KR20220085169A - Treatment facility and method for muddy water - Google Patents

Abstract

The present invention relates to a sewage treatment facility and a treatment method, and more particularly, to a contaminated water treatment facility, which is solid-liquid separated through a coagulation reaction tank and a first precipitation tank, and then neutralized with carbon dioxide gas through a mixing means It relates to a filthy water treatment facility and treatment method that can achieve more uniform and efficient neutralization while using a small amount of carbon dioxide gas.

Description

Stained water treatment facility and treatment method

The present invention relates to a sewage treatment facility and a treatment method, and more particularly, to a contaminated water treatment facility, which is solid-liquid separated through a coagulation reaction tank and a first precipitation tank, and then neutralized with carbon dioxide gas through a mixing means It relates to a filthy water treatment facility and treatment method that can achieve more uniform and efficient neutralization while using a small amount of carbon dioxide gas.

Tunnels are often constructed in the process of constructing roads, railroads, subways, etc., and the New Austrian Tunneling Method (NATM) method is generally applied to the tunnel excavation method at this time.

This NATM method uses a drill to drill a hole in the rock, load and blast the gunpowder to remove the rock, and then advance while removing the rock. It is a technique to prevent

Drills used in excavating tunnels use excavation water when drilling rock, and after all of this water is used as cooling water, it is discharged to the outside of the site in a state mixed with dust generated during drilling.

In addition, when the shortcrete is poured, the moisture contained in the shortcrete also falls to the floor and is discharged to the outside.

In addition, when excavating through an underground aquifer, groundwater must also be discharged outside the site.

At this time, the above-mentioned various types of water are mostly mixed together and discharged to the outside, which is called excavation wastewater.

Excavation wastewater contains a large amount of suspended substances such as stone dust, and the acidity of the water is about pH 10 or higher, so it should be properly treated and then discharged into public waters.

The excavation wastewater is mostly groundwater and excavation water (about 80%), and shortcrete pouring wastewater constitutes a part.

The high content of suspended solids in the excavation wastewater is due to the mixing of stone dust generated during the drilling process of the jumbo drill and soil in the workshop.

In addition, the pH of the wastewater becomes strong alkalinity by the cement, various admixtures, etc.

In addition, suspended solids are generated by the mixed stone dust and soil, and normal hexane (n-hexane), a pollutant such as oil, is generated by jumbo drills, backhoes, and trucks used during excavation work, and is used for blasting rock. Contaminants such as total nitrogen (T-N) and total phosphorus (T-P) are generated by explosives.

As such, the excavation wastewater generated during tunnel construction has a large amount of suspended substances and strong alkalinity, and an appropriate treatment method must be applied to treat such pollutants.

That is, as a general process for treating excavation wastewater, alkaline wastewater is neutralized, and a large amount of suspended matter is removed by gravity precipitation using chemicals or the like.

As described above, sulfuric acid is generally used to neutralize wastewater. However, when a strong acid such as sulfuric acid is used, there is a problem in that the equipment is corroded and there is a risk of handling.

In addition, in the prior art, since a neutralization reaction tank for neutralizing wastewater must be separately installed, there is a problem in that a site for a wastewater treatment facility must be secured as much as an area corresponding thereto.

In addition, there was a problem in that the neutralization efficiency of the wastewater was lowered because the mixing of the carbon dioxide gas and the tunnel excavation wastewater by the mixing means was not performed efficiently.

In addition, in the conventional wastewater treatment facility, equipment had to be put in to treat the precipitated floc after solid-liquid separation, and dredging work had to be performed. The cost of treatment increased, and even after treatment, there was a problem of environmental pollution by leachate. In addition, since the upper part of the sedimentation tank was opened for dredging work, there was a problem in that the use site of the facility increased due to the arrangement of the mechanical facilities in a parallel structure.

On the other hand, as a prior art related to a sewage treatment facility, there is Korean Patent Laid-Open No. 10-2012-0040411.

The present invention is to solve the above problems, and since the filthy water first introduced into the filthy water treatment facility undergoes a solid-liquid separation through the coagulation reaction tank and the first settling tank, and then neutralizes with carbon dioxide through a mixing means, a small amount of An object of the present invention is to provide a filthy water treatment facility and a treatment method that can make neutralization more uniform and efficient while using carbon dioxide and can reduce the area used by the site by omitting the neutralization tank.

The problems to be solved by the present invention are not limited to the above problems, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description.

