KR20150109551A - Process and plant for wastewater treatment - Google Patents

Abstract

The present invention relates to a wastewater treatment method and a treatment apparatus thereof, which is improved to minimize an offensive odor generated in an antifoaming process of bubbles, by discharging to a lower part of an aeration tank, reintroducing bubbles to the inside of the aeration tank, and being melted into water, after inhaling bubbles on the water surface generated in an air aeration process in an aerobic atmosphere of wastewater by inhalation force of a pump. The wastewater treatment method of the present invention comprises: an introduction step for introducing and storing inflow water which is wastewater in a flow rate control tank; an aeration step for degrading organic matter by infusing air inside each aeration tank, while gradually transporting the inflow water to the inside of the aeration tanks having each of the air diffusers step by step; a bubble introduction step for discharging again to the lower parts of each of the aeration tanks by inhaling bubbles on the water surface generated by air aeration in the aeration step by inhalation force of the pump; and a treatment step for treating the treatment water fermented through the bubble introduction step in a final treatment tank.

Description

TECHNICAL FIELD [0001] The present invention relates to a wastewater treatment method,

The present invention relates to a wastewater treatment method and a treatment apparatus therefor, and more particularly to a wastewater treatment apparatus and a treatment apparatus therefor, which are capable of returning bubbles on a water surface generated by air aeration to an aerobic tank or a bottom of a final treatment tank, Gas, and foam to circulate the water treatment process again through the flow rate control tank, thereby minimizing the generation of odor discharged into the atmosphere, and a treatment apparatus therefor.

Activated sludge method is generally used as a treatment method of organic wastewater. The activated sludge method is adopted for the secondary treatment of the primary treated wastewater or for the aerobic complete treatment of the wastewater not subjected to the primary treatment Method.

Conventionally, a method of supplying oxygen by installing an acid organs in an oxic tank is generally used in an operation for the treatment of livestock manure or sewage. In this case, an agitation facility is required to increase the distribution efficiency so as to uniformly distribute oxygen in the oxic tank.

However, the conventional agitation facility is mostly propeller type, which is disadvantageous in that it is not easy to install, and the manufacturing cost is high due to the difficulty of the operation.

In order to efficiently purify wastewater and livestock wastewater, it is important that such aerobic fermentation treatment actively and actively contact air and water to increase the contact area between air bubbles and wastewater to increase the solubility of air.

When oxygen is supplied to the organic wastewater by aeration to melt it, nitrate is produced by aerobic fermentation which promotes biochemical reactions such as oxidation of organic substances and digestion by aerobic bacteria.

However, in the conventional wastewater treatment system, when the aeration by the oxygen supply is performed through the acid ore, a large amount of oxidation and bubbles due to the microorganism activity may occur, resulting in overflowing out of the oxic tank. However, since the oxidized foam has a high viscosity, it is not easy to remove the foam.

The problems caused by existing bubbles are as follows.

1) Discontinuity of treatment process

2) Loss of biosolid liquid flow through bypass

3) Pollution around

4) shortening the life expectancy of the machine parts of the reactor

5) difficult situations in controlling key parameters such as pH, temperature, oxidation-reduction value, ventilation level, motor speed due to bubble

6) there is a disadvantage of delays in the entire process which adversely affect the continuous automatic processing system.

An example of a conventional wastewater treatment system is disclosed in Korean Patent Publication No. 10-0549368 entitled "Circulating Sewage and Wastewater Treatment Apparatus and Treatment Method (Date of Registration: 2006.01.27) And aeration step in which aeration treatment is performed in a plurality of aeration tanks in which the polluted water having been settled in the anoxic tank is introduced and air supplied from an air supply source is subjected to aeration treatment, A step of purging the aeration water treated in the recovery step and purging the aeration water treated in the recovery step to recover the purged water in the aeration tank through the recovery flow path, A drainage step for draining the purified water filtered by the filter through the drainage passage, Ratio and, after stored in a pressure pump the purified water filtered by the filter is equipped with a backwash step for removing foreign matter to flow back to the filter attached to the filter.

