JP3336410B2 - Apparatus and method for treating sewage and wastewater by biological reaction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a biological treatment and method for sewage and wastewater, and more particularly to an aeration tank for oxidizing organic substances by microorganisms, an oxygen-free and anaerobic tank for removing nitrogen and phosphorus, The present invention also relates to an apparatus and method for treating sewage and wastewater by a biological reaction in which the function of a precipitation tank for precipitating microorganisms is performed by a double cylindrical treatment tank.

[0002]

2. Description of the Related Art In general, a biological treatment apparatus for sewage and wastewater widely used at present has an aeration tank as an organic matter oxidizing tank and a sedimentation tank for precipitating microorganisms grown in the aeration tank. Is oxidized and removed. In addition,
In addition to the removal of organic substances, in the apparatus for removing nitrogen and phosphorus, a denitrification tank and an anaerobic tank are installed in a lateral flow type separately from the aeration tank to remove nitrogen and phosphorus contained in wastewater. However, since such a conventional biological treatment apparatus is installed in a cross flow type, a large site area is required, and since the structures of the aeration tank and the sedimentation tank are constructed with cement, construction costs are reduced. There was a problem that becomes high.

[0003] As a method of supplying air to the aeration tank, a ceramic, cloth, or the like is conventionally provided at the bottom of the aeration tank.
Attached to the perforated plate of resin and resin, and a diffuser tube that generates air bubbles by pipes, and oxygen is supplied so that relatively large air bubbles are generated, but the concentration of microorganisms was increased in the aeration tank. In such a case, in such a conventional oxygen supply method, the oxygen consumption rate of microorganisms is faster than the air supply rate,
The phenomenon of lack of dissolved oxygen appears. Therefore, when treating high-concentration organic wastewater, the concentration of microorganisms should be reduced to 40% due to the limitation of the oxygen supply rate.
There was a problem that it could not be made higher than 00 mg / l.

Since the secondary sedimentation tank is provided separately from the aeration tank, another transport pump is required to transfer the settled sludge to the aeration tank. In addition, a scraper is provided to prevent the settled sludge from being clogged in the conveying sludge pipe, and the mechanical and electric devices related to such a scraper and the conveying pump have a very complicated structure.

Further, the conventional activated sludge method is intended only for removing organic substances, so that only an aeration tank, which is an organic substance oxidizing tank, is provided. In the (A ² / O: anaerobic-anoxic-aerobic) method and the Bardenpho (Bardenpho: anaerobic-anoxic-aerobic-anoxic-aerobic) method, in addition to the aeration tank, anoxic for removing nitrogen Denitrification tank
tank) and an anaerobic tank for phosphorus release (Anaerobic tank)
Is further provided. At this time, in the above-mentioned denitrification tank, in order to remove nitrate nitrogen and nitrite nitrogen generated from the aeration tank, a speed that is 2 to 6 times the inflow flow rate for transporting the aeration tank sludge liquid to the denitrification tank is required. An internal circulation pump must be provided, and each reactor such as an anaerobic tank and a denitrification tank must be provided with a stirrer for uniform mixing of the sludge mixture. Therefore, when the phosphorus and nitrogen removing step is additionally performed in addition to the organic substance removing step, the process configuration and the mechanical facilities are more complicated than those of the conventional activated sludge method.

[0006] As described above, the conventional biological treatment apparatus is provided in a lateral flow type, and in addition to an aeration tank, a denitrification tank which is anoxic for nitrogen removal and an anaerobic tank for releasing phosphorus, and Since the sedimentation tanks and the like are separated from each other, not only a large site area is required, but also a stirrer, a transport pump, a scraper, etc. are provided in each reaction tank, and sludge transfer to each process is performed by a pump. Therefore, there is a problem that the mechanical device is complicated and the installation cost is high.