In order to achieve the above object, there is provided a sewage treatment facility according to the present invention, comprising: a flocculation reactor for generating flocs by growing the size of suspended substances contained in contaminated water; a first sedimentation tank for generating primary treated water by gravity-precipitating flocs included in filthy water to separate solid-liquid; a flow rate control tank for transferring the primary treated water separated from solid-liquid in the first sedimentation tank while maintaining a constant flow rate and water quality; a liquefied carbon dioxide gas injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled; a gas regulator installed at one end of the liquefied carbon dioxide injection pipe to vaporize the liquefied carbon dioxide and adjust the pressure of the vaporized carbon dioxide; a carbon dioxide gas injection line through which carbon dioxide gas whose pressure is adjusted in the gas regulator is transferred, and in which one or more opening/closing valves are installed; a wastewater injection line in the form of a pipe through which the primary treated water in the flow rate control tank is transferred; a first mixing means in which the carbon dioxide gas transferred through the carbon dioxide gas injection line and the primary treated water transferred through the wastewater injection line are injected and first mixed while passing; a first transfer line in the form of a tube through which the primary treated water mixed primarily in the first mixing means is transferred; a second mixing means in which the primary treated water transferred through the first transfer line is injected and mixed secondly while passing; a second transfer line in the form of a tube through which the primary treated water mixed secondarily in the second mixing means is transferred; a second sedimentation tank for generating secondary treated water by gravity-precipitating flocs included in the primary treated water transferred through the second transfer line to separate solid-liquid; and a discharge tank for discharging the secondary treated water generated in the second settling tank into public waters.

In this case, the first settling tank and the second settling tank may include a sludge pump for transferring the flocs deposited at the lower ends of the first and second settling tanks; and a dehydrator that dehydrates and cakes the flocs transferred through the sludge pump.

Here, by configuring at least one upper part of the first settling tank, the second settling tank, the coagulation reaction tank, and the flow rate adjusting tank in a closed form, and raising the mechanical equipment to form a multi-layer structure, the area used on the site can be reduced.

In addition, the first mixing means may include a chamber having a fixed bar fixed therein; and a plurality of mixing blades fixedly formed to be spaced apart from each other at regular intervals on the fixing bar.

In addition, the mixing wing, a plurality of wing portions formed in a twisted shape; and a fluid flow passage formed between the plurality of wing portions to rotate the fluid passing therethrough.

In addition, the mixing blade is formed in a shape in which each of the wing parts of the adjacent mixing blades are twisted in opposite directions to each other, so that carbon dioxide gas and the primary treated water pass through the fluid flow passage of each mixing blade, and rotate in a predetermined cycle direction It is characterized in that it is switched in the opposite direction.

In addition, a partition wall for reducing the rotation speed of the primary treated water and carbon dioxide gas is formed at the upper end of the wing portion of the mixing blade, and the partition wall is inclined in a direction facing the rotation direction of the carbon dioxide gas and the primary treated water It is characterized in that it is formed in the shape.

Meanwhile, the method for treating filthy water according to the present invention for achieving the above object includes a first step of reacting filthy water first introduced in a flocculation tank with a flocculating agent to generate flocs; a second step of gravity precipitating flocs included in the filthy water in the first sedimentation tank to separate solid and liquid to produce primary treated water; a third step of transferring the primary treated water generated by solid-liquid separation in the first settling tank in the flow rate adjustment tank through a wastewater injection line; a fourth step of vaporizing liquefied carbon dioxide in a gas regulator installed at one end of a liquefied carbon dioxide injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled, and adjusting the pressure of the vaporized carbon dioxide; a fifth step of transferring the carbon dioxide gas whose pressure is adjusted in the gas regulator through a carbon dioxide gas injection line in the form of a tube in which one or more on-off valves are installed; a sixth step of first mixing carbon dioxide gas transferred through the carbon dioxide gas injection line and primary treated water transferred through the wastewater injection line into a first mixing means; a seventh step of transferring the primary treated water firstly mixed in the first mixing means through a first transfer line in the form of a tube; an eighth step of injecting the primary treated water transferred through the first transfer line into a second mixing means and secondly mixing; a ninth step of transferring the primary treated water secondarily mixed in the second mixing means to a second sedimentation tank through a second transfer line in the form of a tube; a 10th step of generating secondary treated water by gravity-precipitating flocs included in the primary treated water in the second sedimentation tank to separate solid and liquid; and an 11th step of discharging the secondary treated water generated in the second settling tank from the discharge tank to public waters.

In this case, the flocs deposited at the lower ends of the first and second settling tanks in the second and tenth steps are transferred to a dehydrator through a sludge pump to perform dehydration cake treatment.

In the sewage treatment facility and method according to the present invention, the sewage water first introduced into the sewage treatment facility undergoes a solid-liquid separation through the coagulation reaction tank and the first settling tank, and then neutralizes with carbon dioxide through a mixing means. It is possible to achieve more uniform and efficient neutralization while using carbon dioxide gas.

In addition, by providing a sludge pump and a dehydrator for treating the flocs deposited after solid-liquid separation in the first and second sedimentation tanks, the dredging operation can be omitted and the flocs are dehydrated and caked through the dehydrator. By minimizing the moisture content, it is possible to minimize the cost of treating flocs, and it is possible to prevent environmental pollution caused by leachate.

In addition, by providing a sludge pump and a dehydrator, the dredging operation can be omitted, and the upper end of the facility such as the settling tank can be configured in a closed form.

In addition, since relatively clean primary treated water from which foreign substances have been removed is supplied to the first and second mixing means for neutralizing contaminated water, the efficiency of the neutralization reaction is significantly improved, and the neutralization reaction tank can be omitted without separately installing it. It has the effect of minimizing the site area for installing a sewage treatment facility.

