KR101800290B1 - Alkaline waste water neutralizing equipment and method for neutralizing alkaline waste water using the same - Google Patents

Abstract

The present invention relates to alkaline waste water neutralization equipment and a neutralization method of alkaline waste water using the same. The alkaline waste water neutralization equipment includes: a reactor main body which causes a neutralization reaction with carbon dioxide gas by accommodating alkaline waste water (raw water); a raw water inflow line which is included in one side of the reactor main body; a treatment water discharge line which is included in the other side of the reactor main body; a carbon dioxide gas injection line which is included in the raw water inflow line; and a stirrer which stirs the raw water with carbon dioxide gas. The alkaline waste water neutralization equipment and the alkaline waste water neutralization method according to the present invention have effects of performing a neutralization reaction at high efficiency and performing maintenance easily by neutralization treatment by stirring carbon dioxide gas with alkaline waste water at a high speed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkaline wastewater neutralization apparatus using carbon dioxide gas and an alkaline wastewater neutralization apparatus using the same,

The present invention relates to an apparatus for neutralizing alkaline wastewater using carbon dioxide gas and a method of neutralizing alkaline wastewater using the same. More particularly, the present invention relates to a method for neutralizing alkaline wastewater by performing a neutralization reaction with high efficiency by stirring carbon dioxide gas and alkaline wastewater at high speed, To an alkaline wastewater neutralization apparatus capable of facilitating management and a method of neutralizing alkaline wastewater using the same.

Alkaline wastewater occurs in various industries, especially in tunnel construction and inorganic waste water, paper, leather and semiconductor cleaning processes. The wastewater generated in this process contains a large amount of alkalinity and has a strong alkalinity ranging from 12 to 13 at high pH. Therefore, a process of neutralizing the pH is necessary for the subsequent treatment and discharge of such wastewater.

Conventionally, as a method for neutralizing alkaline wastewater, alkaline wastewater is neutralized by using a large amount of neutralizing agent, that is, a high concentration (for example, 98% or more) of sulfuric acid, which is a large amount of neutralizing agent composed of liquid or solid.

However, the above sulfuric acid has a complicated and time-consuming process due to the enforcement of the Chemical Substance Control Act, and it has a risk factor in transportation and use when using high-concentration sulfuric acid, and it is difficult to maintain such that toxicity and harmfulness are exposed And it has a disadvantage that it takes more than 70% of total water treatment cost and requires a large maintenance cost.

Therefore, a method of using a low concentration (less than 10%) sulfuric acid was tried for exemption from the Chemical Substance Control Act. However, when such a low concentration of sulfuric acid is used as a neutralizing agent, the maintenance cost required for the neutralization process is further increased.

That is, when a low concentration (less than 10%) sulfuric acid neutralizing agent is used for the exemption of the Chemical Substance Control Act, the capacity for the chemical storage container is increased by about 10 times that of the existing high concentration (98%) sulfuric acid, It is hard to keep up with the difficulties of maintenance.

In addition, when the sulfuric acid neutralizing agent having a high concentration or a low concentration is used as described above, the non-carbonate hardness is increased by the sulfuric acid reactant, and ecological and environmental problems are caused in the discharged stream, and new neutralization technology is desperately required.

The neutralization treatment method of alkaline wastewater using a gas neutralizing agent has been attempted, but the degree of the technical development is still small in terms of the efficiency of the neutralization apparatus and the diversity of the treatment process.

Published Japanese Patent Application No. 10-2003-0046263 (published Jun. 2003) Published Japanese Patent Application No. 10-2004-0020493 (published on March 3, 2004) Japanese Patent Application Laid-Open No. 10-2009-0013316 (published on February 21, 2009)

It is an object of the present invention to provide an alkaline wastewater neutralization apparatus which can efficiently neutralize alkaline wastewater and is easy to maintain and environmentally friendly.

Another object of the present invention is to provide a method of neutralizing alkaline wastewater which is easy to maintain, low in processing cost, and environmentally friendly by using the above alkaline wastewater neutralization apparatus.