[0007] Also, in the treatment of organic matter, according to the conventional air supply method, when treating high-concentration organic wastewater,
Since the rate of oxygen consumption of microorganisms is higher than the rate of air supply, there is a limitation on the rate of oxygen supply, which involves a problem that it is extremely difficult to maintain a high concentration of microorganisms.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and a microfiltration membrane (microfiltrat) is used as an air supply method instead of a conventional air diffuser.
ion, pore size 0.1 ~ 100μm) and ultrafiltration membrane (ultraf
iltration, 1.5-10μm pore size) using a membrane (Membrane) to generate dissolved oxygen or ultra-fine bubbles, to increase the efficiency of contact between microorganisms and air, By increasing the oxygen supply rate,
An object of the present invention is to provide an apparatus and a method for treating sewage and wastewater by a biological reaction in which the concentration of microorganisms is maintained at 10,000 mg / l or more and the capacity of a reaction tank is greatly reduced.

Further, the present invention provides a double biological reaction tank in a circular or square cylinder, wherein aerobic conditions are formed in a compartment to which air is supplied, and oxygen-free is provided in a compartment to which no air is supplied. Another object of the present invention is to provide an apparatus and method for treating sewage and wastewater by a biological reaction which forms an environment for removing phosphorus and nitrogen as well as removing organic substances in one reaction tank by forming anaerobic conditions. And

[0010] The present invention also provides a biological reaction tank having a vertical double partition so that the air supplied to the aeration tank is released to release phosphorus and remove nitrogen in the anaerobic tank. Provided is an apparatus and method for treating sewage and wastewater by a biological reaction in which a sludge mixture in an aeration tank can be transferred to an oxygen-free and anaerobic tank by force, thereby simplifying a treatment facility compared to a conventional phosphorus and nitrogen reaction facility. For another purpose.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an aeration tank in which an air component is brought into contact with a mixture of activated sludge, and an inside of the aeration tank. A bubble providing means for forming bubbles while having a predetermined driving force to transfer the inflowing water flowing into the aeration tank sludge mixture while making contact therewith, and covering the outside of the aeration tank, Contains the influent and the aeration tank sludge mixture that has overflowed to the outside, removes nitrogen by biological reaction,
An anaerobic and anaerobic tank that simultaneously releases phosphorus, and a sediment that covers the outside of the anaerobic and anaerobic tank and contains sludge that is discharged and settled while circulating between the aeration tank and the anaerobic and anaerobic tank. a vessel seen including, the lower part of the anoxic and anaerobic tank
Extends below the aeration tank, and the air bubble providing means
Is located at the lower part of the aeration tank and has
And the sludge discharged from the anoxic and anaerobic tanks
The sludge in the settling tank and the sludge in the settling tank
Provided is an apparatus for treating sewage and wastewater by a biological reaction, wherein the apparatus is configured to flow from the wastewater.

The present invention also provides a first stage in which inflow water including sewage and wastewater from which contaminants have been removed by a screen flows into an aeration tank, and squirts upward through an aeration tube attached to a lower part of the aeration tank. The air component is brought into contact with the influent water to form microbubbles, and at the same time an upward driving force is generated.
A second step of causing the inflow water and aeration tank sludge flowing into the aeration tank to be transported to the outside of the aeration tank by the transport driving force.
A third stage of overflowing and transporting to an oxygen-free and anaerobic tank that covers the above, a fourth stage of removing nitrogen from the influent and sludge mixture flowing into the oxygen-free and anaerobic tank and releasing phosphorus, The sludge and sedimentation tank sludge discharged from the anaerobic tank are re-introduced into the aeration tank from the lower part by the above-mentioned transporting propulsion , and the organic matter and nitrogen components that have not been removed are oxidized to remove phosphorus.
A fifth stage of ingesting, after performing the fifth stage, a sixth stage in which the sludge generated in the aeration tank and the inflowing water flowing from the outside are mixed and recirculated ;
Microorganisms separate solid and liquid in a sedimentation tank that covers the outside , sludge is sedimented, and treated water is discharged through overflow clothing.
The present invention provides a method for treating sewage and wastewater by a biological reaction including the steps of:

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIG.