In addition, provided with a first mixing means composed of a plurality of mixing blades, each of the blades constituting the mixing blades is formed in a twisted shape from the top to the bottom, so that the fluid can be rotated between the respective blades twisted structure The fluid flow passage of the can be formed so that the primary treated water and the carbon dioxide gas introduced into the first mixing means are efficiently mixed while rotating through the fluid flow passage.

In addition, a plurality of mixing blades are provided to be spaced apart at regular intervals, and the wing portions of the adjacent mixing blades are formed in a shape twisted in opposite directions, so that the fluid flow passages of the adjacent mixing blades are twisted in opposite directions. The mixing efficiency of primary treated water and carbon dioxide can be improved by rotating while the direction of rotation is switched to the opposite direction whenever water and carbon dioxide pass through the fluid flow passage of each mixing blade.

In addition, since the plurality of mixing blades are provided to be spaced apart from each other at regular intervals, the time during which the primary treated water and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas can be sufficiently dissolved in the primary treated water.

In addition, by forming a partition wall to block the rotation of the primary treated water and carbon dioxide gas at the upper end of each wing constituting the mixing blade, the rotation speed is reduced, thereby increasing the time for mixing the primary treated water and carbon dioxide gas, As the partition wall blocks the rotation of the primary treated water and carbon dioxide gas to reduce the rotation speed, the pressure of the fluid mixed with the primary treated water and carbon dioxide gas is increased, so that a greater amount of carbon dioxide is dissolved in the primary treated water It is possible to improve the neutralization efficiency.

In addition, the partition wall is formed to be inclined by a certain angle in the direction facing the rotational direction of the primary treated water and the carbon dioxide gas, thereby further increasing the effect of reducing the rotational speed of the primary treated water and the carbon dioxide gas and increasing the pressure have.

In addition, the present invention uses liquefied carbon dioxide as a neutralizing agent in place of strong acids, which are prohibited from being used as hazardous chemicals, thereby ensuring the safety of sewage treatment and neutralizing alkaline wastewater more efficiently. .

In addition, the present invention has an effect of more uniformly and efficiently neutralization by first mixing tunnel excavation wastewater and carbon dioxide gas in the first mixing means and then secondary mixing in the second mixing means.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a sewage treatment facility according to a preferred embodiment of the present invention.
2 is a view showing a state in which mechanical equipment is formed in a multi-layer structure in a filthy water treatment facility according to a preferred embodiment of the present invention.
3 is a view showing the shape of the mixing blade included in the sewage treatment facility according to another preferred embodiment of the present invention.
4 is a schematic view for explaining the effect of the partition wall formed on the mixing blade included in the filthy water treatment facility according to another preferred embodiment of the present invention.
5 is a schematic diagram showing the form of the first mixing means included in the sewage treatment facility according to another preferred embodiment of the present invention.

A preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings, but already known technical parts will be omitted or compressed for the sake of brevity of description.

Hereinafter, with reference to the accompanying drawings, a filthy water treatment facility and method according to a preferred embodiment of the present invention will be described in detail.

1 is a view showing a filthy water treatment facility according to a preferred embodiment of the present invention, and FIG. 2 is a view showing a state in which mechanical equipment is formed in a multi-layered structure in the filthy water treatment facility according to a preferred embodiment of the present invention. .

1 and 2, the sewage treatment facility according to a preferred embodiment of the present invention is a coagulant supply pump 100 for generating primary treated water by first precipitating and separating suspended substances contained in contaminated water. ), a coagulant storage tank 101 , a coagulation reaction tank 200 , a first settling tank 300 and a flow rate adjustment tank 400 , and a liquefied carbon dioxide injection pipe for neutralizing the primary treated water from which suspended substances are primarily precipitated and separated (10), the gas regulator 20, the carbon dioxide gas injection line 30, the wastewater injection line 40, the first mixing means 50, the first transfer line 60, the second mixing means 70 and the second The second transfer line 80 and the second sedimentation tank 500 and the discharge tank 600 for discharging the suspended substances contained in the primary treated water on which the neutralization reaction has been completed are secondarily precipitated and separated.

The coagulant supply pump 100 and the coagulant storage tank 101 serve to supply a coagulant (aluminum sulfate, polymer) to the coagulation reactor 200 through the first coagulant supply line 102 . In addition, the coagulant is supplied to the primary treated water that is connected to the wastewater injection line 40 through the second coagulant supply line 103 and is transferred to the first mixing means 50 .

The flocculation reactor 200 uses the flocculating agent supplied from the flocculating agent supply pump 100 and the flocculating agent storage tank 101 to grow the size of suspended matter contained in the filthy water to generate flocs.

