KR102310721B1 - Sewage treatment apparatus using electrolysis - Google Patents

Abstract

The present invention provides a sewage treatment apparatus using electrolysis that can effectively treat sewage. The sewage treatment apparatus includes a flow rate control tank for storing a certain amount of sewage flowing in from an outside; a contact oxidation tank having a hanging bio contactor (HBC) installed therein to biologically treat the sewage introduced through the flow rate control tank; a sedimentation tank in which the sludge in the sewage introduced through the contact oxidation tank is precipitated; an electrolysis tank having an electrolytic oxidation module in which a cathode and an anode are cross-arranged to remove ammonia in the sewage introduced through the sedimentation tank; a gas collection unit for collecting gas generated in the electrolysis tank; and a gas supply pipe for supplying the gas collected in the gas collection unit to the flow rate control tank.

Description

Sewage treatment device using electrolysis {SEWAGE TREATMENT APPARATUS USING ELECTROLYSIS}

The present invention relates to an apparatus for treating sewage using electrolysis, and more particularly, to a sewage treatment configured to improve sewage treatment efficiency and return sludge by supplying oxygen and hydrogen generated in the electrolysis process to a flow tank. It's about the device.

In general, if sewage and excreta generated from industrial sites or homes are buried in the soil as they are, they may penetrate into the soil and contaminate soil and groundwater and destroy the natural environment. The conventional sewage treatment apparatus consists of tanks divided by a plurality of diaphragms in one body, and includes a flow tank, a contact oxidation tank, a sedimentation tank, and the like.

Hereinafter, a sewage and wastewater treatment process by a conventional sewage treatment apparatus will be described with reference to the accompanying drawings.

1 is a schematic view of a conventional sewage treatment apparatus.

The flow rate of the wastewater introduced into the conventional wastewater treatment apparatus is adjusted in the flow tank 1 . One or more catalytic oxidation tanks are provided, and in the catalytic oxidation tanks 2, 3, 4, 5, an appropriate amount of oxygen is provided so that organic substances in the sewage and wastewater that have passed through the flow tank 1 can be decomposed by aerobic microorganisms. is in contact with In addition, in the sedimentation tank (6), the sediment containing the sewage and wastewater that has passed through the catalytic oxidation tanks (2, 3, 4, 5) is precipitated step by step.

The sedimentation tank 6 settles the sludge decomposed in the catalytic oxidation tanks 2, 3, 4, 5, and discharges only the supernatant water to the outlet, while the sludge goes through the sludge thickener (not shown) to the flow tank 1 on the upstream side. send. The sewage and wastewater discharged from the settling tank 6 is sent to the defoaming tank (not shown), the bubbles in the contact oxidation tanks (2, 3, 4, 5) are removed, and the sewage and wastewater passing through the defoaming tank (not shown) is discharged. It is collected in a tank, where it exits the sewage treatment system through an outlet pipe. ^{In addition, in a sewage treatment device with a daily treatment capacity of 50 m 3} or more, which has nitrogen and phosphorus items in the effluent water quality standards, an anaerobic tank may be installed before the aeration tank for the purpose of removing nitrogen and phosphorus (not shown).

However, the conventional sewage treatment apparatus configured as described above has a problem in that the water treatment efficiency is lowered due to the low water temperature phenomenon in winter. That is, when the temperature of the water is lowered, the biological treatment efficiency is reduced as the activity of microorganisms is lowered, and accordingly, BOD and COD are increased, so that normal water treatment cannot be performed.

In addition, a predetermined amount of sludge is returned from the settling tank 6 to the flow tank 1 in order to keep the amount of microorganisms inside the catalytic oxidation tank constant. Since an air pump is required, there is also a disadvantage in that the manufacturing cost of the sewage treatment device is greatly increased.