As shown in FIG. 1, the apparatus and method for treating sewage and wastewater by biological reaction according to the present invention include an inflow water 1 containing sewage and wastewater from which impurities are removed by a screen (not shown). And an aeration tank 2 forming an internal space for allowing an air component to come into contact with a mixed liquid of activated sludge. At the lower part of the aeration tank 2, there is provided a diffuser pipe 5 which blows out air to form fine bubbles so as to bring the air component into contact with the inflow water flowing into the upper part and the sludge mixture. 5 is provided with a blower 11 or a compressor for providing external air. At this time, the inflow water and the sludge mixture are caused to flow out of the aeration tank 2 by the propulsive force of the air ejected through the air diffuser 5.

In a preferred embodiment of the present invention, the aeration tank 2
If manure or livestock wastewater flows into the wastewater, it is necessary to maintain the concentration of microorganisms at a high concentration. In this case, a membrane such as a microfiltration membrane or an ultrafiltration membrane is used instead of the air diffusion tube 5, In addition, even if a membrane is used in place of the air diffuser 5, sludge conveyance driving force is insufficient,
The structure is such that a submersible agitating pump 8 is mounted on the upper inside of the aeration tank 2 and provides a propulsive force necessary for mixing and transporting sludge.

Outside the aeration tank 2, inflow water formed to be larger than the diameter by a predetermined diameter and flowing out of the aeration tank by the driving force of the air ejected from the air diffusion tube 5,
An anoxic and anaerobic tank 3 is provided to remove the nitrogen by performing a biological reaction on the mixed liquid of the aeration tank sludge having a high concentration of nitrate nitrogen and nitrite nitrogen and to simultaneously release phosphorus. On the inner surface of the oxygen-free and anaerobic tank 3, a large number of mixing guide plates 7 are provided in a zigzag manner to smoothly mix the sludge mixed solution overflowed in the aeration tank 2 with the inflow sewage and wastewater. Can be

As described above, the aeration tank 2 and the anaerobic and anaerobic tank 3 are composed of upright double tubes, and have a structure in which the upper and lower parts are opened. The first support 9 supports the space so as to maintain the interval.
In the present embodiment, the structure in which the double pipe is formed in a cylindrical shape is shown, but the present invention is not limited to this, and may be formed in a polygonal box such as an ellipse, a square, and a hexagon. good. Outside the anoxic and anaerobic tank 3, there is provided a sedimentation tank 4 for precipitating and storing sludge circulating between the anoxic and anaerobic tank 2. 3 is provided with a second support 14 for supporting the position of the support 3 while maintaining a constant interval.

In this embodiment, as shown in FIG. 1, the lower sections of the aeration tank 2, the oxygen-free and anaerobic tank 3, and the sedimentation tank 4 have horizontal sections and circular arcs provided on both sides of the horizontal sections. And the tangent line at the boundary between the horizontal part and the arc part has a structure in which the tangent is inclined at an angle of 1/10 to 1/20 inward with respect to the horizontal part. The sludge and the settling tank sludge flowing out of the tank 3 smoothly flow into the aeration tank 2 by a propulsive force generated by air supply.

In the middle part of the settling tank 4, a specific surface area (specific surface area) of the settling tank sludge is increased by nitrogen gas or air balls.
A sludge floating prevention net 13 is provided to prevent the surface area from becoming large and floating, and the outer peripheral surface of the upper part of the sedimentation tank 4 accommodates the treated water overflowed therethrough and discharges it to the outside. Overflow Wear (weir) 6
The sedimentation tank 4 is provided with an openable / closable lid 15 at the upper part of the sedimentation tank 4 to prevent rainwater or the like from flowing.

The operation of the present invention configured as described above will be described as follows.

First, when the inflow water 1 from which contaminants have been removed by the screen flows into the upper part of the aeration tank 2, the inflow water 1 is transferred to the upper part by the driving force of the air discharged from the diffusion pipe 5. Along with the sludge, it is evenly dispersed and flows into the anoxic and anaerobic tank 3. As a result, the inflow water 1
Before being oxidized under aerobic conditions, it is used as a carbon source required for nitrogen removal and phosphorus release in anoxic and anaerobic tanks 3.

