KR102325246B1 - Neutralization apparatus using h2co3 gas of alkali waste water - Google Patents

Abstract

A neutralization treatment device for alkaline wastewater using carbon dioxide gas is introduced.
The neutralization treatment apparatus includes a wastewater supply tank to which wastewater is supplied, a gas tank for providing carbon dioxide, a gas-liquid contact unit for receiving and contacting wastewater and carbon dioxide gas, and the wastewater discharged from the gas-liquid contacting unit collides with a collision plate It may include a reactor to induce cavitation.

Description

Neutralization treatment device for alkaline wastewater using carbon dioxide {NEUTRALIZATION APPARATUS USING H2CO3 GAS OF ALKALI WASTE WATER}

The present invention relates to an apparatus for neutralization treatment of alkaline wastewater using carbon dioxide gas.

In general, alkaline wastewater is generated in a large amount in various environments, such as tunnel construction and inorganic wastewater, papermaking, leather and semiconductor cleaning. Since this alkaline wastewater has strong alkalinity containing a large amount of alkalinity, a process of neutralizing the pH of the wastewater is absolutely necessary for the subsequent treatment and discharge of the wastewater.

As a method of neutralizing alkaline wastewater, there is a method of neutralizing alkaline wastewater using a large amount of neutralizing agent, for example, a high concentration of sulfuric acid, which is a large amount of neutralizing agent consisting of liquid or solid. However, according to the enforcement of the Chemicals Control Act, the licensing procedure for sulfuric acid is complicated, and when high concentration sulfuric acid is used, the transport and use of sulfuric acid can be exposed to toxic and harmful effects.

In the past, low-concentration sulfuric acid was used as a neutralizing agent for alkaline wastewater in order to be exempt from the Chemicals Control Act. However, when low-concentration sulfuric acid is used as a neutralizing agent for alkaline wastewater, there is a problem in that the maintenance cost required for the neutralization process of alkaline wastewater is greatly increased.

Accordingly, there is a need for a technology capable of effectively neutralizing a large amount of alkaline wastewater.

Patent Literature: Domestic Patent Publication No. 10-2014-0023600 (published on February 27, 2014)

Embodiments of the present invention are to provide an apparatus for neutralizing alkaline wastewater using carbon dioxide gas, which can effectively neutralize alkaline wastewater using carbon dioxide gas.

According to an aspect of the present invention, there is provided an apparatus for neutralizing alkaline wastewater using carbon dioxide, comprising: a wastewater supply tank in which wastewater is supplied; a gas tank providing carbon dioxide; a gas-liquid contact unit receiving and contacting the wastewater and the carbon dioxide gas; and a reactor for inducing cavitation by changing the flow direction of the wastewater discharged from the gas-liquid contact unit.

At this time, the reactor includes a reaction tank; an inlet pipe for guiding the wastewater to the lower inside of the reaction tank; a collision plate spaced apart from the lower end of the input pipe so as to induce cavitation by changing the flow direction of the wastewater through collision with the wastewater; and a discharge pipe for discharging the wastewater accommodated in the reaction tank to the outside.

In addition, the gas-liquid contact unit may include: an orbiting moving pipe providing a movement path of the wastewater and the carbon dioxide gas; and a contact protrusion protruding from the inner surface of the orbiting pipe to increase a contact area between the wastewater and the carbon dioxide gas.

In addition, the contact protrusion may be provided in plural spaced apart spirally from the inner surface of the orbiting tube toward the outlet.

In addition, the contact protrusion is formed extending in the vertical direction from the inner surface of the orbiting tube; and an extension portion formed at an end of the pillar portion and having a larger diameter than the pillar portion.

In addition, the present invention is a gas recycling line for re-introducing the carbon dioxide gas in the reactor to the inlet side of the gas-liquid contact unit; a gas recycling line for re-injecting the carbon dioxide gas in the reactor to the inlet side of the gas-liquid contact unit; and a recycling valve selectively opening and closing the flow path of the gas recycling line.

In addition, the present invention is a first gas sensor for measuring the input carbon dioxide gas concentration of the carbon dioxide gas provided from the gas tank; a second gas sensor for measuring an exhaust carbon dioxide concentration of carbon dioxide gas discharged from the reactor; and a carbon dioxide gas dissolution rate is calculated using the input carbon dioxide gas concentration and the exhaust carbon dioxide gas concentration. It may further include a controller for controlling the recycling valve to be re-introduced to the inlet side of the gas-liquid contact unit through the.