KR 10-0824809 B1

The present invention has been proposed to solve the above problems, and it is possible to effectively treat sewage even when the water temperature is low, and to provide a sewage treatment device capable of returning a part of the sludge in the settling tank to the flow tank without a separate air pump. There is a purpose.

According to the present invention for achieving the above object, there is provided a sewage treatment apparatus comprising: a flow rate adjustment tank for storing a predetermined amount of sewage introduced from the outside; a contact oxidation tank having a hanging bio contactor (HBC) installed therein to biologically treat the sewage flowing in through the flow control tank; a sedimentation tank in which the sludge in the sewage introduced through the catalytic oxidation tank is precipitated; an electrolysis tank having an electrolytic oxidation module in which a cathode and an anode are cross-arranged to remove ammonia in the sewage introduced through the settling tank; a gas collection unit for collecting the gas generated in the electrolysis tank; and a gas supply pipe for supplying the gas collected in the gas collection unit to the flow rate adjusting tank.

and a conveying pipe for conveying the sludge deposited in the settling tank to the flow rate adjusting tank, wherein the gas supply pipe has an outlet end connected to the conveying pipe to deliver the gas collected in the gas collection unit to the conveying pipe .

The conveying pipe includes a horizontal part having one longitudinal end communicating with the lower side of the settling tank and the other longitudinal end communicating with the lower side of the flow rate adjusting tank, and a vertical part extending upward from the other longitudinal end of the horizontal part, the gas The outlet end of the supply pipe is connected to the vertical part.

It further includes a pressure sensor for sensing the internal pressure of the gas collection unit, and an opening/closing valve for opening the internal flow path of the gas supply pipe when the internal pressure of the gas collection unit exceeds a preset reference value.

It is mounted on the gas supply pipe, and further includes a gas compression unit for supplying the gas to the gas supply pipe by compressing the gas collected in the gas collection unit to a high pressure.

The gas supply pipe further includes a gas storage tank installed at the rear end of the point where the gas compression unit is mounted, storing the air compressed by the gas compression unit, and discharging the compressed air when an exhaust signal is applied.

An external chamber installed outside the electrolysis tank and in which the electrolytic oxidation module is built, a suction pipe for supplying sewage water in the electrolysis tank to the external chamber, and supplying the sewage water and gas inside the external chamber to the gas collection unit It further includes a discharge pipe that does.

By using the sewage treatment apparatus according to the present invention, the sewage that has passed through the catalytic oxidation tank can be electrolytically oxidized to effectively treat the sewage even when the water temperature is low, and hydrogen and oxygen generated in the electrolytic oxidation process are supplied to the flow rate control tank for purification. It has the advantage of improving efficiency and improving the reproduction rate of microorganisms, and that the sludge in the settling tank can be returned to the flow tank without a separate air pump.

1 is a schematic view of a conventional sewage treatment apparatus.
2 is a schematic view of a sewage treatment apparatus according to the present invention.
3 is a schematic diagram of a second embodiment of a sewage treatment apparatus according to the present invention.
4 is a schematic diagram of a third embodiment of a sewage treatment apparatus according to the present invention.
5 is a schematic diagram of a fourth embodiment of a sewage treatment apparatus according to the present invention.
6 is a schematic view of a fifth embodiment of a sewage treatment apparatus according to the present invention.

Hereinafter, an embodiment of a sewage treatment apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view of a sewage treatment apparatus according to the present invention.

The sewage treatment apparatus according to the present invention is a water treatment apparatus for purifying sewage by a biological treatment method using microorganisms, and includes an electrolysis tank to treat ammonia contained in the sewage by an electrolytic oxidation method, The first feature is that it is configured to increase the efficiency of wastewater treatment by supplying gases such as hydrogen and oxygen to the flow control tank.

