KR100893122B1 - Wastewater Advanced Treatment System and Treatment Method - Google Patents

Abstract

The present invention relates to a first anoxic tank for denitrifying nitrate nitrogen in wastewater, an aerobic tank connected to the first anoxic tank to oxidize and nitrify organic matter, and an untreated water connected to the aerobic tank and introduced from the aerobic tank. A second anoxic tank for further denitrification of nitrate nitrogen, a membrane separation tank for oxidizing residual organic matter, nitrification, and solid-liquid separation of treated water and microorganisms in the membrane separation tank; A membrane module for separating the treated water and the sludge, a first conveying line for conveying activated sludge in the aerobic tank to the first anoxic tank, and a membrane separating tank, and a second conveying line from the membrane separating tank. A sludge denitrification tank which removes some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced by The waste water passed through the first anoxic tank and the aerobic tank is further subjected to a second anoxic tank, a membrane separation aerobic tank, and a sludge denitrification tank, thereby continuously providing an anaerobic-aerobic condition to the microorganisms in the wastewater and the wastewater. The present invention relates to an advanced wastewater and wastewater treatment apparatus and a treatment method using the same, by repeatedly removing nitrogen, phosphorus and organic matter therein, thereby improving wastewater treatment efficiency.

Wastewater treatment, aerobic tank, anaerobic tank, membrane separation tank

Description

High Effective Treatment Apparatus and Method of Sewage and Wastewater

1 is a schematic conceptual view of an apparatus for treating high wastewater according to the present invention.

Figure 2 is a schematic side view of an enlarged one side upper end of the membrane separation tank according to the present invention.

3 is a schematic perspective view of the wastewater advanced treatment apparatus according to the present invention.

      <Explanation of symbols for the main parts of the drawings>

1 Screen 2 Screen Tank 3 Inlet Tube 4 Inlet Valve

5 Outflow pump 6 First conveying line 7 Second conveying line 8 Underwater stirrer 9 Blower 10 Immersion type membrane

11 Sludge denitrification tank 12 First anoxic tank 13 Angi tank 14 Second anoxic tank 15 Membrane separation tank 16 Water level control system

17 Sludge drawing pump 18 External carbon injection device

19 Membrane Separation Tank One side Upper part 20 Opening

21 sluice 100 sewage and wastewater treatment system

The present invention relates to a wastewater treatment apparatus using an immersion type membrane, and specifically, through a first anoxic tank, an aerobic tank, a second anoxic tank, a membrane separation tank, and a sludge denitrification tank, nitrogen, phosphorus, and organic matter in the wastewater are collected. The present invention relates to a wastewater treatment apparatus for improving purification efficiency by repeatedly purifying and a wastewater treatment method using the same.

Water is an essential substance that maintains the life of all living things on the earth, and it descends to the surface of the earth through snow or rain through the water cycle. In Korea, rainfall is concentrated according to regions or seasons and is considered a finite resource. The dirty water used and thrown away by human beings was purified by the self-cleaning action, which is the principle of nature, and returned to the natural world to play a role in maintaining the ecosystem.However, after the industrial revolution, water pollution became serious due to urbanization and industrial development due to population concentration. As a result, there is a growing need for active development of ways to recycle wastewater and wastewater economically.

The important point in recycling wastewater is to treat nitrogen, phosphorus and organic matters, water turbidity, pH, etc. in recycled wastewater to the required level, and to remove pathogenic microorganisms and to make it environmentally stable. to be.

Nitrogen or phosphorous from agricultural fertilizers, manure or livestock manure, or synthetic detergents can enter the water system, causing eutrophication, coastal red tide, fish toxins in ammonia, and dissolved oxygen deficiency in water. Increases the demand for chlorine and can also affect health by causing diseases such as cyanosis when high levels of nitrate nitrogen are present in drinking water. In addition, the algae overgrowth due to the inflow of water sources such as nitrogen and phosphorus may cause unpleasantness in taste and smell of tap water.It may cause clogging of sand filter paper, which is a water purification process. It can create and impair human health.

As such, the inflow of nitrogen and phosphorus into the water system causes problems such as economic loss caused by the increase in the purification cost, difficulty in securing safe and clean water resources for public health, and thus, blocking the inflow of nutrients into the water system is essential. As the most fundamental solution, the treatment of nitrogen and phosphorus as well as the removal of organic matter from wastewater and livestock wastewater is emphasized more.

For the treatment of nitrogen and phosphorus, a membrane bioreactor (MBR) has been developed that combines advanced processing and biological treatment for the treatment of pathogenic microorganisms and suspended solids.

A conventional membrane bioreactor is composed of an oxygen-free tank, an aerobic tank, and a membrane module installed in the aerobic tank. In the anoxic tank, a high concentration of sludge layer is provided to perform denitrification of the inflowing wastewater and to remove organic matter. In addition, organic matter and phosphorus are removed by the microorganisms of an aerobic tank, and wastewater and wastewater flowing in from an anaerobic tank are solid-liquid-separated from treated water and microorganisms by the membrane module installed in an aerobic tank.