The embodiments of the present invention have advantages in that, by using carbon dioxide gas to neutralize the alkaline wastewater, it is possible to neutralize the alkaline wastewater in an environmentally friendly manner, and the maintenance of the neutralization process of the alkaline wastewater is easy.

In addition, the embodiments of the present invention have the advantage that the carbon dioxide gas dissolution rate of the carbon dioxide gas in the wastewater can be increased by re-injecting the carbon dioxide gas that has not been dissolved in the reactor into the gas-liquid contact unit through the gas recycling line.

1 is a block diagram illustrating an apparatus for neutralizing alkaline wastewater using carbon dioxide gas according to a first embodiment of the present invention.
2 is a block diagram illustrating a gas-liquid contact unit of the apparatus for neutralization treatment of alkaline wastewater using carbon dioxide gas according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view illustrating a line “AA” of FIG. 2 by cutting it.
4 is a block diagram illustrating a reactor of an apparatus for neutralization treatment of alkaline wastewater using carbon dioxide gas according to an embodiment of the present invention.
5 is a block diagram illustrating an apparatus for neutralizing alkaline wastewater using carbon dioxide gas according to a second embodiment of the present invention.
6 is a block diagram illustrating a control flow of an apparatus for neutralizing alkaline wastewater using carbon dioxide gas according to a second embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration and operation according to the embodiment of the present invention will be described in detail. The following description is one of several aspects of the present invention that is claimable, and the following description may form a part of the detailed description of the present invention. However, in describing the present invention, detailed descriptions of known configurations or functions may be omitted for clarity of the present invention.

The present invention is capable of making various changes and may include various embodiments, and specific embodiments are illustrated in the drawings and described in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In addition, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another. When it is said that a component is 'connected' or 'connected' to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in between. it should be The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

1 is a block diagram illustrating an apparatus for neutralizing alkaline wastewater using carbon dioxide gas according to a first embodiment of the present invention.

As shown in FIG. 1 , the neutralization treatment apparatus 10 for alkaline wastewater according to the first embodiment of the present invention includes a wastewater supply tank 100 , a gas tank 200 , a gas-liquid contact unit 300 , and a reactor ( 400) may be included.

Specifically, the wastewater supply tank 100 may provide the wastewater to be neutralized (eg, alkaline wastewater) to the gas-liquid contact unit 300 . The wastewater supply tank 100 may be provided in the form of a tank in which a predetermined capacity of wastewater can be stored. In the present embodiment, the wastewater supply tank 100 is provided in the form of a water tank, but is not limited thereto, and may be changed to various types capable of supplying wastewater to the gas-liquid contact unit 300 .

The wastewater supply tank 100 may supply wastewater to the gas-liquid contact unit 300 through the first supply pipe 101 and the second supply pipe 102 . In this case, the supply pump 110 may be provided between the first supply pipe 101 and the second supply pipe 102 . The supply pump 110 may provide a supply pressure for moving the wastewater from the wastewater supply tank 100 to the gas-liquid contact unit 300 .

The gas tank 200 may include a tank capable of storing carbon dioxide gas. The gas tank 200 may be provided with a gas valve (not shown) for controlling the discharge flow rate of carbon dioxide gas and a gas compressor (not shown) for adjusting the discharge pressure of carbon dioxide gas. Since these gas valves and gas compressors correspond to conventional configurations of gas valves and gas compressors applied to a gas tank to control a gas supply flow rate and supply pressure, a detailed description thereof will be omitted. The gas tank 200 may move the carbon dioxide gas to the gas-liquid contact unit 300 through the gas pipe 103 .

FIG. 2 is a block diagram illustrating a gas-liquid contact unit of an apparatus for neutralization treatment of alkaline wastewater using carbon dioxide gas according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view showing the line "AA" of FIG. .

2 to 3 , the gas-liquid contact unit 300 may receive wastewater W and carbon dioxide gas G from the wastewater supply tank 100 and the gas tank 200 , and the supplied wastewater (W) and carbon dioxide gas (G) can be contacted effectively.

The gas-liquid contact unit 300 is a turning moving pipe 310 that provides a movement path for wastewater W and carbon dioxide gas G, and a contact protrusion for increasing the contact area between wastewater W and carbon dioxide gas G 320 may be included.