That is, as shown in FIG. 2, the sewage treatment apparatus according to the present invention includes a flow control tank 100 for storing a certain amount of sewage introduced from the outside, and a hanging microorganism contact material 210 (HBC: Hanging Bio Contactor) inside. The catalytic oxidation tank 200 is installed in the catalytic oxidation tank 200 to biologically treat the sewage flowing in through the flow control tank 100, and the sedimentation tank 300 in which the sludge (S) in the sewage introduced through the catalytic oxidation tank 200 is precipitated. ) and an electrolysis tank 400 in which an electrolytic oxidation module 410 in which a cathode and an anode are cross-arranged is mounted to remove ammonia in the sewage introduced through the settling tank 300, and the electrolysis tank 400 ) is configured to include a gas collection unit 500 for collecting the gas, and a gas supply pipe 600 for supplying the gas collected in the gas collection unit 500 to the flow rate adjustment tank 100 .

The electrolytic oxidation module 410 has a structure in which a cathode and an anode are cross-arranged, the anode may be manufactured by mixing carbon nanotubes and epoxy, and the anode may be manufactured in a structure in which titanium metal is coated with iridium oxide. have. As described above, the electrolytic oxidation module 410 having a structure in which the cathode and the anode are cross-arranged to cause an electrolytic oxidation action has been proposed in various structures in the water treatment field. Detailed description will be omitted. In addition, since the flow rate adjustment tank 100, the catalytic oxidation tank 200, and the sedimentation tank 300 are also substantially the same as those applied to the conventional sewage treatment apparatus, the flow rate adjustment tank 100, the contact oxidation tank 200, and the sedimentation tank ( 300) will also be omitted.

The electrolysis tank 400 is configured to enable total nitrogen treatment regardless of water temperature through an electrolytic nitrogen oxide removal mechanism. That is, the removal of ammonia nitrogen in sewage by electrolysis is achieved through the simultaneous effects of direct anodization and indirect anodization, similar to organic material oxidation.

Direct oxidation of ammonia nitrogen by electrolysis is as follows [Formula 1].

[Formula 1]

NH ₃ + 3OH ^- → 0.5N ₂ + 3H ₂ O + 3e ^-

That is, ammonia removal occurs at the anode and is oxidized to nitrogen gas while generating trivalent electrons at a faradic efficiency of nearly 100%. Nitrous acid and nitric acid are produced as intermediate products of ammonia oxidation as shown in the following [Formula 2] and [Formula 3] according to the water concentration of OH ^-.

[Formula 2]

NH ₃ + 7OH ^- → NO ₂ ^- + 5H ₂ O + 6e ^-

[Formula 3]

NH ₃ + 9OH ^- → NO ₃ ^- + 6H ₂ O + 8e ^-

In addition, chlorine liberated by the indirect reaction reacts with ammonia nitrogen to generate nitrogen gas as a final product as shown in the following [Formula 4].

[Formula 4]

2NH ₄ ⁺ + 3HOCl ^- → N ₂ + 3H ₂ O + 5H ⁺ + 3Cl ^-

In addition, in the electrolysis tank 400, it is possible to remove residual organic materials in the effluent due to the 'organic material removal mechanism' of electrolytic oxidation. That is, as shown in the following [Formula 5] and [Formula 6], in the electrolysis of an organic material, metal ions in an acidic solution are oxidized from a stable state to an excited state during the electrolysis process, and a reactant as an intermediate product is generated.

[Formula 5]

xMN ⁺ → xM(N ⁺¹ ) + xe ^-

[Formula 6]

xM(N ⁺¹ ) + reacting agent → xMN ⁺ + yCO ₂

In addition, although electrolysis of organic materials is oxidized at the anode, direct oxidation in which hydroxide ions are adsorbed on the electrode surface by electrolysis of water to oxidize organic materials, and indirect by intermediate products such as hypochlorous acid generated by electrolysis of chlorine oxidation can be distinguished.

For organic material removal by direct oxidation, hydroxide ions generated by electrolysis of water on the electrode surface (M[ ]) are adsorbed to the anode as shown in [Formula 7] below.