As another prior art, as described in Korean Patent No. 10-0235196, entitled " Apparatus And Method For Processing Organic Waste "(Date of Registration: Sep. 21, 1999), a screening step of sorting the collected organic wastes by size and weight A pre-treatment step of adjusting the pH adjustment to be a proper fermentation condition according to a pH measurement value measured by a pH meter at a predetermined time unit by a pH adjuster, the organic wastes being mixed by the agitator of the selected organic wastes sorted in the selection step, : Aeration function of the aeration pump that forcibly supplies external air to the inside in the state where organic wastes adjusted to a predetermined pH value by the preprocessing step are filled in the tank, and the suspended solids and refractory organic matter suspended in the fermentation process Aeration step to float upwards; and a high-temperature bubble floated in this aeration step to be delivered to the motor-driven propeller The water contained in the foam is vaporized by the fermentation heat and the gas generated at this time is collected by the gas collection tank to obtain the liquid ratio.

However, in order to remove the aforementioned bubbles, a mechanical defoaming device such as a rotating blade, a liquid defoamer using its own biosolid liquid waste stream, or tap water have been introduced for defoaming.

The fundamental principle of these conventional defoamers is that they physically rupture the bubble droplets and convert them from foam to liquid. This is somewhat effective for small quantities of bubbles, but not for large amounts of viscous bubbles.

Therefore, process results are often unsatisfactory, and mechanical defoamers require high-intensity equipment repair, high energy costs, and frequent machine inspection. In particular, periodic replacement of moving parts such as blades and motors, and maintenance of high-strength equipment such as periodic cleaning procedures due to severe corrosion problems have become a major concern

In addition, there is a disadvantage in that the volume is increased due to facilities such as an aeration tube, a stirring facility, a foam removal device, and the like installed in the aerobic tank process for wastewater treatment, thereby increasing the size and cost of the installation site.

In addition, the existing aerobic tank generates a large amount of gas (ammonia) during the digestion process. After the ammonia gas floats to the surface of the water and flows out to the atmosphere or floats on the surface in the state of being contained in the foam, The gas is released to the inside, which causes a bad odor.

Korean Patent Registration No. 10-0549368 entitled "Circulating Sewage and Wastewater Treatment Apparatus and Treatment Method (Registration Date: Jan. 27, 2006) Korean Patent No. 10-0235196 "Apparatus and method for treating organic waste" (registered on September 21, 1999)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to solve the above problems, and to provide a method and apparatus for recovering ammonia gas from an aerobic digestion process, And to provide an improved wastewater treatment method and apparatus therefor.

According to an aspect of the present invention, there is provided a method for controlling a flow rate of a wastewater, comprising: an inflow step of inflowing and storing inflow water such as wastewater into a flow rate control tank; A bubble inflow step of sucking bubble and noxious gas on the water surface generated by air aeration in the aeration step by the suction force of the pump and discharging it back to the lower part of each aerobic tank; And a treatment step of treating the treated water in the final treatment tank.

The bubble inflow step is to place the suction pipe end of the pump on the water surface of each oxic tank so as to collect bubbles and noxious gas on the water surface, and to discharge the collected foam and noxious gas around the oxygen pipe inside the oxic tank through the discharge pipe.

The bubble inflow step includes disposing the suction pipe end of the pump on the water surface of each oxic tank to collect bubbles and noxious gas on the water surface and discharging the collected foam and noxious gas around the oxygen pipe inside the aerobic tank through the discharge pipe, And discharging the bubbles and noxious gas to the lower part of the adjacent aerobic tank through the auxiliary discharge pipe.

The aerobic step or the treatment step further includes a foam circulation step of collecting bubbles in each aerobic tank or a final treatment tank and returning the collected bubbles to the flow regulation tank through the recovery channel and circulating the bubbles.

