

The time for circulating chlorinated water in the circulation flow path depends on the amount of chlorine water, the chlorine concentration, the scale of the water treatment system 10 (the capacity of the tank used, the length and volume of the circulation flow path, etc.), and/or the length of time in the circulation flow path. It varies depending on the degree of contamination and the interval between internal cleanings. In the table data stored in the storage unit 53, an appropriate circulation time according to at least the amount of chlorinated water and the chlorine concentration is set in advance. Therefore, the CPU 51 of the control device 20 refers to the table data stored in the storage unit 53 and determines the time period for circulating the chlorinated water in the circulation channel.

In step S106, the CPU 51 of the control device 20 supplies the amount of chlorine water determined in step S102 to the RO filter 16 by controlling the second pump P2 to drive. Note that the CPU 51 of the control device 20 controls the valve B to be switched so that the water flowing out from the RO filter 16 flows into the flow path C8.

In step S108, the CPU 51 of the control device 20 controls the chlorine water supplied in step S106 to be circulated within the circulation channel by controlling the first pump P1 to be driven.

In step S110, the CPU 51 of the control device 20 determines whether the circulating time determined in step S104 has elapsed. If the circulating time determined in step S104 has elapsed, the control processing routine is ended. On the other hand, if the circulating time determined in step S104 has not elapsed, the process returns to step S108, and the circulation of chlorine water in the circulation channel is repeated.

In addition, in step S110, the CPU 51 of the control device 20 determines whether the chlorine concentration of the chlorine water circulating in the circulation flow path has reached a desired concentration using the determination method described above, and controls the circulation flow path. Control may be performed to repeat the circulation of chlorine water in the circulation channel until the chlorine concentration of the circulating chlorine water reaches a desired concentration.

As a result, the chlorine in the water circulating in the circulation channel is concentrated, and the chlorine concentration increases, so that the interior of the water treatment system 10 is appropriately cleaned. Note that after this, the CPU 51 of the control device 20 controls the valve B to be switched so that the water flowing out from the RO filter 16 flows into the flow path C9.

As explained above, the water treatment system 10 according to the embodiment includes a channel through which water flows, a chlorinated water tank T2 in which chlorinated water is stored, and an intermediate tank T1 in which used water is stored. It includes an RO filter 16 that reduces the concentration of hypochlorous acid contained in permeated water, a temperature sensor 18, at least one pump P1, P2, P3, and a control device 20. Then, the control device 20 of the water treatment system 10 estimates the chlorine concentration of the chlorine water in the chlorine water tank T2 based on the temperature detected by the temperature sensor 18, and adjusts the chlorine concentration in the intermediate tank T1 according to the estimated chlorine concentration. The amount of chlorinated water to be circulated through the circulation flow path including the flow paths C2, C3, and C8 and the RO filter 16 is determined. The control device 20 circulates the determined amount of chlorine water in the circulation channel by controlling at least one or more pumps P1, P2, and P3, allows the chlorine water to pass through the RO filter 16, and closes the circulation channel. The circulating flow path is purified by increasing the chlorine concentration contained in the circulating chlorinated water. Thereby, the interior of the water treatment system can be efficiently cleaned using the chlorinated water existing in the water treatment system 10. With this method, there is no need to replenish the amount of chlorinated water used for internal cleaning of the water treatment system 10 from the outside, or the amount required is extremely small, and as a result, the amount of concentrated wastewater generated by internal cleaning can also be reduced. , the maintenance effort and complexity of maintenance work by the user can be significantly reduced. Therefore, according to this embodiment, the amount of waste water generated when cleaning the inside of the water treatment system can be suppressed. Moreover, autonomous chlorine water cleaning for suppressing dirt in the intermediate tank T1 and the flow path becomes possible, and usability is improved.

Note that the present disclosure is not limited to the embodiments described above, and various modifications and applications are possible without departing from the gist of the present invention.

For example, in the above embodiment, a case has been described in which the internal cleaning is performed using chlorine water stored in the chlorine water tank T2, but the present invention is not limited to this. For example, chlorine water (or water and chlorine tablets) may be added from the sink 14, and the chlorine water may be circulated in the circulation channel. In this case, the chlorine concentration of the additionally added chlorine water (or water and chlorine tablet) is known and becomes a predetermined value. For this reason, the control device 20 may, for example, respond to the additional injection of chlorine water and circulate the additional chlorine water in the circulation channel for a predetermined period of time. Alternatively, the control device 20 may circulate both the chlorine water stored in the chlorine water tank T2 and the additionally added chlorine water in the circulation flow path. In this case, the control device 20 determines the time for circulation in the circulation channel, etc., depending on the chlorine concentration of the chlorine water stored in the chlorine water tank T2 and the chlorine concentration of the additionally added chlorine water. You may also do so.