[Formula 7]

H ₂ O + M[ ] → M[OH ^- ] + H ⁺ + e ^- (18)

The organic material is oxidized by the hydroxide ions absorbed and incorporated on the electrode surface, and this reaction is as shown in [Formula 8] and proceeds well in an acidic solution of high current density as follows.

[Formula 8]

R + M[OH ^- ] → M[ ] + RO + H ⁺ + e ^-

Here, RO is an organic material oxidized by continuously formed hydroxide ions and continues the anode discharge in water. The organic matter removal mechanism of electrolysis is as follows. First, as shown in the following [Formula 9] and [Formula 10], the anode (MOX+1) that is further oxidized by adsorption of hydroxide ions generated by the electrolysis of water to the oxidized anode (MOX) and reacting with the already generated oxygen (MOX+1) to form

[Formula 9]

MOX + H ₂ O → MOX[OH ^- ] + H ⁺ + e ^-

[Formula 10]

MOX [OH ^- ] → MOX ⁺¹ + H ⁺ + e ^-

In addition, the organic material (R) reacts with the hydroxide ions adsorbed on the oxidizing anode and is decomposed into carbon dioxide, water, or hydrogen ions as shown in the following [Formula 11].

[Formula 11]

R + MOX [OH ^- ]z → CO ₂ + zH ⁺ + ze ^- + MOX

In the electrochemical reaction of the organic material removed by indirect oxidation, anodic oxidation of chlorine occurs simultaneously during electrolysis as shown in [Formula 12] below, and hypochlorous acid is formed on the electrode surface.

[Formula 12]

H ₂ O + M[ ] + Cl ^- → M[HOCl] + H ⁺ + 2e ^-

At this time, the reaction in which the organic material is oxidized by hypochlorous acid generated at the anode is shown in [Formula 13].

[Formula 13]

R + M [HOCl] → M[ ] + RO + H ⁺ + Cl ^- + 2e ^-

In the electrolytic oxidation reaction process as described above, gases such as hydrogen and oxygen are generated. The sewage treatment apparatus according to the present invention does not discharge hydrogen and oxygen generated from the electrolytic oxidation module 410 into the atmosphere, but is shown in FIG. 1 . As described above, there is a first feature in the configuration in that after collecting by using the gas collection unit 500 , it is supplied to the flow rate adjusting tank 100 through the gas supply pipe 600 .

Since the gas collected in the gas collection unit 500 (hereinafter abbreviated as 'collection gas') has an oxygen concentration higher than the oxygen concentration in the atmosphere, the collection gas is supplied to the flow rate control tank 100 as shown in FIG. 1 . When this is done, it is possible to obtain the effect that the sewage in the flow rate control tank 100 is purified by oxygen. In addition, when the collection gas having a high oxygen concentration is supplied into the flow control tank 100 , the oxygen transfer efficiency to the catalytic oxidation tank 200 can be increased, so that the microorganisms attached to the suspended microorganism contact material 210 can be more activated. there is also

In this embodiment, only the case where the gas supply pipe 600 supplies the collected gas to the flow rate adjusting tank 100 is illustrated, but the gas supply pipe 600 supplies the collected gas to the contact oxidation tank 200 or the flow rate adjusting tank It may be configured to supply both 100 and the catalytic oxidation tank 200 .

3 is a schematic diagram of a second embodiment of a sewage treatment apparatus according to the present invention.

In general, in the sewage treatment apparatus, a conveying pipe 700 connecting the settling tank 300 and the flow rate adjusting tank 100 is installed so that a part of the sludge (S) deposited in the settling tank 300 can be returned to the flow rate adjusting tank 100 . , an air pump (not shown) for injecting a large amount of air bubbles into the conveying pipe 700 so that a part of the sludge (S) in the settling tank 300 can flow through the conveying pipe 700 is provided.