The recovered flow path is provided with a return pipe formed so as to be inclined downwardly toward the flow rate regulating tank so that the collected foam can be recovered to the flow rate regulating tank.

Another characteristic element of the wastewater treatment method of the present invention includes an inflow step of inflowing and storing inflow water such as wastewater into a flow rate control tank and a step of gradually introducing the inflow water into the plurality of aerobic bases having the respective acid engines, A bubble inflow step of sucking bubble and noxious gas on the water surface generated by air aeration in the breathing step by suction force of the pump and discharging it back to the lower part of each oxic tank; A gas dissolving step of sucking bubbles and noxious gas on the water surface generated by the air aeration by the suction force of the pump and discharging it to the bottom of the final treatment tank and dissolving it in the treated water and a process of fermenting through the foam inflow step and the gas dissolving step And a treatment step of treating the water in the final treatment tank.

The wastewater treatment apparatus, which is another characteristic element of the present invention, comprises a flow rate adjusting tank into which inflow water such as wastewater and the like is introduced and stored, and a flow rate adjusting tank which inflows the inflow water supplied from the flow rate adjusting tank gradually, And a final treatment tank for liquefying the treatment water fermented through the aerobic tank, wherein the bubbles and the noxious gas on the water surface generated by the aeration of the aerobic tank are sucked by the suction force of the pump, And a re-inflow means for re-entering the lower portion of the oxic tank.

And a recovery flow path for collecting bubble and noxious gas on the water surface generated by the air aeration in the aerobic tank in each aerobic tank or the final treatment tank, and returning the collected bubbles to the flow control tank for circulation.

Wherein the recovery flow path includes a recovery block provided at one side of the aerobic tank and the final treatment tank, a recovery pipe arranged in the form of a pipe inside the recovery block and provided so as to be inclined downwardly toward the flow control tank, And a foam passage hole formed so that the bubbles of the oxic tank or the final treatment tank are discharged to the return flow passage side when the treated water exceeds a certain level.

Wherein the re-inflow means comprises a pump disposed in the inside of the oxic tank or the final treatment tank, an inlet pipe disposed at an upper side of the pump and provided at a position close to the water surface so that the end portion collects bubbles and noxious gas on the surface of the oxi- And a discharge pipe for discharging the collected foam and noxious gas to the lower portion of the aerobic tank.

The inlet pipe connected to the pump disposed in the final treatment tank is provided at the upper part of the final treatment tank so as to be disposed on the water surface of the oxic tank, and has an inlet at an angle inclined to the water surface side of the oxic tank.

The re-inflow means further includes a cover for covering the upper portion of the flow control tank and the oxic tank and sealing the cover to the outside, and an acid inlet pipe having one end connected to the drain pipe and the other end passing through the lid to communicate with the outside of the lid.

The present invention differs from a compulsory purging method using an existing purging mechanism by sucking bubbles and noxious gas on the surface of the water generated in the air aeration process in the aerobic atmosphere of the wastewater into the bottom of the aerobic tank or the final treatment tank Bubbles and noxious gases are re-introduced into the aerobic tank or the final treatment tank to be dissolved in the water, thereby minimizing the odor generated in the air discharge of the noxious gas and the bubble puffing process.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flowchart sequentially showing a method for treating wastewater according to the present invention. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a waste water treatment method.
Figure 3 is a plan view of Figure 2;
Figure 4 is a side view of Figure 2;
5 is a front view showing the recovery flow path of the present invention.
6 is a configuration diagram showing another embodiment of the present invention.
7 is a flow chart showing another embodiment of the waste water treatment method of the present invention.
8 is a plan view showing a configuration of a wastewater treatment apparatus to which another embodiment of the wastewater treatment method of the present invention is applied.
Fig. 9 is a side view of Fig. 8; Fig.
10 is a front view of the pump disposed in the final treatment tank of the present invention.
11 is an enlarged view of the "C"