The first settling tank 300 performs a process of obtaining primary treated water by gravity-precipitating flocs included in filthy water to separate solid-liquid. At this time, the sludge pump 302 and the dehydrator 303 are connected to the first settling tank 300 through the first plug transfer line 301 , and thus the solid-liquid is separated from the filthy water at the lower end of the first settling tank 300 . After the precipitated flocs are transferred through the first floc transfer line 301 using the sludge pump 302 , the flocs may be dehydrated and caked using the dehydrator 303 . The dehydrated cake treated as described above can be recycled or buried, and since the moisture content is within 85%, the treatment cost can be minimized, and the problem of environmental pollution by leachate does not occur. In addition, the dehydration filtrate generated by dehydration is transferred to a flow rate adjustment tank 400 to be described later.

The flow rate adjustment tank 400 maintains a constant flow rate and water quality of the primary treated water separated from solid-liquid in the first sedimentation tank 300 and transfers it to the wastewater injection line 40 through the filthy water transfer pump 401 . .

The liquefied carbon dioxide gas injection pipe 10 has a predetermined length, and a plurality of portable small liquefied carbon dioxide gas tanks T of about 40 kg provided along the longitudinal direction are detachably coupled.

It is preferable that the liquefied carbon dioxide gas injection pipe 10 is provided in plurality and arranged in parallel.

In addition, a pressure gauge P is installed in the plurality of liquefied carbon dioxide gas injection pipes 10, respectively. At this time, the plurality of liquefied carbon dioxide gas injection pipes 10 arranged in parallel have a carbon dioxide gas injection line 30 to be described later, respectively. connected

The gas regulator 20 is installed at one end of the liquefied carbon dioxide injection pipe 10 to vaporize the liquefied carbon dioxide gas, and to adjust the pressure of the vaporized carbon dioxide gas.

The carbon dioxide gas injection line 30 is formed in the form of a tube in which one or more on-off valves V1 are installed, and the carbon dioxide gas whose pressure is adjusted in the gas regulator 20 is transferred to the first mixing means 50 to be described later. to be.

On the other hand, a plurality of liquefied carbon dioxide gas injection pipes 10 arranged in parallel are each connected to a carbon dioxide gas injection line 30 , and an on/off valve V1 is installed in the plurality of carbon dioxide gas injection lines 30, respectively, and a plurality of When the pressure of any one of the liquefied carbon dioxide injection pipe 10 of the liquefied carbon dioxide injection pipe 10 of It is made to open the on-off valve (V1) installed in the carbon dioxide gas injection pipe (10).

The on/off valve V1 is preferably a solenoid valve.

At this time, the main carbon dioxide gas injection line 31 of any one of the plurality of carbon dioxide gas injection lines 30 is connected to a first mixing means 50 to be described later, and the main carbon dioxide gas among the plurality of carbon dioxide gas injection lines 30 . The remaining carbon dioxide gas injection lines 32 excluding the injection line 31 are branched from the main carbon dioxide gas injection line 31 .

In addition, the main carbon dioxide gas injection line 31 branched from the main carbon dioxide gas injection line 31 and located between the carbon dioxide gas injection line 30 closest to the first mixing means 50 and the first mixing means 50 has An injection valve (V2) is installed.

This injection valve (V2) is preferably made of a solenoid valve.

In addition, a pressure gauge P and an ejector (not shown) may be installed in the main carbon dioxide gas injection line 31 located between the injection valve V2 and the first mixing means 50 .

Since high-pressure wastewater passes through the line static mixer, which is the first mixing means 50, an ejector is required to set carbon dioxide gas at a high pressure to suck it into the high-pressure wastewater.

The wastewater injection line 40 is a line in which the alkaline primary treated water in the flow rate adjusting tank 400 is transferred to the first mixing means 50 because it is formed in a tube shape.

Although not shown in the drawing, a cooling means (not shown) for cooling the wastewater is installed in such a wastewater injection line 40 , and the cooling means (not shown) is in the form of a cooling line surrounding the outer circumferential surface of the wastewater injection line 40 . , or may be implemented in other ways.

As such, by installing a cooling means (not shown) in the wastewater injection line 40 so that the alkaline primary treated water in the flow rate adjustment tank 400 is cooled before being injected into the first mixing means 50, Mixing can be done smoothly.

The first mixing means 50 is primarily mixed with carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the primary treated water transferred through the waste water injection line 40 is injected and passed through, the line static mixer (line static mixer) is preferred, but is not limited thereto.

The first transfer line 60 is a line for transferring the primary treated water firstly mixed in the first mixing means 50 to the second mixing means 70 to be described later, which is formed in a tube shape.

The second mixing means 70 is to be mixed with the primary treated water transferred through the first transfer line 60 is injected and passed through, preferably made of a cyclone mixer 72, but limited thereto In addition to the cyclone mixer 72, it may be formed in various forms, such as a form in which a spring is installed in a hollow tube along the longitudinal direction, a form in which a plurality of propellers are installed in a longitudinal direction in a hollow tube, and the like.

As such, by first mixing the primary treated water and carbon dioxide gas in the first mixing means 50 and then performing the secondary mixing in the second mixing means 70, neutralization can be performed more uniformly and efficiently. there will be In addition, as shown in FIG. 1 , the primary treated water purified while passing through the coagulation reaction tank 200 and the first settling tank 300 is introduced into the first and second mixing means 50 and 70 to perform a neutralization process. Therefore, the efficiency of the neutralization reaction is significantly improved, and the neutralization reaction is mostly completed in the first and second mixing means 50 and 70. Therefore, the neutralization reaction tank can be omitted, thereby minimizing the site area for installing the filthy water treatment facility. can do.