According to an aspect of the present invention, there is provided a method of manufacturing a reactor, including: a reactor main body accommodating alkaline wastewater (raw water) to cause a neutralization reaction with carbon dioxide gas; a raw water inflow line provided at one side of the reactor main body; A process water discharge line provided on the other side of the main body, a carbon dioxide gas injection line provided in the raw water inflow line, and an agitator for stirring the raw water and the carbon dioxide gas.

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, the raw water inflow line may be provided at the lower end of the reactor body and the treated water discharge line may be provided at the upper end of the reactor body. At this time, the treatment water discharge line may be positioned such that its inlet is inserted into the reactor body.

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, a baffle for forming a vortex may protrude inward and may be provided in the inner surface of the reactor body. The baffles may be spaced apart from one another along the inner side of the reactor body and the centers of adjacent baffles may be at different heights.

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, a micro-acid substrate for mixing the alkaline wastewater and the carbon dioxide gas may be provided at the outlet side of the raw water inflow line.

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, a pH sensor is provided in the reactor main body, a carbon dioxide gas sensor is provided at the outlet side of the treated water discharge line, and the carbon dioxide gas is flowed .

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, the reactor main body may be cylindrical, and a circulation line for circulating unreacted carbon dioxide gas may further be provided.

In the alkaline wastewater neutralization apparatus according to an embodiment of the present invention, the stirring wing of the stirrer is composed of two stages, upper and lower, and can rotate at a speed of 200 rpm to 3000 rpm.

According to an aspect of the present invention, there is provided a method of controlling an amount of alkaline wastewater, comprising the steps of: (a) storing alkaline wastewater in a first flow rate adjusting tank and supplying the alkaline wastewater to a next step at a constant flow rate; (b) A step of neutralizing the supplied alkaline wastewater by using carbon dioxide gas in a neutralization tank, (c) a step of primary coagulating the solid content contained in the neutralization water discharged from the neutralization tank through an inorganic coagulant in a primary chemical reaction tank, (d) coagulating the neutralized neutralized water with the polymer flocculant in a flocculation tank to a predetermined size, (e) coagulating the flocculated solid discharged from the flocculating tank in a settling tank, (F) a step of discharging the neutralized water separated from the solid matter to the stabilizing tank at the same time as the stabilizing tank After standing decomposed by microorganisms relates to the neutralization of alkaline waste water processing method comprises a step of discharge. At this time, the neutralization tank used in the step (b) is an alkaline wastewater neutralization apparatus according to the present invention.

In the method for neutralizing alkaline wastewater according to an embodiment of the present invention, the step (b) may be performed at the end of the step (f).

According to another aspect of the present invention, there is provided a process for producing alkaline wastewater, comprising the steps of: (a) storing alkaline wastewater in a first flow rate adjusting tank and supplying the alkaline wastewater to a next step at a constant flow rate; (b) (C) storing the desorbing liquid supplied from the dehydrator tank in a desalting tank; and (d) removing the alkaline desorbing liquid supplied from the desalting tank from the neutralization tank with carbon dioxide gas And (e) a step of neutralizing the organic matter remaining in the neutralized water discharged from the neutralization tank by decomposing and discharging the organic matter in the stabilized tank by using microorganisms, and a method of neutralizing alkaline wastewater . In this case, the neutralization tank used in the step (d) is an alkaline wastewater neutralization apparatus according to the present invention.

In the method for neutralizing alkaline wastewater according to an embodiment of the present invention, it is possible to further include a step of coagulating the solid content contained in the neutralized water with an inorganic coagulant between steps (d) and (e) have.

The alkaline wastewater neutralization apparatus according to the present invention having the above-mentioned structure can neutralize the alkaline wastewater by using carbon dioxide gas to ensure the stability in the water treatment of the alkaline wastewater, The installation space can be minimized and the maintenance cost can be reduced.

In particular, the apparatus for neutralizing alkaline wastewater according to the present invention performs high-efficiency neutralization reaction by mixing carbon dioxide gas and alkaline wastewater at high speed using a high-speed stirrer and baffles on the inner wall of the reactor body to effectively mix carbon dioxide gas and alkaline wastewater There is an advantage to be able to do.

Further, the method of neutralizing alkaline wastewater according to the present invention has the effect of being able to treat alkaline wastewater in an environmentally friendly manner, with ease of maintenance, low processing cost, and the like by using the neutralization apparatus as described above.