[First Embodiment]

1 to 5, the method for treating wastewater according to the present invention includes an inflow step S1 for inflow and storage of inflow water, which is wastewater, into and from a flow rate control tank 10, (S2) for blowing air into each of the oxic tank (A) while gradually transferring the air into the plurality of oxic tank (A) having the oxic tank A foam inflow step (S3) of sucking the noxious gas by the suction force of the pump (100) and discharging the noxious gas back to the lower part of each aerobic tank (A), and a step of supplying the treated water fermented through the foam inflow step And processing steps S4 for processing in the processing unit 20.

In the aerobic step S2, air is sufficiently aerated into the aerobic tank A, the air is sufficiently brought into contact with the sewage to supply oxygen, and the aerobic bacteria in the sludge are sufficiently decomposed to perform organic decomposition. Here, (A) by blowing air of small bubbles into the aerobic tank (A).

The exhalation step S2 preferably has 3 to 5 aerobic bases A for sufficient organic decomposition. Here, it is exemplified that four aerobic baskets (aerobic fermentation tanks A1, A2, A3, A4) .

The inflow step S1 is preferably carried out by feeding the influent water to the aerobic step S2 via the arbitrary fermentation tank 15 for storing the inflow water supplied from the flow rate control tank 10 into which the inflow water flows, .

Herein, the wastewater in the inflow step S1 is referred to as inflow water, and the wastewater in the exhalation step S2 and the processing step S4 is referred to as a treatment water.

The treatment step S4 includes a final treatment tank 20 for storing and storing the aerobic treatment treated water through each of the aerobic tank A and the final treatment tank 20 employs one or two liquid storage tanks can do.

The foam inflow step S3 is a step of placing the end of the suction pipe 110 of the pump 100 on the water surface of each aerobic tank A so as to collect foam and noxious gas on the water surface and collecting the collected foam and noxious gas in the discharge pipe 120 To the vicinity of the aerodrome 50 located at the lower portion of the aerobic tank A.

In the expiration step S2 or the processing step S4 of the present invention, the bubbles collected by collecting the bubbles in the respective aerobic tank A or the final treatment tank 20 are collected through the recovery flow passage 200, (10) and circulating the same through the bubble circulation step.

FIG. 6 is a view showing another embodiment of the present invention. In the bubble introducing step S3, unlike the above-described description, the end of the suction pipe 110 of the pump 100 is connected to each of the air- And the collected bubbles and noxious gas are discharged through the discharge pipe 120 to the vicinity of the aeration pipe 50 in the aerobic tank A and the collected bubbles and noxious gas are discharged to the auxiliary discharge pipe 130, To the lower portion of the adjacent aerobic tank (A).

To this end, the discharge pipe 120 of the pump 100 is disposed in the aerobic tank A, the auxiliary discharge pipe 130 is disposed on the lower side of the adjacent arcs of the next stage through the wall of the aerobic tank A, And the bubble and the noxious gas are discharged to the lower part of the two aerobic banks A by the pump 100.

Therefore, the number of the pumps 100 disposed in the plurality of oxic tank A can be reduced, and the bubble discharge efficiency can be improved.

2 to 5, the wastewater treatment apparatus to which the wastewater treatment method is applied includes a flow rate adjusting tank 10 through which inflow water such as wastewater is introduced and stored, A plurality of aerobic bases A having respective aerobic parts 50 for blowing air while gradually transferring the aerobic water to the aerobic part A to gradually decompose the organic matter, And a re-inflow means for sucking bubble and noxious gas on the water surface generated by the aeration of the air in the oxic tank (A) by the suction force of the pump (100), discharging it back to the lower portion of each oxic tank Respectively.