The second transfer line 80 is a line in which the primary treated water secondarily mixed in the second mixing means 70 is transferred to the second settling tank 500 because it is formed in a tube shape.

The second settling tank 500 is a coagulant supply pump 100 in the process of neutralizing reaction while the primary treated water generated by solid-liquid separation in the first settling tank 300 passes through the first and second mixing means 50 and 70 . and a process of obtaining secondary treated water by gravity-precipitating flocs generated by reacting with the coagulant supplied to the wastewater injection line 40 from the coagulant storage tank 101 to separate solid-liquid. At this time, the sludge pump 502 and the dehydrator 503 are connected to the second settling tank 500 through the second plug transfer line 501, and thus the solid-liquid separation from the primary treated water is formed in the second settling tank 500. After the flocs deposited at the bottom are transferred through the second floc transfer line 501 using the sludge pump 502 , the flocs may be dehydrated and caked using the dehydrator 503 . The dehydrated cake treated as described above can be recycled or buried, and since the moisture content is within 85%, the treatment cost can be minimized, and the problem of environmental pollution by leachate does not occur. In addition, the dewatering filtrate generated by dehydration is transferred to the flow rate adjustment tank 400 .

A pH sensor S is installed in the second settling tank 500 and the discharge tank 600 to inject carbon dioxide gas into the first mixing means 50 according to the measured pH value of the secondary treated water (V2) ) is made to automatically control the opening and closing.

The discharge tank 600 is a tank in which the process of discharging secondary treated water to public waters is performed.

Although not shown in the drawing, a control unit (not shown) for controlling the overall configuration of the filthy water treatment facility is separately provided.

On the other hand, as described above, the sludge pumps 302 and 502 and the dehydrators 303 and 503 for treating the precipitated floc after solid-liquid separation in the first settling tank 300 and the second settling tank 500, respectively. By having a dredging operation performed by an excavator, etc., it is possible to omit the dredging operation, so that the upper part of the existing sedimentation tank can be formed in a closed form. In the case of the conventional sedimentation tank, a dredging operation of scooping up foreign substances including soil, gravel, and the like sunk in the sedimentation tank with an excavator had to be performed, but the present invention can omit such a dredging operation.

In addition, the upper portions of the coagulation reaction tank 200 and the flow rate adjustment tank 400 may also be formed in a closed structure. Therefore, since the upper part of these facilities can be formed in a closed structure, some of the mechanical facilities (liquefied carbon dioxide gas tank, coagulant storage tank, coagulant supply pump, first mixing means, second mixing means, etc.) as shown in FIG. The use of facilities can be minimized by raising the building to the second floor and installing it in a two-story structure.

Hereinafter, a method for treating filthy water using a filthy water treatment facility according to the present invention having the above configuration will be described in detail.

First, the filthy water first introduced from the flocculation tank 200 is reacted with a coagulant to grow the size of suspended matter contained in the filthy water to generate flocs, and then flocs are generated in the first settling tank 300 . Primary treated water is obtained by gravity precipitation and solid-liquid separation. At this time, solid-liquid separation from the contaminated water and deposited at the lower end of the first settling tank 300 are transferred to the dehydrator 303 by the sludge pump 302 to be dehydrated caked.

Thereafter, while maintaining the flow rate and water quality of the primary treated water separated from solid-liquid in the first sedimentation tank 300 in the flow rate adjustment tank 400 , it is transferred through the wastewater injection line 40 .

On the other hand, the liquefied carbon dioxide gas is vaporized in the gas regulator 20 installed at one end of the liquefied carbon dioxide gas injection pipe 10 to which a plurality of liquefied carbon dioxide tanks T are detachably coupled, and the pressure of the vaporized carbon dioxide gas is After the adjustment, the carbon dioxide gas whose pressure is adjusted in the gas regulator 20 is transferred through the carbon dioxide gas injection line 30 in the form of a tube in which one or more on-off valves V1 are installed.

As described above, the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the primary treated water transferred through the waste water injection line 40 are injected into the first mixing means 50 and mixed firstly, and the first mixing The primary treated water firstly mixed in the means 50 is transferred through the first transfer line 60 made of a tube shape and injected into the second mixing means 70 to be mixed secondarily.

At this time, in the process of neutralizing reaction while passing the first and second mixing means 50 and 70, the primary treated water generated by solid-liquid separation in the first settling tank 300, the coagulant supply pump 100 and the coagulant storage tank ( 101), the coagulant supplied to the wastewater injection line 40 reacts with the primary treated water to form flocs in the primary treated water.

Thereafter, the secondly mixed primary treated water is transferred to the second sedimentation tank 500 through the second transfer line 80 made of a tube shape, and the flocs are gravity-settled and solid-liquid separated to obtain clean secondary treated water. get At this time, solid-liquid separation from the primary treated water and deposited at the lower end of the second settling tank 500 are transferred to the dehydrator 503 by the sludge pump 502 to be dehydrated caked.