1 is a perspective view of an alkaline wastewater neutralization apparatus according to an embodiment of the present invention.
2 is a process flow chart of a method for neutralizing alkaline wastewater according to an embodiment of the present invention.
3 is a process flow chart of a method for neutralizing alkaline wastewater according to another embodiment of the present invention.
4 is a process flow chart of the alkaline wastewater neutralization treatment method according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various implementations, and particular implementations are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1 is a perspective view of an alkaline wastewater neutralization apparatus according to an embodiment of the present invention. Referring to FIG. 1, an alkaline wastewater neutralization apparatus 100 according to the present invention includes a reactor main body 10 for receiving alkaline wastewater (raw water) and causing a neutralization reaction with carbon dioxide (CO ₂ ) gas, A process water discharge line 30 provided on the other side of the reactor main body 10 and a carbon dioxide gas injection line 40 connected to the raw water inflow line 20, And an agitator 50 for agitating raw water and carbon dioxide gas.

In the alkaline wastewater neutralization apparatus 100 according to an embodiment of the present invention, the raw water inflow line 20 may be provided at the lower end of the reactor main body 10. At this time, the outlet 21 of the raw water inflow line 20 is partially inserted inward from the bottom surface of the reactor main body 10. The raw water inflow line 20 may be provided with a flow control valve 22 for controlling the flow rate and a check valve 23 for preventing back flow.

A carbon dioxide gas injection line (40) is connected to the raw water inflow line (20).

In order to use carbon dioxide gas as a neutralizing agent for alkaline wastewater, it is important to design the structure of the reactor so that the alkaline wastewater can sufficiently contact the carbon dioxide gas. Accordingly, the reactor body 10 according to the present invention is characterized in that it has a radial baffle 11 on its inner wall. Thus, when the alkaline wastewater contained in the reactor main body 10 is stirred, the entire wastewater does not rotate along the inner wall of the reactor, but forms a vortex by the baffle 11 so that it can sufficiently contact with the carbon dioxide gas. It is preferable that the baffles 11 are arranged at different heights from the neighboring baffles 11 for efficient stirring.

In addition, it is preferable that the fine acid substrate 60 is provided on the outlet 21 side of the raw water inflow line 20 above the outlet 21. The micro-acid substrate 21 may be formed by welding an arc-shaped metal plate having a plurality of holes 61 therein to the inside of the reactor main body 10. The alkaline wastewater containing carbon dioxide gas can be uniformly dispersed into the reactor through the holes 61 formed in the fine acid substrate 60 at the outlet 21 of the raw water inflow line 20. [

At this time, the reactor main body 10 is provided with a pH sensor 12 for measuring the pH of the alkaline wastewater into which the alkaline wastewater A flows through the raw water inflow line 20. In addition, the carbon dioxide injection line 40 is provided with a solenoid valve (MOV) 41 that is opened or closed to adjust the amount of carbon dioxide gas injected according to the pH value of the alkaline wastewater measured from the pH sensor 12. Thus, the injection amount of the carbon dioxide gas injected through the carbon dioxide injection line 40 becomes variable. The injection amount of the carbon dioxide gas can be controlled by a programmable logic controller (PLC) (not shown).

The alkaline wastewater (A) and the carbon dioxide gas supplied into the reactor main body (10) are stirred by the stirrer (50) to cause a hydration reaction and a neutralization reaction. The pressure in the reactor main body 10 is maintained at 0.5 to 1 kg / cm 2 by stirring the agitator 50, and a neutralizing action can be generated by mixing the alkaline wastewater with the carbon dioxide gas. The pressure is applied to the pressure gauge 13 Lt; / RTI >

The faster the stirring speed of the stirrer 50, the more efficient the neutralization reaction, but it is preferable to maintain the speed of 200 rpm to 3300 rpm, more preferably about 1000 rpm on average. If the stirring speed is less than 200 rpm, stirring effect is insignificant. If the stirring speed is more than 3000 rpm, the motor may be overloaded. At this time, a plurality of stirring vanes 53 may be provided in the stirring shaft 52 in a single or a plurality of vertical directions. The alternator (50) is controlled in speed by the speed change motor (51).