At this time, the sewage treatment apparatus according to the present invention is another structural feature in that it is configured to supply a portion of the sludge (S) in the settling tank 300 to the flow rate adjustment tank 100 through the return pipe 700 without a separate air pump. There is this. As shown in FIG. 3, the sewage treatment apparatus according to the present invention is provided with a conveying pipe 700 for conveying the sludge (S) deposited in the settling tank 300 to the flow rate adjusting tank 100, and the gas supply pipe 600 ) may be installed such that the outlet end is connected to the conveyance pipe 700 to deliver the gas collected in the gas collection unit 500 to the conveyance pipe 700 .
At this time, the sewage treatment apparatus according to the present invention includes a pressure sensor (not shown) that detects the internal pressure of the gas collection unit 500 so as to increase the flow rate of the collection gas supplied to the conveying pipe 700, and the An opening/closing valve 610 for opening the internal flow path of the gas supply pipe 600 when the internal pressure of the gas collection unit 500 exceeds a preset reference value may be additionally provided.
In this way, when the pressure sensor and the on/off valve 610 are additionally provided, the collected gas collected in the gas collecting unit 500 when the gas is collected in the roll gas collecting unit 500 in a state in which the on/off valve 610 is closed. As time passes, the pressure gradually increases. When the on/off valve 610 is opened when the pressure of the gas collected in the gas collection unit 500 is higher than the preset reference value, the collected gas compressed with high pressure flows into the conveying pipe 700 and rises quickly. .

As described above, when the collection gas is configured to be rapidly supplied to the conveying pipe 700 , the collection gas supplied to the conveying pipe 700 changes into a large amount of bubbles and rises along the conveying pipe 700 , an air lift is performed. As an effect occurs, the sludge (S) accumulated on the bottom of the settling tank 300 is sucked into the conveying pipe 700 and then supplied to the flow rate adjusting tank 100 together with the collected gas bubbles.

That is, since the sewage treatment apparatus according to the present invention can supply a large amount of collected gas to the inside of the conveying pipe 700 without installing a separate air pump, various pumps and pipes for sludge (S) circulation can be omitted. Accordingly, there is an advantage that not only the internal configuration is simplified, but also the maintenance cost and the manufacturing cost of the waste water purification device required for purifying the sewage are significantly reduced.

On the other hand, the faster the collection gas supplied to the conveying pipe 700 flows, the higher the conveying effect of the sludge (S). It is preferable to be connected. That is, as shown in FIG. 3 , when the conveying pipe 700 is composed of a horizontal part 710 and a vertical part 720 , the gas supply pipe 600 has an outlet end connected to the vertical part 720 . can At this time, the horizontal part 710 has one longitudinal end (the right end in this embodiment) communicated with the lower side of the settling tank 300 and the other longitudinal end (the left end in this embodiment) is the lower side of the flow control tank 100 . It extends in the horizontal direction to communicate with, and the vertical portion 720 is configured to extend upward from the other longitudinal end (the left end in this embodiment) of the horizontal portion (710).

As such, when the outlet end of the gas supply pipe 600 is connected to the middle of the vertical part 720 , the collected gas supplied through the gas supply pipe 600 quickly floats upward as soon as it is supplied to the conveying pipe 700 , so separately There is an advantage that a part of the sludge (S) stored in the settling tank 300 can be smoothly returned to the flow rate adjustment tank 100 without an air pump of the.

At this time, in this embodiment, only the case where the connection portion of the horizontal portion 710 and the vertical portion 720 is bent at a right angle, but in order to improve the fluidity of the sludge S flowing along the conveying pipe 700, The horizontal portion 710 and the vertical portion 720 may be replaced with curved connecting portions. That is, the shape and mounting position of the transport pipe 700 may be variously changed according to the designer's selection.