Finally, the wastewater treatment process is terminated by discharging the secondary treated water to the public waters through the discharge tank 600 .

On the other hand, Figure 3 is a view showing the shape of the mixing blade included in the sewage treatment facility according to another preferred embodiment of the present invention, Figure 4 is included in the sewage treatment facility according to another preferred embodiment of the present invention It is a schematic diagram for explaining the effect of the barrier rib formed on the mixing blade, and FIG. 5 is a schematic diagram showing the form of the first mixing means included in the filthy water treatment facility according to another preferred embodiment of the present invention.

Hereinafter, a filthy water treatment facility according to another preferred embodiment of the present invention will be described in detail with reference to Figs.

3 to 5, the filthy water treatment facility according to another preferred embodiment of the present invention includes a chamber 56 and a first first composed of a plurality of mixing blades 51 installed inside the chamber 56. A mixing means (50) is included.

The mixing blade 51 of the first mixing means 50 is fixedly formed so that a plurality of mixing blades 51 are spaced apart from each other at regular intervals on a fixing bar 57 having a fixing part 55 formed at the upper end and the lower end, and a plurality of The fixing bar 57 on which the mixing blades 51 are fixed is installed to be fixed inside the chamber 56 through the fixing parts 55 formed on the upper and lower ends. Since there are various known means for fixing the fixing part 55 to the chamber 56, a detailed description thereof will be omitted.

The mixing blades 51 are each composed of a plurality of wing portions 52, and the plurality of wing portions 52 are formed in a shape twisted from the top to the bottom, respectively, so that a fluid is applied between each of the wing portions 52. A fluid flow passage 53 of a twisted structure that can be rotated is formed, and each of the wing parts 52 of the adjacent mixing blades 51 are twisted in opposite directions to each other, so that the fluid flow of the adjacent mixing blades 51 is formed. The passages 53 are formed in a structure in which they are twisted in opposite directions.

Accordingly, after the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the primary treated water transferred through the waste water injection line 40 are injected into the chamber 56 of the first mixing means 50, each mixing It rotates while passing through the fluid flow passage 53 of the blade 51 , while the rotation direction is switched to the opposite direction according to the twisted direction of the fluid flow passage 53 of each mixing blade 51 .

Specifically, after the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the primary treated water transferred through the wastewater injection line 40 are injected into the chamber 56 of the first mixing means 50, As it passes the fluid flow passage 53 of the upper first mixing blade 51, it rotates in a clockwise direction according to the twisted direction of the fluid flow passage 53, and mixing is made at the installation interval between the mixing blades 51. Mixing is made while continuing to rotate clockwise until it enters the fluid flow passage 53 of the second mixer blade 51 at the top of FIG.

After that, when the primary treated water and carbon dioxide gas enter the fluid flow passage 53 of the upper second mixing blade 51 of FIG. 3, the direction opposite to the direction of rotation according to the twisted direction of the fluid flow passage 53, That is, the rotation direction is changed to the counterclockwise direction to rotate, and then, whenever it passes the fluid flow passage 53 of the mixing blades 51 at the bottom in turn, the rotation direction is switched to the opposite direction and mixing is performed. Therefore, the primary treated water and carbon dioxide gas pass through the plurality of mixing blades 51 and rotate while rotating so that the rotation direction is switched to the opposite direction at a certain period, so that a larger amount of carbon dioxide gas is dissolved in the primary treated water can make it happen

In addition, since the plurality of mixing blades 51 are formed to be spaced apart from each other at regular intervals, the time during which the primary treated water and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas can be sufficiently dissolved in the primary treated water.

At this time, since the outer diameter of the mixing blade 51 is formed close to the inner diameter of the chamber 56 so that the outer surface of the mixing blade 51 can contact the inner surface of the chamber 56, the chamber ( 56) Carbon dioxide gas and primary treated water entering the inside cannot move between the outer surface of the mixing blade 51 and the inner surface of the chamber 56, and only through the fluid flow passage 53 of the mixing blade 51 will move

On the other hand, a partition wall 54 is formed at the upper end of each wing part 52 of the mixing blade 51 formed in the form as described above, and the partition wall 54 prevents the rotation of the primary treated water and carbon dioxide gas. formed in a suitable location for

Specifically, as shown in FIGS. 3 and 4 , a partition wall 54 is formed at the upper end of each wing part 52 of the mixing blade 51 installed at a position where the primary treated water and carbon dioxide gas rotate in a clockwise direction. At the upper end of each wing part 52 of the mixing blade 51 formed at the left end of the drawing of the upper end of each wing part 52, and installed at a position where the primary treated water and carbon dioxide gas rotate in a counterclockwise direction, The partition wall 54 is formed at the right end of the drawing at the upper end of each wing unit 52, and thus each partition wall 54 effectively blocks the rotation of the primary treated water and carbon dioxide gas to reduce the rotation speed. The neutralization efficiency of the primary treated water can be improved by increasing the pressure of the mixed fluid of the primary treated water and carbon dioxide gas so that a larger amount of carbon dioxide is dissolved in the primary treated water.