The mechanism of the hydration reaction and the neutralization reaction will be described as follows.

That is, the alkaline component present in the alkaline waste _{water, Ca (OH) 2 = Ca} +2 + 2 (OH) - a,

When the carbon dioxide gas enters the alkaline wastewater,

2CO ₂ + 2H ₂ O = 2H ₂ CO ₃ = 2H ⁺ + 2HCO ₃ ^-

Next, as a neutralization reaction,

Ca (OH) ₂ + 2CO ₂ + 2H ₂ O = Ca ^{+ 2} + 2OH ^- + 2H ⁺ + 2HCO ₃ ^- = 2H ₂ O + Ca (HCO ₃ ) ₂

Ca (OH) ₂ + Ca (HCO ₃ ) ₂ = 2CaCO ₃ + 2H ₂ O.

At this time, when the pH of the alkaline wastewater is 12, the amount of the carbon dioxide gas to be injected is,

H ⁺ x OH ^- = 10 ^{- 14}

12 = -Log (H ⁺ ) = -Log (10 ^-14 / OH ^- )

10 ^-14 / OH ^- = 10 ^-12

OH ^- = 10 < ^-2 > mole / l,

Therefore, Ca (OH) ₂ = 0.005 mole / l. In order to induce the softening reaction in the above reaction formula, 0.0025 mole / l of Ca (OH) ₂ must be neutralized.

At this time,

_{Ca (OH) 2 + 2CO 2} + 2H 2 O = 2H 2 O + Ca (HCO 3) 2

0.0025 Ca (OH) ₂ + 0.005 CO ₂ + 0.005 H ₂ O = 0.005 H ₂ O + 0.0025 Ca (HCO ₃ ) ₂

Therefore, when 1000 m3 of wastewater is treated per day,

0.005 mole / l = 0.22 g / l = 0.22 kg / m 2 = 220 kg / 1,000 m ₃ ,

'220 kgCO ₂ / day × 100 won / kg = 22,000 won / day', so that the maintenance cost can be greatly reduced.

For example, in the case where the neutralization process is carried out through the conventional sulfuric acid neutralizing agent, the alkali component present in the alkaline wastewater,

^{_{Ca (OH) 2 = Ca +2}} + 2 (OH) -

The hydration reaction when sulfuric acid enters the waste water

H ₂ SO ₄ = 2H ⁺ + SO ₄ ^-2

The neutralization reaction

_{Ca (OH) 2 + H 2} SO 4 = Ca +2 + 2 (OH) - + 2H + + SO 4 -2 = 2H 2 O + CaSO 4

0.05 Ca (OH) ₂ + 0.005 H ₂ SO ₄ = 0.01 2H ₂ O + 0.005 CaSO ₄

A 0.005 mole / l = 0.49g / l = 4.9g 10% H 2 SO 4 / l = 4,900kg 10% H 2 SO 4 / 1,000㎥,

The cost calculation _{(10% H 2 SO 4 =} 50 won / kg)

Day is calculated as "4,900 kg / day x 50 yuan / kg = 245,000 yuan / day ", so that the difference in the cost of the neutralization process using the carbon dioxide gas of the present invention may be about 10 times older.

As described above, the neutralized water B in the reactor body 10 is transferred to the next step through the treated water discharge line 30. The treated water discharge line 30 may be provided at the upper end of the reactor body 10. At this time, it is preferable that the inlet 31 of the treated water discharge line 30 is inserted and positioned inside the reactor body 10. As a result, the unreacted carbon dioxide gas, which may be present in the upper portion of the reactor body 10, can be prevented from being discharged together with the treated water. The treatment water discharge line 30 may be provided with a flow control valve 34 for controlling the flow rate and a check valve 33 for preventing back flow.

On the other hand, it is preferable to provide a carbon dioxide gas sensor 32 at the outlet side of the treated water discharge line 30. Thereby, a large amount of carbon dioxide gas is detected in the treated water B, and the injection of the carbon dioxide gas is blocked by the PLC (not shown).