In addition, as described above, if the collected gas is configured to be supplied to the return pipe 700 only while the pressure of the collected gas of the gas collection unit 500 exceeds the reference value, that is, the sludge S in the settling tank 300 is constant. If it is configured to be returned intermittently at an interval of time, it is possible to sufficiently secure a time for the sludge (S) to settle in the settling tank 300, and accordingly, there is also an advantage that the concentration of the returned sludge (S) can be increased.

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At this time, the opening and closing of the opening/closing valve 610 may be configured to be operated by an operation signal input by an operator, and automatically open for a predetermined time when the pressure of the collected gas sensed by the pressure sensor rises above a predetermined level. may be configured.

4 is a schematic diagram of a third embodiment of a sewage treatment apparatus according to the present invention, and FIG. 5 is a schematic diagram of a fourth embodiment of a sewage treatment apparatus according to the present invention.

If the on-off valve 610 is closed while the gas generated from the electrolytic oxidation module 410 is collected in the gas collection unit 500, the pressure of the collected gas inside the gas collection unit 500 may increase to a certain level, but an air pump may be used. There is a disadvantage in that it is not possible to supply high-pressure air bubbles to the conveying pipe 700 as in other cases.

As shown in FIG. 4 , the wastewater treatment apparatus according to the present invention compresses the gas collected in the gas collection unit 500 to a high pressure and supplies the gas to the gas supply pipe 600 to solve this problem. The unit 800 may be mounted on the gas supply pipe 600 . The gas compression unit 800 is a device for compressing the gas collected in the gas collection unit 500 to a high pressure higher than a reference value, and may be applied to various types of gas pumps and the like.

When the gas compression unit 800 is additionally provided as described above, since the gas collected in the gas collection unit 500 is compressed to a high pressure higher than the reference value and supplied to the conveying pipe 700, the vertical part of the conveying pipe 700 ( 720) has the advantage that the high-pressure collected gas is aerated to further increase the efficiency of conveying the sludge (S) through the conveying pipe 700 .

In addition, the sewage treatment apparatus according to the present invention may be configured to supply to the conveying pipe 700 immediately after the gas compression unit 800 compresses the collected gas, and the collected gas compressed by the gas compression unit 800 is The stored sludge (S) may be configured to be supplied to the return pipe 700 at a time when it is needed.

That is, as shown in FIG. 5 , the sewage treatment apparatus according to the present invention is mounted at the rear end of a point where the gas compression unit 800 is mounted in the gas supply pipe 600 and is formed by the gas compression unit 800 . It may further include a gas storage tank 900 that stores the compressed air and discharges the compressed air when an exhaust signal is applied.

As such, when the gas storage tank 900 is additionally provided, a large amount of the high-pressure collected gas can be stored, so when the sludge (S) transport is required, the high-pressure collected gas can be supplied to the transport pipe 700 over a long period of time. , it has the advantage of being able to freely control the amount of sludge (S) transported and the transport cycle. At this time, the gas storage tank 900 may be manufactured in various capacities according to various conditions such as the standard of the electrolytic oxidation module 410 and the type of the sludge S to be returned.

6 is a schematic view of a fifth embodiment of a sewage treatment apparatus according to the present invention.

In the sewage treatment apparatus according to the present invention, an electrolytic oxidation module 410 for treating the sewage supplied to the electrolysis tank 400 in an electrolytic oxidation method may be installed in the electrolysis tank 400, and FIG. As shown in the electrolysis tank 400 may be installed outside.

In this way, in order for the electrolytic oxidation module 410 to be installed outside the electrolysis tank 400, it is installed outside the electrolysis tank 400 and includes an external chamber 420 in which the electrolytic oxidation module 410 is built. , a suction pipe 440 for supplying the sewage from the electrolysis tank 400 to the external chamber 420, and a discharge pipe for supplying the sewage and gas inside the external chamber 420 to the gas collection unit 500 ( 450). The suction pipe 440 is equipped with a pump 430 for sucking the sewage, the sewage inside the electrolysis tank 400 is supplied to the external chamber 420 through the suction pipe 440 to the electrolytic oxidation module 410 ) and then transferred to the gas collection unit 500 through the discharge pipe 450 .