The conventional membrane bioreactor is composed of an anoxic tank for denitrifying nitrate nitrogen using organic materials and an aerobic tank for converting ammonia nitrogen to nitrate nitrogen, and treated water from which the organic material is removed through the membrane module in the aerobic tank. Is transported to a storage tank, and water mixed with sludge from the aeration tank is returned to the anoxic tank.

In order to remove nitrogen biologically, in most processes, the reaction tank is disposed in the order of anoxic tank and aerobic tank, and the nitrate nitrogen generated in the aerobic tank is transferred to the anoxic tank by using an internal transfer pump and piping. Since the amount of organic matter in the waste water is limited, the denitrification efficiency is also limited, and the untreated amount is generally discharged to the treated water.

Since the nitrogen removal rate is greatly influenced by the water temperature of the reactor, the concentration of microorganisms, the characteristics of the influent, the time, the season, etc., it is very difficult to control the nitrogen concentration of the treated water below the regulated level, and therefore, if the temperature exceeds the limit, the anaerobic tank is primarily used. An additional external carbon source is added to the reactor to improve the denitrification rate and to control nitrogen in the aerobic tank to remove nitrogen on a limited basis. However, since the nitrate nitrogen, which is internally returned from the aerobic tank and flows out to the treated water, is essentially limited in nitrogen removal. Therefore, when the inflow C / N ratio is very low, or when stable treatment is required all year round such as nitrogen 5 mg / L or less, phosphorus 0.5 mg / L or less, existing nitrogen and phosphorus removal processes are difficult to process and additional processes are required. Additional installation and operating costs are required.

The present invention was developed to overcome the limitations of nitrogen treatment of conventional membrane bioreactor as described above, and can treat the nitrogen of the treated water to the target water quality even if the C / N ratio is low, and does not need to install additional facilities. An object of the present invention is to provide an advanced wastewater and wastewater treatment apparatus and treatment method capable of removing phosphorous and organic matter.

In order to achieve the above object, in the present invention, the first anoxic tank for denitrifying the nitrate nitrogen in the waste water, the aerobic tank is connected to the first anoxic tank and organic matter oxidation and nitrification occurs, and is connected to the aerobic tank, A second anoxic tank for further denitrification of the nitrate nitrogen in the untreated water flowing from the aerobic tank, and a membrane separation tank for oxidizing residual organic matter, nitrifying, and solid-liquid separation of the treated water and microorganisms. And a membrane module installed in the membrane separation aeration tank to separate the treated water and the sludge, and a first conveying line for returning the activated sludge in the aerobic tank to the first anoxic tank, wherein the first anoxic tank and the aerobic tank are included. The wastewater from the wastewater has passed through the second anoxic tank and the membrane separation tank to be free of microorganisms in the wastewater. Small - by providing aerobic conditions in a row, five-to repeatedly remove the nitrogen, phosphorus and organic matter in the waste water, O, it provides a wastewater treatment device height, characterized in that to increase the efficiency of wastewater treatment.

In addition, the present invention is connected to the membrane separation tank, the sludge denitrification tank to remove some of the nitrate nitrogen and residual dissolved oxygen in the activated sludge flowing from the membrane separation tank, by connecting the membrane separation tank and the sludge denitrification tank And a second conveying line for conveying the activated sludge in the membrane separation tank to the sludge denitrification tank.

In addition, in the present invention, the sludge denitrification tank and the first sludge denitrification tank, which are connected to the membrane separation tank, are provided with a sludge denitrification tank for removing some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced from the membrane separation tank. The anoxic tank, the aerobic tank, the second anoxic tank, and the membrane separation tank are arranged in parallel, and the membrane separation tank is disposed adjacent to the sludge denitrification tank, and floats on the surface of the membrane separation tank via the opening provided at the top of the membrane separation tank. Provided is an advanced wastewater treatment system, characterized in that activated sludge is conveyed internally to the sludge denitrification tank.

In addition, in the present invention, the first anoxic tank for denitrifying the nitrate nitrogen in the waste water, an aerobic tank connected to the first anoxic tank to oxidize and nitrify the organic matter, and the untreated tank connected to the aerobic tank and flowed in from the aerobic tank A second anoxic tank for further denitrification of the nitrate nitrogen in the water, a membrane separation aerobic tank connected to the second anoxic tank to oxidize residual organic matter, nitrification, and solid-liquid separation of the treated water and microorganisms, and the membrane separation A membrane module installed in the aeration tank to separate the treated water and the sludge, a first conveying line for transporting the activated sludge in the aerobic tank to the first anoxic tank, and connected to the membrane separation tank, and introduced from the membrane separation tank. It consists of a sludge denitrification tank which removes some nitrate nitrogen and residual dissolved oxygen in the activated sludge. Is a method for treating wastewater using an advanced wastewater treatment system. The wastewater is subjected to a first anaerobic tank, an aerobic tank, a second anoxic tank, a membrane separation tank, and a sludge denitrification tank. By continuously providing anoxic-aerobic conditions to microorganisms, there is provided a method for advanced wastewater treatment, characterized in that nitrogen, phosphorus and organic substances in the wastewater are repeatedly removed to increase the wastewater treatment efficiency.