In the alkaline wastewater neutralization apparatus 100 according to an embodiment of the present invention, a circulation line 70 for circulating unreacted carbon dioxide gas may be further provided on the outer side of the reactor main body 10. That is, unreacted carbon dioxide gas can be collected in the upper part of the reactor body 10, and the unreacted carbon dioxide gas is injected into the lower part of the reactor body 10 again by the forced circulation pump 73. The circulation line 70 may further include a flow control valve 72 for controlling the flow rate and a check valve 71 for preventing the reverse flow.

The shape of the reactor main body is not particularly limited, but it is preferable that the reactor main body is cylindrical in structure. As the material of the reactor main body 10, it is preferable to use stainless steel which is resistant to corrosion.

A drain line 80 for discharging CaCO ₃ , which is a product generated by the neutralization reaction, and debris, is provided on the bottom surface of the reactor body 10, and a drain valve 81 is provided for the drain line 80 .

Another aspect of the present invention relates to a method for neutralizing alkaline wastewater using the alkaline wastewater neutralization apparatus 100 according to the present invention as described above.

2 is a process flow chart of a method for neutralizing alkaline wastewater according to an embodiment of the present invention. 2, the method for neutralizing alkaline wastewater according to the present invention comprises the steps of (a) a first flow adjustment step (b) a neutralization step (c) a first chemical reaction step (d) And stabilization process discharge.

Hereinafter, the above steps will be described in detail.

(a) First flow rate adjustment process

This is a process in which the incoming alkaline wastewater (raw water) is firstly stored in a flow control tank and supplied to the next step process at a constant flow rate. This process is to maintain the stability in accordance with fluctuation of the flow rate and the water quality and to equalize and stabilize the water quality (equalize the influent load). At this time, the size of the flow control tank is determined according to the fluctuation mode of the incoming wastewater, and it is necessary to temporarily store the flow amount exceeding the maximum number of days. On the other hand, the shape of the flow rate adjusting tank is preferably a rectangle and a square so that the concentration of the wastewater can be made as uniform as possible. In addition, it is preferable that the flow rate adjusting tank is made of a reinforced concrete structure so as to maintain buoyancy stability.

(b) a neutralization step

This is a step of neutralizing the alkaline wastewater supplied from the first flow rate adjusting tank by using carbon dioxide gas in the neutralization tank. At this time, in the alkaline wastewater treatment method according to the present invention, the neutralization tank used in the neutralization process is the alkaline wastewater neutralization apparatus 100 as described above. Since the neutralization process is the same as described in the alkaline wastewater neutralization apparatus 100, further explanation is omitted. At this time, the CaCO ₃ discharged from the neutralization tank is sludge and CaCO ₃ It can be reintroduced into the primary flow regulator through the return line.

(c) Primary chemical reaction process

This is a step of primary solidifying the solid content contained in the neutralized water discharged from the neutralization tank through the inorganic flocculant in the primary chemical reaction tank. Examples of inorganic flocculants used in this process include aluminum sulfate (Al ₂ (SO ₄ ) ₃ , Alum), ferrous sulfate (FeSO ₄ ? 7H ₂ O), ferric chloride (FeCl ₃ ? 6H ₂ O) Aluminum (PAC), and the like, but are not limited thereto. It is preferable to perform rapid stirring immediately after injection of the coagulant to enhance the contact effect between the coagulant and the water microparticles, and to coagulate the flocs with the slow stirring as the coagulation proceeds.

(d) Coagulation step

This is a process of agglomerating the primary agglomerated neutralized water discharged from the primary chemical reaction tank into a solid of a predetermined size by using a polymer flocculant in an agglomeration tank. That is, in this step, the primary agglomerated sludge agglomerates more easily to facilitate sedimentation in the sedimentation tank. The flocculation process proceeds in the order of flocculation of the flocculant in the water, diffusion of the flocculant in the water, agitation for contacting the flocculant with the contaminant particles, and agglomeration for making large and heavy floc by growing the particles and ensuring settleability by slow stirring do. Examples of the polymer coagulant used in the present step include polyacrylamide, polyamine, polyacrylate, polyethyleneimine and the like, but are not limited thereto.