Between the upper part and the middle part of the anaerobic and anaerobic tank 3, the influent water and the mixed liquid of the aeration tank sludge are completely mixed while hitting the mixing guide plate 7 in the form of zigzag. Is depleted in oxygen, and a reaction occurs in which nitrate nitrogen and nitrite nitrogen contained in the aeration tank sludge mixture are reduced to nitrogen gas and removed using the organic matter of the inflow water as a carbon source. And in the middle part and lower part of the anoxic and anaerobic tank 3, dissolved oxygen, nitrate nitrogen,
And anaerobic conditions are formed by the depletion of nitrite nitrogen,
The intracellular phosphorus is released using the organic matter of the influent water 1 remaining after the nitrogen removal as a carbon source. The residence time in the anoxic and anaerobic tank 3 is within one hour based on the inflow rate, and is desirably about one hour.

The sludge and sedimentation tank sludge flowing out of the oxygen-free and anaerobic tank 3 flow into the aeration tank 2 by the propulsion generated by air supply. At this time, the lower floor of the sedimentation tank 4 serving as a sedimentation tank, the aeration tank 2 and the oxygen-free and anaerobic tank 3
Is slanted inward at an angle of about 1/10 to 1/20 as described above, so that the sedimentation tank sludge and the transport sludge smoothly move to the aeration tank 2 by the propulsive force of the air supply from the aeration tank 2. Can be done.

After the above process, the aeration tank 2 oxidizes organic substances not removed in the anoxic and anaerobic tank 3 and oxidizes nitrogen components contained in the influent water. A large amount of the released phosphorus and the phosphorus contained in the influent water will be consumed. The aeration tank sludge is again mixed with the influent water 1 by the air supply driving force, flows again into the anoxic and anaerobic tank 3, and continuously repeats such a circulation path. Sludge on the settling tank floor is intermittently removed.

Here, the hydraulic pressure in the aeration tank 2
aulics) The residence time, i.e., the time from inflow of water to retention and exit, is maintained at 4-8 hours, and F / M (Food / Microo
rganism) ratio is maintained at approximately 0.1 kgBOD / kg MLSS · d.

When the inflowing water flowing into the aeration tank 2 is a high-concentration organic substance such as manure or livestock wastewater, it is necessary to maintain the concentration of microorganisms at a high concentration. In this case, sufficient dissolved oxygen is supplied by using a membrane to maintain the concentration of microorganisms at a high level.If the membrane alone does not provide sufficient sludge transfer driving force, the sludge is mixed and transferred. Underwater stirring pump 8 for propulsion
Obtained by On the other hand, when the microorganism concentration is 4000 mg / l or less, a conventional general air diffuser is used to obtain the driving force necessary for oxygen supply and sludge transport.

The microorganisms that have passed through the aeration tank 2 and the oxygen-free and anaerobic tank 3 are separated into solid matter and treated water in a sedimentation tank 4 having a residence time of 2 to 3 hours. Numeral 12 is moved to the upper part, overflowed through the sedimentation tank 4, and then discharged through the ware 6.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in comparison with a conventional apparatus.

First, the air inflow rate was fixed at 30 ml / min,
A general diffuser using a ceramic disk diffuser,
Polysulpho with a pore size of 0.2 μm
ne) The concentration of dissolved oxygen relative to the concentration of microorganisms (MLSS) was compared with the hollow fiber membrane diffuser of the material. In general aeration tubes, the concentration of microorganisms was reduced to less than 2.5 mg / l, which is the appropriate dissolved oxygen concentration in the aeration tank of a biological treatment facility, when the concentration of microorganisms was 6000 mg / l or more, but a microfiltration membrane and an ultrafiltration membrane were used. In this case, the concentration was maintained at 2.5 mg / l or more, and the oxygen supply rate of the membrane air diffuser was very high, indicating that the microorganisms could be maintained at a high concentration.

[0030]

[Table 1]

Next, the method of the present invention is provided in a cross flow manner.
Compare the removal efficiency of organic matter and nitrogen / phosphorus with the conventional method
In order to use the standard activated sludge method,
(A ^Two/ O: Anaerobic tank-anoxic tank-aerobic tank) construction method and book
The method of the invention was operated.