In addition, each partition wall 54 is inclined by a predetermined angle in the direction opposite to the rotation direction of the carbon dioxide gas and the primary treated water so as to further increase the effect of reducing the rotation speed and increasing the pressure of the primary treated water and the carbon dioxide gas. formed in the form of a photograph.

On the other hand, although the figure shows that four wing parts 52 constituting the mixing wing 51 are formed, the present invention is not limited thereto and the number of wing parts 52 can be variously changed as needed.

As described above, in the contaminated water treatment facility and treatment method according to the present invention, the contaminated water first introduced into the sewage treatment facility goes through the coagulation reaction tank and the first settling tank to separate solid and liquid, and relatively clean primary treated water from which a significant amount of foreign substances is removed is mixed. Since it is supplied by means of a neutralization reaction with carbon dioxide gas, it is possible to achieve more uniform and efficient neutralization while using a small amount of carbon dioxide gas.

In addition, by providing a sludge pump and a dehydrator for treating the flocs deposited after solid-liquid separation in the first and second sedimentation tanks, the dredging operation can be omitted and the flocs are dehydrated and caked through the dehydrator. By minimizing the moisture content, it is possible to minimize the cost of treating flocs, and it is possible to prevent environmental pollution caused by leachate.

In addition, by providing a sludge pump and a dehydrator, the dredging operation can be omitted, and the upper end of the facility such as the settling tank can be configured in a closed form.

In addition, since relatively clean primary treated water flows into the first and second mixing means for neutralizing contaminated water, the efficiency of the neutralization reaction is remarkably improved, and the neutralization reaction is mostly completed in the first and second mixing means, thus Since there is no need to separately install a neutralization tank, there is an effect of minimizing the site area for installing a sewage treatment facility.

In addition, provided with a first mixing means composed of a plurality of mixing blades, each of the blades constituting the mixing blades is formed in a twisted shape from the top to the bottom, so that the fluid can be rotated between the respective blades twisted structure The fluid flow passage of the can be formed so that the primary treated water and the carbon dioxide gas introduced into the first mixing means are efficiently mixed while rotating through the fluid flow passage.

In addition, a plurality of mixing blades are provided to be spaced apart at regular intervals, and the wing portions of the adjacent mixing blades are formed in a shape twisted in opposite directions, so that the fluid flow passages of the adjacent mixing blades are twisted in opposite directions. The mixing efficiency of primary treated water and carbon dioxide can be improved by rotating while the direction of rotation is switched to the opposite direction whenever water and carbon dioxide pass through the fluid flow passage of each mixing blade.

In addition, since the plurality of mixing blades are provided to be spaced apart from each other at regular intervals, the time during which the primary treated water and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas can be sufficiently dissolved in the primary treated water.

In addition, by forming a partition wall to block the rotation of the primary treated water and carbon dioxide gas at the upper end of each wing constituting the mixing blade, the rotation speed is reduced, thereby increasing the time for mixing the primary treated water and carbon dioxide gas, As the partition wall blocks the rotation of the primary treated water and carbon dioxide gas to reduce the rotation speed, the pressure of the fluid mixed with the primary treated water and carbon dioxide gas is increased, so that a greater amount of carbon dioxide is dissolved in the primary treated water It is possible to improve the neutralization efficiency.

In addition, the partition wall is formed to be inclined by a certain angle in the direction facing the rotational direction of the primary treated water and the carbon dioxide gas, thereby further increasing the effect of reducing the rotational speed of the primary treated water and the carbon dioxide gas and increasing the pressure have.

In addition, the present invention has the effect of ensuring safety and more efficiently neutralizing alkaline wastewater by using liquefied carbon dioxide gas as a neutralizing agent without using a strong acid prohibited by law as a hazardous chemical.

In addition, the present invention has an effect of more uniformly and efficiently neutralization by first mixing tunnel excavation wastewater and carbon dioxide gas in the first mixing means and then secondary mixing in the second mixing means.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings, but since the above-described embodiments have only been described with preferred examples of the present invention, the present invention is limited only to the above embodiments It should not be understood as being, and the scope of the present invention should be understood as the following claims and their equivalent concepts.

10: liquefied carbon dioxide gas injection pipe
20: gas regulator
30: carbon dioxide gas injection line
40: wastewater injection line
50: first mixing means
60: first transfer line
70: second mixing means
80: second transfer line
T: Liquefied carbon dioxide tank
P: pressure gauge
S: pH sensor
V1 : on/off valve
V2 : Injection valve
100: coagulant supply pump
101: coagulant storage tank
102: first coagulant supply line
103: second coagulant supply line
200: agglomeration reactor
300: first settling tank
301: 1st flock transfer line
302: sludge pump
303: dehydrator
400: flow control tank
401: dirty water transfer pump
500: second settling tank
501: 2nd flock transfer line
502: sludge pump
503: dehydrator
600: water tank
<Another embodiment>
50: first mixing means
51: mixing wing
52: wing
53: fluid flow path
54: Gyeokbyeok
55 ; fixed part
56: chamber
57: fixed bar