Referring to FIG. 2, the re-inflow means includes a pump 100, a suction pipe 110 disposed at an upper side of the pump 100 and provided at a position close to the water surface so as to collect bubbles and noxious gas on the water surface, And a discharge pipe 120 for discharging the collected foam and noxious gas to the lower portion of the aerobic tank A (especially around the aerodrome 50).

That is, the re-inflow means sucks foam and gas on the water surface through the suction pipe 110 when the pump 100 is driven, and then discharges it to the lower side in the aerobic tank A through the discharge pipe 120.

3 and 5, the recovery flow path 200 is for performing the above-described bubble circulation step and includes a recovery tank 210 provided at one side of the aerobic tank A and the final treatment tank 20, And a recovery pipe 220 disposed inside the recovery block 210 in the form of a pipe.

A foam passage hole 205 is formed in the recovery block 210 such that the foam pipe 205 is discharged toward the recovery flow path 200 when the bubbles of the oxic tank A and the final treatment tank 20 exceed a certain level .

The return pipe 220 is provided with a bent portion 225 which is bent to be connected to the flow control tank 10 side at an end thereof.

In addition, the recovery block 210 preferably has a lid 230 on the upper part of the recovery block 210 to minimize the generation of odor, and has a sealing structure.

More preferably, the recovery channel 200 is provided so that the recovery block 210 and the recovery pipe 220 are connected to one side of the final treatment tank 20 as well as the oxic tank A, And the recovery pipe 220 is inclined downwardly toward the flow rate control tank 10 so that the foam collected in the oxic tank A and the final treatment tank 20 is automatically recovered to the flow rate control tank 10 side.

Thus, the bubbles generated in the aerobic basin (A) and the final treatment tank 20 are re-introduced into the flow rate control tank 10 through the downwardly inclined recovery pipe 220 and circulated.

Therefore, the bubbles and noxious gas re-introduced into the oxic tank A are dissolved in the treated water in the oxic tank A and naturally treated, and the ammonia gas contained in the bubbles and causing odor is dissolved in the treated water So that it is possible to minimize the generation of bad odors in the atmosphere.

[Second Embodiment]

7 to 11 showing a second embodiment of the wastewater treatment method of the present invention, it comprises an inflow step S100 for introducing and storing inflow water such as wastewater into the flow rate control tank 10, (S200) for blowing air into the plurality of aerobic bases (A) having the aerodynamic compartment (50) by gradually blowing air into the aerobic tank (A) A foam inflow step (S300) of sucking the noxious gas by the suction force of the pump (100) and discharging the noxious gas back to the lower portion of each oxic tank (A), and a foam inflow step A gas dissolution step (S400) of sucking noxious gas by the suction force of the pump (100) and discharging it to the lower part of the final treatment tank (20) and dissolving it in the treated water; and a gas dissolution step (S400) ), And the treated water fermented through the And a processing step S500 for processing in the slaughterhouse 20.

This is because unlike the above-described embodiment, the noxious gas which causes the foam and the odor to remain in the upper part of the water surface of the oxic tank A is sucked by the suction force of the pump 100 and is supplied to the oxic tank A and the final treatment tank 20 So as to dissolve foam and noxious gas in the treated water.

As shown in FIGS. 8 and 9, unlike the previous embodiment of the wastewater treatment apparatus, the wastewater treatment apparatus to which this method is applied differs from the previous embodiment in that the pump 100 is provided not only in the oxic tank but also in the final treatment tank 20 And the pump 100 disposed in the final treatment tank 20 has the suction pipe 110 and the inlet pipe 310, respectively.

At this time, the suction pipe 110 is vertically connected to the pump 100 to suck foam and noxious gas on the water surface of the final treatment tank 20, and the inflow pipe 310 is connected to the upper surface of the final treatment tank 20 And suck bubbles and noxious gas on the water surface of the oxic tank A while being provided to extend in the lateral direction toward one of the oxic tank A.