(e) Precipitation process

This is a step of precipitating a solidified aggregate of a predetermined size discharged from the flocculation tank in a settling tank and discharging the neutralized water separated from the solid into a stabilization tank. That is, to remove sedimentation solids that can be removed by gravity from the suspended solids in the neutralized water, it is intended to increase the treatment efficiency of the secondary treatment, shorten the treatment time, and improve the quality of the final effluent.

(f) Stabilization process

This is a step of decomposing and discharging organic matter remaining in the treated water discharged from the settling tank using a microorganism in the stabilization tank. Examples of the microorganism group that can be used for decomposing organic matter include Paramecium, Euglena, Vorticella, and Amoeba in the case of monocell protozoa, and nematodes, Vorbox, annular animals, and protozoa in the case of multicellular cells. no. The neutralized water having decomposed organic matter by the microorganism is eventually discharged to the outside.

3 is a process flow chart of a method for neutralizing alkaline wastewater according to another embodiment of the present invention. 3, the method for neutralizing alkaline wastewater according to the present invention comprises the steps of (a) a first flow adjustment step (b) a first chemical reaction step (c) an agglomeration step (d) a precipitation step (e) And stabilization process discharge.

In this embodiment, the above-described embodiment and all the unit processes are performed in the same manner, except that the neutralization process proceeds at the end of the precipitation process. In this embodiment, since the neutralization process is performed after the settling process, the sludge of the wastewater is removed and the pure alkaline wastewater is neutralized, thereby reducing the consumption amount of the carbon dioxide gas. In addition, it is possible to prevent the inorganic particles such as sand from rubbing with the agitator and the like and making the machine wear fast.

4 is a process flow chart of the alkaline wastewater neutralization treatment method according to another embodiment of the present invention. 4, the method for neutralizing alkaline wastewater according to the present embodiment includes the steps of (a) a first flow adjustment step (b) a dewatering step (c) a stripping liquid storage step (d) a neutralization step It proceeds. In this case, a primary chemical reaction process may be further introduced between the neutralization process (d) and the stabilization process (e), in which the solid content contained in the neutralization water is coagulated using an inorganic coagulant.

In this embodiment, there is an advantage that neutralization can be facilitated by removing the solid material sludge by using a dehydrator without passing through various chemical reactors and neutralizing the alkaline clean raw water with carbon dioxide gas.

Hereinafter, the dehydration process and the desorbing liquid storage process which are not described in the above embodiments will be described.

(b) Dehydration process

This is a process in which the alkaline wastewater supplied from the first flow rate adjusting tank is dehydrated in the dehydrator tank to remove the sludge. That is, the solid content contained in the alkaline wastewater is removed by a dehydrator in the form of a sludge cake, and the alkaline wastewater (desalted liquid) from which the solid content is removed is discharged.

(c) Storage of the solution

This is a step of storing the alkaline wastewater (desalination liquid) from which the solid matter discharged from the dehydrator tank is removed in the desalination bath, and the desalination liquid stored in the desalination liquid storage tank is then introduced into the neutralization process at the subsequent stage at a constant flow rate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: reactor body
11: Baffle
12: pH sensor
13: Pressure gauge
20: raw water inflow line
21: Outlet of raw water inflow line
22: Flow control valve
23: Check valve
30: treated water discharge line
31: Entrance of treated water discharge line
32: Carbon dioxide gas sensor
33: Check valve
34: Flow regulating valve window frame
40: Carbon dioxide gas injection line
41: Solenoid valve
50: stirrer
51: Stirrer motor
52: stirrer shaft
53: stirring wing
60: fine acid substrate
61: hole
70: circulation line
71: Check valve
72: Flow control valve
73: Forced circulation pump
80: drain line
81: drain valve
100: Alkaline waste water neutralization device

Claims (19)