The orbiting moving pipe 310 may be provided in the form of a cylindrical pipe. A gas inlet 311 through which the carbon dioxide gas (G) flows may be formed at the lower end of the orbiting pipe 310 . A wastewater inlet 312 through which the wastewater W flows may be formed on the sidewall of the orbiting pipe 310 . At the upper end of the orbiting pipe 310, a turning outlet 313 through which wastewater (W) and carbon dioxide gas (G) are mixed and discharged may be formed. The gas inlet 311 of the orbiting moving pipe 310 may be connected to the gas pipe 103 , the wastewater inlet 312 may be connected to the second supply pipe 102 , and the orbiting outlet 313 may be connected to the third supply pipe 104 . can be connected with

The contact protrusion 320 includes a pillar portion 321 extending in a vertical direction from the inner surface of the orbiting pipe 310, and an extension portion ( 322) may be included.

In addition, the contact protrusion 320 may be provided in plurality from the inner surface of the orbiting moving pipe 310 toward the mixing outlet 313 in a spiral spaced apart arrangement. Accordingly, while the wastewater W is moved inside the orbiting moving pipe 310 , it collides with the extension 322 of the contact protrusion 320 and can be in contact with the carbon dioxide gas G more effectively.

In this embodiment, the contact protrusion 320 is shown in a mushroom shape as in FIGS. 2 and 3, but is not limited thereto, and the form (shape) of the contact protrusion 320 is wastewater (W) and carbon dioxide gas ( G) can be changed into various shapes (shapes) to increase the contact area between them. The gas-liquid contact unit 300 may move wastewater W and carbon dioxide gas G to the reactor 400 through the third supply pipe 104 .

4 is a block diagram illustrating a reactor of an apparatus for neutralization treatment of alkaline wastewater using carbon dioxide gas according to an embodiment of the present invention.

As shown in FIG. 4 , the reactor 400 may induce cavitation by changing the flow direction by making the wastewater discharged from the gas-liquid contact unit 300 collide with the collision plate 430 .

To this end, the reactor 400 includes a reactor 410, an input pipe 420 for guiding wastewater to the lower inside of the reactor 410, and the lower end of the input pipe 420 so that cavitation is induced through collision with the wastewater. It includes a collision plate 430 spaced apart from each other, a discharge pipe 440 for discharging wastewater accommodated in the reaction tank 410 to the outside, and a cleaning pipe 450 for supplying washing water to the inner space of the reaction tank 410. can do.

The reaction tank 410 may provide an internal space in which cavitation is induced by changing a flow direction through collision with wastewater. An input pipe 420 to which the third supply pipe 104 is connected may be provided at the upper end of the reaction tank 410 . In this case, the connection structure 104a of the third supply pipe 104 connected to the input pipe 420 may be in the form of a venturi pipe. In the connection structure 104a of the third supply pipe 104 , the venturi effect in which the pressure is lowered as the speed of wastewater and carbon dioxide is increased occurs, so that the wastewater and carbon dioxide are connected to the connection structure of the third supply pipe 104 . It can be mixed evenly while moving (104a).

The input pipe 420 may provide a flow space for wastewater and carbon dioxide to flow. The input pipe 420 may be provided in the form of a pipe extending from the upper end of the reaction tank 410 to the inner lower side of the reaction tank 410 . The input pipe 420 may guide wastewater and carbon dioxide supplied from the third supply pipe 104 to the lower inside of the reaction tank 410 . The collision plate 430 may be disposed to be spaced apart from the outlet of the lower end of the input pipe 420 by a predetermined distance.

The collision plate 430 may induce cavitation through collision with wastewater discharged from the input pipe 420 and carbon dioxide gas. The collision plate 430 may be configured to reverse the flow of wastewater discharged from the input pipe 420 .

The collision plate 430 may include a collision portion 431 disposed to face the outlet of the input pipe 420 , and a side wall portion 432 . The collision part 431 may extend in a direction transverse to the input pipe 420 and the extending direction. The side wall part 432 may extend in a direction parallel to the direction in which the input pipe 420 extends from the edge of the collision part 431 . The cross-sectional area of the space between the side wall part 432 and the input pipe 420 may be smaller than the cross-sectional area of the flow space inside the input pipe 420 . In addition, the space between the outlet of the input pipe 420 and the collision part 431 so that wastewater and carbon dioxide gas flow faster between the collision plate 430 and the outlet of the input pipe 420 than inside the input pipe 420 . The longitudinal cross-sectional area of may be smaller than the internal cross-sectional area of the input pipe 420 .