In addition, the inflow pipe 310 has a structure having an inlet 115 at an inclined angle to the water surface side of the aerobic tank A at an end thereof.

The suction port 115 is provided at an end of the inflow pipe 310 connected from the final treatment tank 20 to the oxic tank A and is provided at a position close to the water surface for facilitating the collection of bubbles and noxious gas on the surface of the oxic tank A As shown in FIG.

The pump 100 disposed in the final treatment tank 20 has an exhaust pipe 120 disposed at the lower portion of the final treatment tank 20 as shown in Fig. 10, and the inlet pipe 310 and the inlet port 115, The bubbles and noxious gas collected in the aerobic tank A through the discharge pipe 120 disposed at the lower portion of the final treatment tank 20 are subjected to final treatment And discharges it to the lower part (the side of the air diffusing pipe 50) in the bath 20 to dissolve it in the treated water.

11, the wastewater treatment apparatus of the present invention may be provided with a lid 70 for covering the upper part of the final treatment tank 20 and shielding it from the outside, And has a function to block the harmful gas generated during the process of decomposing organic matter by aeration to the outflow of the harmful gas into the atmosphere.

It is preferable that the lid 70 is provided so as to cover the upper portion of the flow control tank 10 and the aerobic tank A as well.

In addition, the lid 70 is provided with a window-shaped observation port 75 so that the process of the inside can be confirmed from the outside.

When the oxic tank A and the final treatment tank 20 are sealed by the lid 70 as described above, the above-described diffusing pipe 50 is omitted, and as shown in Fig. 9, (150) connected at one end to the discharge pipe (120) of the main body (100) and connected at the other end to the outside of the lid (70).

Since the air diffuser pipe 150 is omitted from the air diffuser pipe 50 and connected to the outside of the cover 70 vertically through the discharge pipe 120 of the pump 100, The air in the outside of the cover 70 is sucked into the treatment water in the oxic tank A by the vacuum pressure generated in the inside of the oxic tank A,

In the second embodiment of the present invention, the recovery channel 200 has the same configuration as that of the first embodiment and the same reference numerals are applied thereto, and the recovery pipe 220 also has a structure inclined at an angle.

That is, according to the present invention, bubbles and noxious gas generated through the aeration of air are discharged to the lower side of the oxic tank (A) or the final treatment tank (20) and re-introduced into the oxic tank (A) And has a useful effect of minimizing odor.

10: Flow regulating tank 15: Randomness fermenter
20: Final treatment tank 50:
70: cover 75: observation hole
100: pump 110: suction pipe
115: inlet 120: outlet
130: auxiliary discharge pipe 150:
200: return flow passage 205: bubble passing hole
210: recovery block 220: recovery pipe
230: lid 310: inlet pipe
A: aerobic tank A1, A2, A3, A4: random fermenter

Claims (12)