Livestock wastewater having a very high concentration of organic matter and nitrogen / phosphorus is used as influent water, and the treatment flow rate in each step is 500
At l / d, three steps were run in parallel with the same influent.
Table 2 shows the operating conditions of each process, and standard activated sludge (sludg
e) The concentration of microorganisms in the construction method and the Eito method is approximately 4000 mg / l, and in the method of the present invention, the pore size (pore siz
e) Use hollow fiber membrane (Hollow Fiber Membrane) of 0.2μm polysulphone material,
The concentration of microorganisms was maintained between 8000 and 10,000 mg / l.

Table 3 shows the average of the results of the operation performed over a period of approximately six months, and shows the standard activated sludge.
The Aitoo method provided with an anaerobic tank and a denitrification tank step in addition to the aeration tank has a higher removal rate of organic substances, phosphorus and nitrogen than the aeration tank, and can maintain microorganisms at a higher concentration than the Aitoo method. The method of the present invention has excellent removal rates of organic substances, phosphorus, and nitrogen.

[0034]

[Table 2]

Table 3 shows a comparison of the operation results between the standard activated sludge method and the Eito method and the method of the present invention.

[0036]

[Table 3]

Table 4 shows a comparison of the phosphorus content of SVI and sludge between the standard activated sludge method, the Aitoo method and the method of the present invention.

[0038]

[Table 4]

Table 4 shows the sludge sedimentation index of each method and the phosphorus content of the aeration tank sludge. The phosphorus content of the aeration tank sludge is the highest in the method of the present invention, and the sludge sedimentation index is also one. It shows that it is the best.

The present invention described above is not limited by the above-described embodiment and the accompanying drawings, and various substitutions, modifications and changes can be made without departing from the technical scope of the present invention. This will be apparent to those skilled in the art to which the present invention pertains.

[0041]

As described above, according to the present invention, the phosphorus content in the aeration tank sludge is less than 2% in the conventional method in which only the aerobic condition is set, but the anaerobic-aerobic condition is repeated. In the present invention, when the content is 10% or more, the inorganic matter content in the sludge is increased, so that the sludge sedimentation property is improved as compared with the conventional method, and the remaining space other than the circular biological reaction tank is blocked by the air supply, so that the eddy current is reduced. Since generation does not occur, it can be used as a sedimentation basin.

Further, according to the present invention, instead of a conventional air diffuser which generates large air bubbles as an air supply device, a microfiltration membrane or an ultrafiltration membrane (ultrafiltration) which can generate fine air bubbles can be used. Membrane
ane) to improve the oxygen supply rate by microbubbles and maximize the concentration of microorganisms, so that not only sewage and wastewater but also high concentrations of organic matter and nitrogen and phosphorus contained in manure and livestock wastewater, etc. Since the removal is done in one reactor,
It is more effective than the conventional method.

Further, since the sludge in the reaction tank is transferred by the propulsive force generated by the air supply, there is an effect that another sludge conveying pump and various related facilities are not required.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a configuration of an embodiment of a sewage and wastewater treatment apparatus for biological reaction according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inflow water 2 aeration tank 3 anoxic and anaerobic tank 4 sedimentation tank 5 diffuser tube 6 overflow clothing 7 mixing guide plate 8 underwater stirring pump 9 first holding stand 11 blower 12 treated water 13 sludge floating prevention net 14 second holding stand 15 Lid

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ike Ise, Korea 2311 Daehwa-dong, Ilsan-gu, Gosan-si, Republic of Korea (72) Inventor Lee Kyung-ho In Korea, 2311 Daehwa-dong, Ilsan-gu, Goyang-si, Korea In-house Research Institute (72) Inventor Kim Dong-Key 2311 Dahua-dong, Ilsan-gu, Goyang-si, Republic of Korea In-house Research Institute of Technology (72) Inventor Li Chang-Akira 400 Kiin-dong, Ansan-si, Gyeonggi-do, Republic of Korea Within Kogyo Kogyo Co., Ltd. (72) Inventor ▲ One ▼ Jin-Hong 400 Kinai-dong, Ansan-si, Gyeonggi-do, Republic of Korea Inside Kogyo Water Purification Kogyo Co., Ltd. (56) References 62-160191 (JP, A) JP-A-63-137743 (JP, A) JP-A-3-14611 (JP, A) JP-A-7-116682 (JP, A) JP-A-56-95395 (JP, A) A) Japanese Utility Model Showa 62-174695 (JP, U) Shokai Sho 17-17905 (JP, U) Shokai Sho 53-26567 (JP, U) Tokuhyo Hei 7-507714 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) ) C02F 3/30-3/34