Further, in the above embodiment, the control device 20 simply controls the chlorine concentration of the chlorine water circulating through the circulation channel to a desired concentration, but the control device 20 is not limited to this. For example, the control device 20 determines the cleaning area and cleaning frequency in the water treatment system 10 according to the degree of contamination of the water in the circulation flow path, and selects a desired cleaning area and cleaning frequency according to the determined cleaning area and cleaning frequency. The chlorine concentration of the chlorine water in the circulation channel may be controlled so that the chlorine concentration is the same.

The degree of water contamination is based on actual measured values and index values of general water quality evaluation items (turbidity, electrical conductivity, chromaticity, pH, total hardness, free chlorine, COD, TOC, TN, or NH4 amount, etc.) , fluctuation values, fluctuation trends, as well as the location where the water treatment equipment is installed (whether it is a home, apartment complex, village, commercial facility, or factory, etc.) and the target of treatment (whether it is hand washing wastewater, shower, kitchen, toilet, etc.) Estimated values based on accumulated data regarding differences in water quality depending on whether the water quality is domestic or industrial wastewater used in The water quality change in the water treatment system 10 is estimated from the amount of water discharged from the tap, frequency of use, interval of use, etc.).

For this reason, the control device 20 acquires data regarding the degree of water contamination as described above, determines the cleaning parts and cleaning frequency in the water treatment system 10 based on the data, and determines the cleaning parts and cleaning frequency in the water treatment system 10. The chlorine concentration of the chlorine water in the circulation channel is controlled according to the frequency so that the desired chlorine concentration is achieved. For example, the control device 20 determines a region through which highly contaminated water flows as a cleaning region, and sets the frequency of cleaning of that cleaning region to be high. For example, when the degree of contamination is high, the control device 20 controls the chlorine concentration of the circulated chlorine water to be increased. Thereby, the chlorine concentration of the chlorine water flowing through the circulation flow path can be appropriately controlled depending on the degree of contamination of the water flowing through the circulation flow path of the water treatment system 10.

Note that examples of cleaning conditions include the following.

When cleaning the water treatment system 10 every day, the cleaning is performed at a chlorine concentration of 0.1 ppm to 100 ppm, preferably 1 ppm to 20 ppm, for 1 minute to 10 hours. The cleaning timing is such that during the first water storage circulation, the amount of chlorine water necessary to clean the circulation flow path is prepared to the desired concentration, and is automatically poured into the cleaning area for cleaning.

In addition, when it is necessary to dilute the concentrated chlorine, the required amount of treated water can be poured from the water storage tank T3 into the circulation flow path to create chlorine water of the desired low concentration.

Note that the amount of chlorine water used for cleaning is determined by the scale of the water treatment system 10, the sizes of various tanks, and the volume of the circulation channel. The concentration of chlorine water is appropriately set based on accumulated data depending on the degree of contamination of water flowing in from the sink 14. The concentration of chlorine water also changes depending on the frequency of cleaning. An example of cleaning conditions when the capacity of the intermediate tank T1 is 10L is shown below.

(1) Highly concentrated chlorine water (preferably chlorine concentration of 100 ppm to 1000 ppm) is prepared, and the bottom part of the intermediate tank T1 in the circulation flow path where dirt tends to accumulate is left to wash for 1 minute to 1 hour.
(2) Add the treated water from the water storage tank T3 to the intermediate tank T1 using a pump, dilute the chlorine water in the intermediate tank T1 (preferably to a chlorine concentration of 1 ppm to 500 ppm), increase the water level, and pump the water in the intermediate tank T1 for 1 minute. Leave it on for ~1 hour and then wash.
(3) Add treated water from the water storage tank T3 until the intermediate tank T1 is full, further dilute the chlorinated water (chlorine concentration 1 ppm to 250 ppm) until it is full, and leave it for 1 minute to 2 hours. Wash.
(4) The chlorinated water that washed the intermediate tank T1 is filtered by the RO filter 16, and the permeated water is sent to the water storage tank T3 again as treated water.
(5) Send the treated water from the water storage tank T3 to the intermediate tank T1 again to wash the inside of the intermediate tank T1.
(6) The chlorine remaining in the intermediate tank T1 is washed away, and the water is drained into the drainage tank T4, and the cleaning process is completed.

Although the present specification has described an embodiment in which the program is pre-installed, the program may also be provided by storing it on a computer-readable recording medium. For example, the program may be provided in a form stored on a non-transitory storage medium such as a CD-ROM (Compact Disk Read Only Memory), a DVD-ROM (Digital Versatile Disk Read Only Memory), or a USB (Universal Serial Bus) memory. The program may also be provided in a form in which it is downloaded from an external device via a network.

Note that the process that the CPU reads and executes the software (program) in the above embodiments may be executed by various processors other than the CPU. In this case, the processor is a PLD (Programmable Logic Device) whose circuit configuration can be changed after manufacturing, such as an FPGA (Field-Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit) to execute specific processing. An example is a dedicated electric circuit that is a processor having a specially designed circuit configuration. Alternatively, a GPGPU (General-purpose graphics processing unit) may be used as the processor. Further, each process may be executed by one of these various processors, or a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs, a CPU and an FPGA, etc.). ) can also be executed. Further, the hardware structure of these various processors is, more specifically, an electric circuit that is a combination of circuit elements such as semiconductor elements.