Cavitation can be understood as a 'cavitation phenomenon' in which cavities in a fluid (wastewater) are generated due to a change in pressure caused by a change in fluid velocity. When a cavity is created in the wastewater in the reaction tank 410 by cavitation, the contact area between the wastewater and the carbon dioxide gas may be increased, so that the carbon dioxide gas dissolution rate in the wastewater may be improved.

5 is a block diagram illustrating an apparatus for neutralizing alkaline wastewater using carbon dioxide gas according to a second embodiment of the present invention, and FIG. It is a block diagram showing the control flow of the device.

5 to 6 , the neutralization treatment apparatus 10 for alkaline wastewater according to the second embodiment of the present invention includes a wastewater supply tank 100 , a gas tank 200 , and a gas-liquid contact unit 300 . , a reactor 400 , a gas recycling line 500 , a recycling valve 700 , a first gas sensor 610 , a second gas sensor 620 , and a controller 800 . Since the configuration of the neutralization processing apparatus according to the second embodiment is generally similar to that of the neutralization processing apparatus described in the first embodiment, the differences will be mainly described. For the same configuration, the description and reference numerals of the first embodiment are used. .

The gas recycling line 500 may re-inject the carbon dioxide gas in the reactor 400 to the inlet side of the gas-liquid contacting unit 300 , more specifically, the second supply pipe 102 connected to the inlet side of the gas-liquid contacting unit 300 . . In this case, the gas recycling line 500 may be connected to the second supply pipe 102 through the branch pipe 105 . The branch pipe 105 may be understood as a bypass pipe branched from the first supply pipe 101 and connected to the second supply pipe 102 .

The recycle valve 700 may selectively open and close the flow path of the gas recycle line 500 . The recycling valve 700 selectively opens and closes the flow path of the gas recycling line 500 according to the control signal of the controller 800 to re-inject the carbon dioxide gas in the reaction tank 410 to the inlet side of the gas-liquid contact unit 300 . can

The first gas sensor 610 may be provided in the gas tank 200 . The first gas sensor 610 may measure an input carbon dioxide gas concentration of carbon dioxide gas provided from the gas tank 200 . The input carbon dioxide gas concentration may be understood as the carbon dioxide gas concentration (mg/L) of the carbon dioxide gas provided from the gas tank 200 to the gas-liquid contact unit 300 .

The second gas sensor 620 may be installed in the reactor 400 . The second gas sensor 620 may measure the carbon dioxide concentration emitted from the carbon dioxide gas discharged from the reactor 400 . The discharged carbon dioxide concentration may be understood as the carbon dioxide concentration (mg/L) of carbon dioxide gas remaining in the internal space of the reactor 400 because it is not dissolved in the wastewater of the reactor 400 .

Data on the carbon dioxide concentration of the carbon dioxide gas measured by the first gas sensor 610 and the second gas sensor 620 may be applied to the controller 800 .

The controller 800 is configured to neutralize the wastewater (alkaline wastewater) to neutralize the wastewater supply tank 100, the gas tank 200, the reactor 400, the first gas sensor 610, and the second gas sensor ( 620 ) and one or more of the recycle valve 700 may be controlled. The controller 800 may be implemented by an arithmetic device including a microprocessor, a memory, and the like, and since the implementation method is obvious to those skilled in the art, further detailed description thereof will be omitted.

The controller 800 may calculate the carbon dioxide gas dissolution rate in the wastewater by using the input carbon dioxide gas concentration and the exhaust carbon dioxide gas concentration. The carbon dioxide gas dissolution rate can be calculated through Equation 1 below.

[Equation 1]

When the carbon dioxide gas dissolution rate is calculated through Equation 1, the controller 800 may control the recycle valve 700 so that the calculated carbon dioxide gas dissolution rate reaches a preset target carbon dioxide gas dissolution rate.

For example, when the calculated carbon dioxide gas dissolution rate is lower than a preset target carbon dioxide gas dissolution rate (for example, 95%), the controller 800 transmits a control signal for opening the flow path of the gas recycling line 500 to the recycling valve 700 . ), the carbon dioxide gas discharged from the reactor 400 can be re-injected to the inlet side of the gas-liquid contact unit 300 . Through this, the carbon dioxide gas dissolution rate of the wastewater may be increased.

In addition, when the calculated carbon dioxide gas dissolution rate is lower than the preset target carbon dioxide gas dissolution rate (for example, 95%), the controller 800 calculates the input carbon dioxide gas concentration required for the calculated carbon dioxide gas dissolution rate to reach 95% After that, the input amount of carbon dioxide provided from the gas tank 200 may be increased until the calculated concentration of input carbon dioxide gas is reached. In this case, the concentration of the carbon dioxide gas provided from the gas tank 200 may be measured through the first gas sensor 610 .