Claims (25)

(57) [Claims] An aeration tank for bringing an air component into contact with a mixed liquid of activated sludge, and a predetermined mixture such that inflow water flowing into the aeration tank and the aerated tank sludge mixed liquid are transported while being in contact with each other. A bubble providing means for forming bubbles while having a transport driving force of a size, and covering the outside of the aeration tank, containing the inflow water and the aeration tank sludge mixture flowing over the outside of the aeration tank, and performing a biological reaction. Anoxic and anaerobic tanks that simultaneously remove nitrogen and simultaneously release phosphorus, and cover the outside of the anaerobic and anaerobic tanks and flow out and settle while circulating between the aeration tanks and the anaerobic and anaerobic tanks. look including a settling tank for containing the sludge, the lower anoxic and anaerobic tank, extends below the aeration tank
And the bubble providing means is disposed below the aeration tank and
To generate the transport propulsion to the anaerobic and anaerobic tanks
The sludge discharged from the tank and the sludge from the settling tank
It is configured to flow into the aeration tank from below
Sewage by biological response characterized by, wastewater treatment apparatus. 2. The inflowing water flows to an upper part of the aeration tank.
2. The method according to claim 1, wherein
Sewage and wastewater treatment equipment by biological reaction. 3. A mixing guide plate mounted on the inner surface of the oxygen-free and anaerobic tank so that the inflow water flowing through the aeration tank and the sludge mixture are completely mixed. Sewage and wastewater treatment equipment by biological reactions. 4. A lower section of the aeration tank, anoxic and anaerobic tank, and a settling tank is provided on a horizontal portion and on both sides of the horizontal portion.
And the boundary between the horizontal part and the circular part
The tangent at the boundary is 1/10 inward of the horizontal part
The sewage and wastewater treatment apparatus according to claim 1, which has a shape inclined by 1/20 . 5. The sewage and wastewater treatment apparatus according to claim 1, wherein the aeration tank further includes a submersible agitating pump for providing a mixing force and a transport driving force of the sludge on an upper side thereof. Wherein said bubble providing means, sewage by biological response according to any of one of claims claims 1-5 comprising a membrane having a large number of fine pores, wastewater treatment apparatus. 7. The apparatus for treating sewage and wastewater by a biological reaction according to any one of claims 1 to 5 , wherein the bubble providing means comprises an air diffuser. 8. The membrane, microfiltration membrane, or sewage by biological reactions according to claim 6, wherein formed in one one of the ultrafiltration membrane, the waste water treatment apparatus. 9. The aeration tank and the anaerobic and anaerobic tanks are each formed of a double tube having one of a cylindrical box and a polygonal box having open upper and lower portions. Sewage and wastewater treatment equipment by biological reactions. 10. The apparatus for treating sewage and wastewater by a biological reaction according to claim 1, further comprising a first holding table for supporting a space between the aeration tank and the oxygen-free and anaerobic tank. 11. The apparatus for treating sewage and wastewater by a biological reaction according to claim 1, further comprising a second holding table for supporting an oxygen-free and anaerobic tank in an inner space of the settling tank. 12. The apparatus according to claim 1, further comprising a sludge floating preventing means mounted at a predetermined position between the sedimentation tank and the oxygen-free and anaerobic tank to prevent the sludge from floating when the treated water is discharged. Item 6. An apparatus for treating sewage and wastewater by a biological reaction according to any one of Item 5 . 13. is mounted on the outer peripheral surface of the settling tank, from claim 1, further comprising an overflow wear released to the outside to accommodate the overflow flowed treated water according to one of any one of claims 5 Sewage and wastewater treatment equipment by biological reaction. 14. The apparatus for treating sewage and wastewater by a biological reaction according to claim 1, further comprising a lid mounted on an upper part of the sedimentation tank to prevent inflow of rainwater or the like. 15. A first stage in which inflow water including sewage and wastewater from which contaminants have been removed by a screen flows into an aeration tank, and upwardly blows through an aeration tube attached to a lower part of the aeration tank. > to form a fine bubble by contacting the air component in the influent water to be issued, a second step of causing the conveying thrust upward, the influent and aeration tank sludge flowing into the aeration tank, the