At this time, the wastewater delivered to the gas collection unit 500 through the discharge pipe 450 contains gases such as hydrogen and oxygen generated by the electrolytic oxidation module 410 , and the wastewater is filled in the electrolysis tank 400 . And the gas is collected in the gas collection unit (500). A subsequent process in which the gas collected in the gas collection unit 500 is supplied to the flow control tank 100 side through the gas supply pipe 600 is substantially the same as the embodiment shown in FIG. 5 , so a detailed description thereof will be omitted.

As mentioned above, when the electrolytic oxidation module 410 is installed outside the electrolysis tank 400, even if the inside of the electrolysis tank 400 is not emptied, the electrolytic oxidation module 410 can be replaced or repaired, so maintenance is reduced. It has the advantage of being easy. In addition, when the electrolytic oxidation module 410 is installed outside the electrolysis tank 400, the electrolytic oxidation module 410 is in contact with the sewage only while processing the sewage, and while not treating the sewage, the external chamber 420 By leaving the , the electrolytic oxidation module 410 can not come into contact with waste water, so that the lifespan extension effect of the electrolytic oxidation module 410 can be obtained.

As mentioned above, although the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to specific embodiments, and should be interpreted by the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

100: flow control tank 200: contact oxidation tank
210: suspended microorganism contact material 300: sedimentation tank
400: electrolysis tank 410: electrolytic oxidation module
420: outer chamber 430: suction pump
440: suction pipe 450: discharge pipe
500: gas collection unit
600: gas supply pipe 610: on/off valve
700: conveying pipe 710: horizontal part
720: vertical part 800: gas compression unit
900: gas storage tank S: sludge

Claims (7)

a flow rate control tank that stores a certain amount of sewage flowing in from the outside;
a contact oxidation tank having a hanging bio contactor (HBC) installed therein to biologically treat the sewage introduced through the flow control tank;
a sedimentation tank in which the sludge in the sewage introduced through the catalytic oxidation tank is precipitated;
an electrolysis tank having an electrolytic oxidation module in which a cathode and an anode are cross-arranged to remove ammonia in the sewage introduced through the settling tank;
a gas collection unit for collecting the gas generated in the electrolysis tank;
a gas supply pipe for supplying the gas collected in the gas collection unit to the flow rate adjusting tank;
a pressure sensor for sensing the internal pressure of the gas collection unit;
an opening/closing valve for opening the internal flow path of the gas supply pipe when the internal pressure of the gas collection unit exceeds a preset reference value;
a return pipe for returning the sludge deposited in the settling tank to the flow control tank;
including,
The gas supply pipe has an outlet end connected to the transport pipe, and the gas collected in the gas collection unit is transferred to the transport pipe. delete The method according to claim 1,
The conveying pipe is composed of a horizontal part having one longitudinal end communicating with the lower side of the settling tank and the other longitudinal end communicating with the lower side of the flow control tank, and a vertical part extending upward from the other longitudinal end of the horizontal part,
The gas supply pipe has an outlet end connected to the vertical part. delete The method according to claim 1,
and a gas compression unit mounted on the gas supply pipe to compress the gas collected in the gas collection unit to a high pressure and supply it to the gas supply pipe. 6. The method of claim 5,
and a gas storage tank installed at the rear end of the point at which the gas compression unit is mounted in the gas supply pipe, storing the air compressed by the gas compression unit, and discharging the compressed air when an exhaust signal is applied. a sewage treatment system. The method according to claim 1,
An external chamber installed outside the electrolysis tank and in which the electrolytic oxidation module is built, a suction pipe for supplying sewage water in the electrolysis tank to the external chamber, and supplying the sewage water and gas inside the external chamber to the gas collection unit Sewage treatment apparatus, characterized in that it further comprises a discharge pipe.

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