Moreover, each process of this embodiment may be configured by a computer or a server equipped with a general-purpose arithmetic processing device, a storage device, etc., and each process may be executed by a program. This program is stored in a storage device, and can be recorded on a recording medium such as a magnetic disk, optical disk, or semiconductor memory, or can be provided through a network. Of course, any other components need not be realized by a single computer or server, but may be realized by being distributed among multiple computers connected via a network.

All documents, patent applications, and technical standards mentioned herein are incorporated by reference to the same extent as if each individual document, patent application, and technical standard was specifically and individually indicated to be incorporated by reference. Incorporated herein by reference.

In addition, in the above embodiment, unless there is a description of "only", such as "based only on XX", "according only to XX", or "in the case of only XX", the meaning in this specification is Note that it is envisaged that additional information may also be considered. As an example, the statement ``if a, do b'' does not necessarily mean ``if a, always do b'' unless explicitly stated.

Furthermore, even if there is an aspect in which a method, program, terminal, device, server, or system (hereinafter referred to as a "method, etc.") performs an operation different from that described in this specification, each aspect of the disclosed technology The object is the same operation as any of the operations described in this specification, and the existence of operations that are different from the operations described in this specification makes the method etc. each aspect of the technology of the present disclosure. It is not outside the scope of.

Regarding the above embodiments, the following additional notes are further disclosed.

(Appendix 1)
A flow path through which chlorine water flows;
A water circulation flow path having a filter that is impermeable to hypochlorous acid,
The chlorine concentration of the chlorine water circulating through the circulation flow path is controlled to a desired concentration by cross-flowing the chlorine water to the filter.
How to control chlorine concentration.

(Additional note 2)
A tank where chlorinated water is stored,
temperature sensor;
A water treatment device comprising a control device,
The control device includes:
Estimating the chlorine concentration of chlorine water in the tank based on the temperature detected by the temperature sensor,
determining the amount of chlorine water to be circulated through the circulation channel according to the estimated chlorine concentration;
The method for controlling chlorine concentration as described in Supplementary Note 1.

(Additional note 3)
The control device further includes:
Determining the time for circulating or retaining the chlorinated water in the circulation flow path depending on the cleaning site in the water treatment device,
circulating or retaining the chlorinated water for the determined amount of time by controlling at least one pump;
A cleaning system for a water treatment device that implements the method for controlling chlorine concentration according to Supplementary Note 1 or 2.

(Additional note 4)
The control device includes:
Determining cleaning parts and cleaning frequency in the water treatment device according to the degree of contamination of the water in the circulation flow path,
controlling the chlorine concentration of the chlorine water in the circulation flow path to achieve a desired chlorine concentration according to the determined cleaning area and cleaning frequency, and cleaning the water treatment device;
A cleaning system for a water treatment device according to Supplementary Note 3.

(Appendix 5)
A program for causing a computer to execute the chlorine concentration control method described in appendix 2.

(Appendix 6)
A water circulation type water treatment device equipped with the cleaning system described in Appendix 3 or Appendix 4.

10 Water treatment system 12 Faucet 14 Sink 16 RO filter 18 Temperature sensor 20 Control device P1 First pump P2 Second pump P3 Third pump T1 Intermediate tank T2 Chlorinated water tank T3 Water storage tank T4 Drainage tank

Claims (6)

A method for cleaning each location in a water treatment device that can be installed at any location, the method comprising:
In the water treatment device,
A channel through which chlorinated water flows,
In a water circulation flow path equipped with a filter that does not allow hypochlorous acid to pass through,
By cross-flowing chlorinated water collected from a tank included in the water treatment device and storing chlorinated water to the filter, the chlorine concentration of the chlorinated water circulating through the circulation channel can be adjusted to a desired level. controlling the concentration to a concentration of and cleaning each location in the water treatment device;
Method. temperature sensor;
The water treatment device includes a control device,
The control device includes:
Estimating the chlorine concentration of chlorine water in the tank based on the temperature detected by the temperature sensor,
Determining the amount of chlorinated water to be circulated through the circulation channel by controlling the amount of chlorinated water flowing into the filter according to the estimated chlorine concentration;
The method according to claim 1. The control device further includes:
Determining the time for circulating or retaining the chlorinated water in the circulation flow path according to the estimated chlorine concentration of the chlorinated water,
circulating or retaining the chlorinated water for the determined amount of time by controlling at least one pump;
A cleaning system for water treatment equipment, implementing the method according to claim 2. The control device includes:
Determining cleaning parts and cleaning frequency in the water treatment device according to the degree of contamination of the water in the circulation flow path,
controlling the chlorine concentration of the chlorine water in the circulation flow path to achieve a desired chlorine concentration according to the determined cleaning area and cleaning frequency , and cleaning the water treatment device;
The cleaning system for water treatment equipment according to claim 3. A program for causing a computer to execute the method according to claim 2. A water circulation type water treatment device equipped with the cleaning system according to claim 3 or 4.

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