An inflow step S1 for introducing and storing inflow water such as wastewater into the flow rate control tank 10,
An aerobic step (S2) of blowing air while gradually distilling the inflow water into a plurality of aerobic bases (A)
A foam inflow step (S3) of sucking bubble and noxious gas on the water surface generated by air aeration in the exhalation step (S2) by the suction force of the pump (100) and discharging it back to the lower part of each oxic tank (A)
And a treatment step (S4) of treating the treated water fermented through the foam inflow step (S3) in the final treatment tank (20). The method according to claim 1,
The bubble introducing step S3 is a step of placing the end of the suction pipe 110 of the pump 100 on the sleep surface of each aerobic tank A so as to collect bubbles and noxious gas on the water surface and collecting the collected bubbles and noxious gas in the discharge pipe 120 to the vicinity of the air diffusing pipe (50) in the oxic tank (A). The method according to claim 1,
The bubble introducing step S3 is a step of placing the end of the suction pipe 110 of the pump 100 on the sleep surface of each aerobic tank A so as to collect bubbles and noxious gas on the water surface and collecting the collected bubbles and noxious gas in the discharge pipe And discharging the collected bubbles and noxious gas to the lower part of the adjacent aerobic tank A through the auxiliary discharge pipe 130, Processing method. The method according to claim 1,
The aerobic step S2 or the treatment step S4 may be performed by collecting the bubbles in each of the aerobic tank A or the final treatment tank 20 and collecting the collected bubbles through the recovery flow path 200 toward the flow rate control tank 10 Further comprising a bubble circulation step of circulating the wastewater through the circulation pipe. The method of claim 4,
Wherein the recovery channel (200) is provided with a recovery pipe (220) formed to be inclined downwardly toward the flow rate control tank (10), so that the collected foam is recovered to the flow rate control tank (10) side. An inflow step S100 for introducing and storing inflow water such as wastewater into the flow rate control tank 10,
Aeration step (S200) of blowing air while gradually blowing the inflow water into the plurality of aerobic basins (A) in a stepwise manner to decompose organic matter;
A foam inflow step (S300) of sucking bubble and noxious gas on the water surface generated by air aeration in the exhalation step (S2) by the suction force of the pump (100) and discharging it back to the lower part of each oxic tank (A)
A gas dissolving step of sucking bubble and noxious gas on the water surface generated by the aeration of the air in the exhalation step S2 by the suction force of the pump 100 and discharging it again to the lower part of the final treatment tank 20 to dissolve it in the treated water S400)
And a treatment step (S500) of treating the treated water fermented through the foam inflow step (S3) and the gas dissolution step (S400) in the final treatment tank (20). A flow rate adjusting tank 10 through which inflow water such as wastewater is introduced and stored,
A plurality of aerobic tanks (A) for blowing air while gradually transferring inflow water supplied from the flow rate adjusting tank (10) step by step to decompose organic matter,
And a final treatment tank (20) for liquefying the treated water fermented in the oxic tank (A)
(A) or the bottom of the final treatment tank (20) by sucking the bubble and noxious gas on the water surface generated by the air aeration in the oxic tank (A) by the suction force of the pump (100) And an inflow means. The method of claim 7,
The bubbles on the water surface generated by the air aeration in the aerobic tank A are collected in the respective aerobic tank A or the final treatment tank 20 and the collected bubbles are flowed back to the flow rate control tank 10 side for circulation Further comprising a recovery flow path (200). The method of claim 8,
The recovery channel 200 includes a recovery block 210 provided at one side of the oxic tank A and the final treatment tank 20,
A recovery pipe 220 arranged in the form of a pipe inside the recovery block 210 and inclined downward toward the flow rate control tank 10,
The bubbles formed in the oxic tank A or the final treatment tank 20 are discharged to the side of the recovery flow path 200 when the treated water of the oxic tank A or the final treatment tank 20 exceeds a certain level, And a through hole (205). The method of claim 7,
The re-inflow means comprises a pump 100 disposed inside the oxic tank A or the final treatment tank 20 and a pump 100 disposed upstream of the pump 100 and having an end blown on the water surface of the oxic tank A and a noxious gas And a discharge pipe (120) for discharging the collected bubbles and noxious gas to the lower portion of the aerobic tank (A), characterized by comprising an inlet pipe (310) provided at a position close to the water surface . The method of claim 10,
An inflow pipe 310 connected to the pump 100 arranged in the final treatment tank 20 is connected to the aerobic tank A at the upper part of the final treatment tank 20 so that the end thereof is disposed on the surface of the aerobic tank A , And an inlet (115) inclined downward to the water surface side of the oxic tank (A) is provided at an end thereof. The method of claim 10,
The re-inflow means includes a cover 70 for covering the upper portion of the flow control tank 10 and the oxic tank A and sealing the outside of the flow control tank 10,
Further comprising an acid inlet pipe (150) having one end connected to the discharge pipe (120) and the other end passing through the lid (70) and communicating with the outside of the lid (70).

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