The third stage of transporting the oxygen-free and anaerobic tank, which covers the outside of the aeration tank, by transporting thrust, and removing nitrogen from the influent and sludge mixture flowing into the oxygen-free and anaerobic tank and releasing phosphorus. A fourth step, wherein the sludge and sedimentation tank sludge flowing out of the anoxic and anaerobic tank are re-introduced into the aeration tank from below by the transport propulsion force to oxidize unremoved organic matter and nitrogen components,
A fifth step of ingesting phosphorus, a sixth step in which, after performing the fifth step, the sludge generated in the aeration tank and inflow water flowing from the outside are mixed and recirculated, and a step outside the anoxic and anaerobic tank. Microorganisms in the sedimentation tank
Ri is a solid-liquid separation, sewage by biological reactions comprising a seventh step the sludge is precipitated treated water to be discharged through the overflow wear, wastewater treatment method. 16. In the first stage, the inflow water is
16. The method according to claim 15, wherein the liquid flows into the upper part of the aeration tank.
Sewage and wastewater treatment method by biological reaction described above. 17. The method according to claim 17, wherein the second stage comprises a microorganism concentration (MLSS).
If the concentration is less than 4000mg / l, use a general aeration tube, and if the microbial concentration (MLSS) is higher than 4000mg / l, use a microporous or ultrafiltration membrane The method for treating sewage and wastewater by a biological reaction according to claim 15 , comprising: 18. The third step is, before the organic matter influent flowing into the aeration tank is oxidized under aerobic conditions, claim claim 15 including the step of causing flow Yue anoxic and anaerobic tank
18. A method for treating sewage and wastewater by the biological reaction according to any one of 17 . 19. The third step includes a step of transporting the inflow water and the sludge mixture to the oxygen-free and anaerobic tank by the transport driving force of the fine bubbles ejected from the air diffuser.
The method according to any one of claims 15 to 17,
Sewage by biological response, wastewater treatment method. 20. The third stage, if insufficient transport driving force of the fine bubbles, claim 15 including the step of conveying the water stirred pump the influent water and the sludge mixture is moved in the anoxic and anaerobic tank To any one of claims 17 to 17
A method for treating sewage and wastewater by the biological reaction as described . 21. The fourth step comprises removing nitrate nitrogen and nitrite nitrogen by reducing them to nitrogen gas in the upper part of the anoxic and anaerobic tank, and forming anaerobic conditions in the lower part to remove nitrogen. 16. The method according to claim 15 , further comprising the step of releasing intracellular phosphorus using the remaining influent water organic matter as a carbon source after required.
Item 18. A method for treating sewage and wastewater by a biological reaction according to any one of Item 17 . 22. The method according to claim 15 , wherein the fourth step includes a step of completely mixing the inflow water and the aeration tank sludge by a mixing guide plate attached to the anoxic and anaerobic tank in a zigzag manner.
A method for treating sewage and wastewater by the biological reaction according to claim 17 . 23. The method according to claim 15 , wherein the fourth step includes a process in which the residence time in the anoxic and anaerobic tank is within one hour based on the inflow rate.
A method for treating sewage and wastewater by the biological reaction described in the paragraph . 24. The method according to claim 15, wherein the fifth step includes a step in which the sludge is re- flowed into the aeration tank by the transport driving force generated by the air supply.
A method for treating sewage and wastewater by a biological reaction according to any one of the preceding claims. 25. The fifth step comprises maintaining the hydraulic residence time in the aeration tank at 4 to 8 hours and adjusting the F / M ratio to approximately 0.1 kg BOD / kg.
16. The method according to claim 15 , including a step of maintaining the MLSS.d.
7. A method for treating sewage and wastewater by a biological reaction according to any one of 7 above .