A closed reactor body for causing a neutralization reaction with alkaline wastewater as carbon dioxide gas as raw water;
A raw water inflow line provided at one side of the reactor body;
A treated water discharge line provided on the other side of the reactor body;
A carbon dioxide gas injection line provided in the raw water inflow line; And
And a stirrer for stirring the raw water and the carbon dioxide gas,
The reactor body is provided with a circulation line for circulating unreacted carbon dioxide gas,
The baffles are disposed on the inner surface of the reactor body at a different height from each other along the inner surface of the reactor body, and the centers of the adjacent baffles are at different heights Located,
Wherein the reactor main body is provided with a pH sensor and the outlet of the treated water discharge line is provided with a carbon dioxide gas sensor,
Alkaline waste water neutralization system. delete delete The method according to claim 1,
Wherein the raw water inflow line is provided at a lower end of the reactor body and the treated water discharge line is provided at an upper end of the reactor main body. 5. The method of claim 4,
Wherein the treatment water discharge line is positioned such that its inlet is inserted into the inside of the reactor main body. The method according to claim 1,
And a micro-acid substrate for mixing alkaline wastewater and carbon dioxide gas is provided at the outlet side of the raw water inflow line. delete The method according to claim 1,
Wherein the carbon dioxide gas is adjusted in flow rate in conjunction with the pH sensor. delete The method according to claim 1,
Wherein the agitator is provided with a plurality of stirring vanes in a single or a plurality of distances in a direction perpendicular to the axis of the agitator. 11. The method of claim 10,
Wherein the agitator is rotated at a speed of 200 rpm to 3000 rpm. The method according to claim 1,
Characterized in that the reactor body is cylindrical. (a) storing the alkaline wastewater in a first flow regulator and feeding it to the next step at a constant flow rate;
(b) neutralizing the alkaline wastewater supplied from the first flow rate adjusting tank by using carbon dioxide gas in the neutralization tank;
(c) a step of primary solidifying the solid content contained in the neutralization water discharged from the neutralization tank through an inorganic coagulant in a primary chemical reaction tank;
(d) agglomerating the primary agglomerated neutralized water into a solid having a predetermined size by using a polymer flocculant in an agglomeration tank;
(e) precipitating a coagulated solid material of a predetermined size discharged from the coagulation tank in a settling tank and discharging the neutralized wastewater separated from the solid material into a stabilization tank; And
(f) decomposing and discharging organic matter remaining in the neutralization treatment water discharged from the settling tank using a microorganism in a stabilization tank,
The neutralization tank used in the step (b) is the alkaline wastewater neutralization apparatus according to claim 1,
A method for neutralization of alkaline wastewater. delete (a) storing the alkaline wastewater in a first flow regulator and feeding it to the next step at a constant flow rate;
(b) a step of primary solidifying the solid content contained in the alkaline wastewater discharged to the primary flow rate adjusting tank through the inorganic flocculant in the primary chemical reaction tank;
(c) agglomerating the primary agglomerated alkaline wastewater into a solid having a predetermined size by using a polymer flocculant in an aggregation tank;
(d) a step of precipitating the coagulated solid matter of a predetermined size discharged from the coagulation tank in a settling tank and discharging the alkaline wastewater separated from the solid matter into a neutralization tank;
(e) neutralizing the alkaline wastewater discharged from the settling tank with carbon dioxide gas in a neutralization tank; And
(f) decomposing and discharging organic matter remaining in the neutralization treatment water discharged from the neutralization tank using a microorganism in a stabilization tank,
The neutralization tank used in the step (e) is the alkaline wastewater neutralization apparatus according to claim 1,
A method for neutralization of alkaline wastewater. delete (a) storing the alkaline wastewater in a first flow regulator and feeding it to the next step at a constant flow rate;
(b) dehydrating the alkaline wastewater supplied from the first flow rate adjusting tank in a dehydrator tank to remove sludge;
(c) storing the desorbing liquid supplied from the dehydrator tank in a desalting tank;
(d) neutralizing the alkaline desolvation liquid supplied from the desalination tank by using carbon dioxide gas in a neutralization tank; And
(e) decomposing and discharging the organic matter remaining in the neutralization treatment water discharged from the neutralization tank using a microorganism in the stabilization tank,
The neutralization tank used in the step (d) is an alkaline wastewater neutralization apparatus according to claim 1,
A method for neutralization of alkaline wastewater. delete 18. The method according to claim 17, wherein the neutralization method further comprises the step of coagulating the solid content contained in the neutralization water with an inorganic coagulant between steps (d) and (e) A method for neutralizing wastewater.

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