As described above, in the present embodiments, by using carbon dioxide gas for neutralization of alkaline wastewater, it is possible to neutralize the alkaline wastewater in an environmentally friendly manner, and the maintenance of the neutralization process of the alkaline wastewater is easy, and carbonic acid that is not dissolved in the reactor There are excellent advantages such as increasing the carbon dioxide dissolution rate of carbon dioxide in wastewater by re-injecting the gas into the gas-liquid contact unit through the gas recycling line.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. you will be able to understand For example, those skilled in the art may change the material, size, etc. of each component according to the field of application, or combine or substitute the embodiments in a form not clearly disclosed in the embodiment of the present invention, but this is also the present invention that does not exceed the scope of Therefore, the embodiments described above should not be understood as illustrative and limiting in all respects, and it should be said that these modified embodiments are included in the technical spirit described in the claims of the present invention.

100: wastewater supply tank 200: gas tank
300: gas-liquid contact unit 310: revolving moving tube
320: contact projection 321: pillar
322: extension 400: reactor
410: reaction tank 420: input tube
430: impact plate 440: exhaust pipe
500: gas recycling line 610: first gas sensor
620: second gas sensor 700: recycle valve
800 : controller

Claims (7)

a wastewater supply tank in which the supply of wastewater is made;
a gas tank providing carbon dioxide;
a gas-liquid contact unit receiving and contacting the wastewater and the carbon dioxide gas;
a supply pump providing a supply pressure to move the wastewater of the wastewater supply tank to the gas-liquid contacting unit, connected to the wastewater supply tank through a first supply pipe, and connected to the gas-liquid contact unit through a second supply pipe;
a reactor for inducing cavitation by changing a flow direction of the wastewater discharged from the gas-liquid contact unit;
a gas recycling line connected to the second supply pipe through a branch pipe to re-inject the carbon dioxide gas in the reactor to the inlet side of the gas-liquid contact unit;
a recycling valve selectively opening and closing a flow path of the gas recycling line;
a first gas sensor for measuring the concentration of carbon dioxide supplied from the gas tank;
a second gas sensor for measuring an exhaust carbon dioxide concentration of carbon dioxide gas discharged from the reactor; and
A carbon dioxide gas dissolution rate is calculated using the input carbon dioxide gas concentration and the exhaust carbon dioxide gas concentration, and when the calculated carbon dioxide gas dissolution rate is lower than a preset target carbon dioxide gas dissolution rate, the carbon dioxide gas discharged from the reactor flows through the gas recycling line and a controller for controlling the recycling valve to be re-injected to the inlet side of the gas-liquid contact unit through
The reactor is
A reaction tank, an input pipe for guiding wastewater to the lower inside of the reactor, and a collision plate spaced apart from the lower end of the input pipe so as to induce cavitation by changing the flow direction of wastewater through collision with the wastewater; A discharge pipe for discharging the wastewater accommodated in the reaction tank to the outside;
The gas-liquid contact unit is
A gas inlet through which carbon dioxide gas flows is formed at a lower end, a waste water inlet through which wastewater flows in is formed on the side wall, and a swirling outlet is formed at the upper end where the wastewater and the carbon dioxide gas are mixed and discharged; the wastewater and and a contact protrusion protruding from the inner surface of the orbiting pipe to increase a contact area between the carbon dioxide gas,
the contact protrusion
A plurality of spirally spaced apart from the inner surface of the orbiting tube toward the outlet is provided,
The collision plate
a collision part disposed opposite the outlet of the input pipe; and a side wall part extending in a direction parallel to a direction in which the input pipe extends from an edge of the collision part; is smaller than the cross-sectional area of the flow space inside the input pipe,
The longitudinal cross-sectional area of the space between the outlet of the input pipe and the collision part is,
smaller than the cross-sectional area inside the input pipe so that wastewater and carbon dioxide gas flow faster between the collision plate and the outlet of the input pipe than inside the input pipe,
Neutralization treatment device for alkaline wastewater using carbon dioxide gas. delete delete delete The method of claim 1,
the contact protrusion
a pillar portion extending in a vertical direction from the inner surface of the orbiting moving tube; and
It is formed at the end of the pillar portion, the expansion portion having a larger diameter than the pillar portion; Containing,
Neutralization treatment device for alkaline wastewater using carbon dioxide gas. delete delete

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