Claims (9)

a flocculation reactor for generating flocs by growing the size of suspended substances contained in filthy water;
a first sedimentation tank for generating primary treated water by gravity-precipitating flocs included in filthy water to separate solid-liquid;
a flow rate control tank for transferring the primary treated water separated from solid-liquid in the first sedimentation tank while maintaining a constant flow rate and water quality;
a liquefied carbon dioxide gas injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled;
a gas regulator installed at one end of the liquefied carbon dioxide injection pipe to vaporize the liquefied carbon dioxide and adjust the pressure of the vaporized carbon dioxide;
a carbon dioxide gas injection line through which carbon dioxide gas whose pressure is adjusted in the gas regulator is transferred, and in which one or more opening/closing valves are installed;
a wastewater injection line in the form of a pipe through which the primary treated water in the flow rate control tank is transferred;
a first mixing means in which the carbon dioxide gas transferred through the carbon dioxide gas injection line and the primary treated water transferred through the wastewater injection line are injected and first mixed while passing;
a first transfer line in the form of a tube through which the primary treated water mixed primarily in the first mixing means is transferred;
a second mixing means in which the primary treated water transferred through the first transfer line is injected and mixed secondly while passing;
a second transfer line in the form of a tube through which the primary treated water mixed secondarily in the second mixing means is transferred;
a second sedimentation tank for generating secondary treated water by gravity-precipitating flocs included in the primary treated water transferred through the second transfer line to separate solid-liquid; and
Stained water treatment facility comprising a; a discharge tank for discharging the secondary treated water generated in the second settling tank into public waters.
According to claim 1,
In the first settling tank and the second settling tank,
a sludge pump for transferring the flocs deposited at the lower ends of the first and second settling tanks; and
Stained water treatment facility, characterized in that it is provided with; a dehydrator for treating the flocs transferred through the sludge pump to dehydrate cake.
3. The method of claim 2,
At least one upper part of the first settling tank, the second settling tank, the coagulation reaction tank and the flow rate adjusting tank is configured in a closed form, and the mechanical equipment is raised to form a multi-layered structure, thereby reducing the area of use of the site. sewage treatment facility.
According to claim 1,
The first mixing means,
A chamber having a fixed bar fixed therein; and
Stained water treatment facility comprising a; a plurality of mixing blades fixedly formed to be spaced apart from each other at regular intervals on the fixed bar.
5. The method of claim 4,
The mixing blade,
A plurality of wings formed in a twisted shape; and
Stained water treatment facility comprising a; a fluid flow passage formed between the plurality of blades to rotate the passing fluid.
6. The method of claim 5,
The mixing blade,
Each of the wing portions of the adjacent mixing blades are formed in a shape twisted in opposite directions, so that the carbon dioxide gas and the primary treated water pass through the fluid flow passage of each mixing blade, and the rotation direction is switched to the opposite direction at a certain period Stained water treatment facility characterized by.
6. The method of claim 5,
A partition wall for reducing the rotation speed of the primary treated water and carbon dioxide gas is formed at the upper end of the wing part of the mixing blade;
The bulkhead is a polluted water treatment facility, characterized in that it is formed in a shape inclined in a direction facing the rotational direction of carbon dioxide gas and the primary treated water.
A first step of generating flocs by reacting the first introduced filthy water from the coagulation tank with a coagulant;
a second step of gravity precipitating flocs included in the filthy water in the first sedimentation tank to separate solid and liquid to produce primary treated water;
a third step of transferring the primary treated water generated by solid-liquid separation in the first settling tank in the flow rate adjustment tank through a wastewater injection line;
a fourth step of vaporizing liquefied carbon dioxide in a gas regulator installed at one end of a liquefied carbon dioxide injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled, and adjusting the pressure of the vaporized carbon dioxide;
a fifth step of transferring the carbon dioxide gas whose pressure is adjusted in the gas regulator through a carbon dioxide gas injection line in the form of a tube in which one or more on-off valves are installed;
a sixth step of first mixing carbon dioxide gas transferred through the carbon dioxide gas injection line and primary treated water transferred through the wastewater injection line into a first mixing means;
a seventh step of transferring the primary treated water firstly mixed in the first mixing means through a first transfer line in the form of a tube;
an eighth step of injecting the primary treated water transferred through the first transfer line into a second mixing means and secondly mixing;
a ninth step of transferring the primary treated water secondarily mixed in the second mixing means to a second sedimentation tank through a second transfer line in the form of a tube;
a 10th step of generating secondary treated water by gravity-precipitating flocs included in the primary treated water in the second sedimentation tank to separate solid and liquid; and
The 11th step of discharging the secondary treated water generated in the second settling tank from the discharge tank to public waters;
9. The method of claim 8,
Stained water treatment method, characterized in that the flocs deposited at the lower ends of the first and second settling tanks in the second and tenth steps are transferred to a dehydrator through a sludge pump for dehydration cake treatment.

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