As for the mechanism of nitrogen and phosphorus removal in water, nitrogen exists in water in the form of proteins, amino acids, organic nitrogen such as urea, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. Organic nitrogen contaminated in water is decomposed into ammonia nitrogen by the action of microorganisms and then oxidized to nitrate nitrogen through nitrite nitrogen.Inorganic microorganisms living in water are inorganic such as ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. Nitrogen is used as a nutrient to multiply. In the present invention, the aerobic tank and the membrane separation aerobic tank are reaction tanks that provide an aerobic environment and decompose ammonia nitrogen into nitrate nitrogen. In the present invention, the first anoxic tank, the second anoxic tank, and the sludge denitrification tank are reaction tanks that provide an oxygen-free environment, and serve to remove nitrogen by denitrifying nitrate nitrogen.

In water, phosphorus is present in the form of organic phosphorus such as protein, ATP, phosphorous phosphate and polyphosphorus phosphate. Such phosphorus is converted to phosphate in water and used by algae. If the amount is too large, the COD increases due to the overgrowth of algae, causing water pollution. In the present invention, phosphorus is partially removed in the anoxic environment of the first anoxic tank, the second anoxic tank, and the sludge denitrification tank and the membrane separation tank, and most of the phosphorus is removed in the aerobic tank by biological and chemical methods.

Hereinafter, with reference to the accompanying drawings will be described a specific configuration and effect of the wastewater treatment apparatus and treatment method according to the present invention.

1 is a schematic conceptual diagram of an apparatus for treating high wastewater according to the present invention. The treatment apparatus 100 according to the present invention includes: a first anoxic tank 12 for denitrifying nitrate nitrogen; An aerobic tank 13 connected to the organic material oxidizing and nitrifying; A second anoxic tank 14 connected to the aerobic tank 13 for further denitrification of nitrate nitrogen; A membrane separation aeration tank 15 connected to the second anoxic tank 14 to oxidize residual organic matter, nitrification occurs, and solid-liquid separation of treated water and microorganisms; A membrane module (10) installed in the membrane separation tank (15) to separate treated water and sludge; A first conveying line (6) for conveying activated sludge in the exhalation tank (13) to the first anoxic tank (12); A sludge denitrification tank (11) connected to the membrane separation tank (15) and for removing some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced from the membrane separation tank (15); It includes a second conveying line (7) for connecting the membrane separation tank 15 and the sludge denitrification tank (11).

On the other hand, the treatment apparatus according to the present invention, the sludge denitrification tank (11) in which the nitrate nitrogen in the membrane separation tank (15) is conveyed and denitrified; and the membrane separation tank (15) and the sludge denitrification tank ( 11) may be provided with a second conveying line (7) for connecting. In addition, a screen tank 2 having a screen 1 for filtering contaminants contained in the waste water before the waste water is introduced into the first anaerobic tank 12 may be further provided. In addition, the treatment apparatus according to the present invention includes an inlet pipe (3) to allow the waste water that has passed through the screen tank (2) to the sludge denitrification tank (11) and the first anoxic tank (12); The inlet pipe (3) may further include an inlet valve (4) for distributing and adjusting the inflow water from the sludge denitrification tank (11) and the first anoxic tank (12). Blower (9) is connected to the exhalation tank (13) and the membrane separation exhalation tank (15), and an air vent device for supplying oxygen in the exhalation tank (13) and the membrane separation exhalation tank (15) may be provided, respectively. The sludge denitrification tank 11, the first anoxic tank 12, and the second anoxic tank 14 may each be provided with an underwater stirrer 8 to prevent dead space from occurring on one side and sludge deposited on the lower side. have.

Looking at the waste water purification method using the treatment apparatus of the present invention as described above, first, the waste water is passed through the screen tank (2) having the screen (1). The screen tank (2) is provided with a screen (1) for filtering contaminants such as sand or gravel contained in the waste water, and serves to filter the contaminants of the waste water before entering the reactor. The spacing of the screen 1 is usually 1 to 2 mm and the shape or spacing of the screen 1 is not limited.

The waste water passing through the screen tank 2 is introduced into the sludge denitrification tank 11 and the first anoxic tank 12 through an inflow pipe 3, and undergoes a treatment process. 2 flows into the anoxic tank 14 and the membrane separation tank 15 and is repeatedly processed. The inflow pipe (3) is configured to flow into the sludge denitrification tank (11) and the first anoxic tank (12) to flow in the waste water passed through the screen tank (2), each inlet pipe (3) It may include a configuration in which the inlet valve (4) for adjusting the amount of incoming waste water is installed. In addition, in the present invention, the reaction tank may be provided with a water level measurement sensor 16 for measuring the water level of the reaction tank, according to the water level value measured by the water level measurement sensor 16 and the predetermined level value A control unit may be further provided to control the inlet valve 4 installed on the inlet pipe 3 to adjust the amount of waste water introduced into the reactor.

When the wastewater flows into the first anoxic tank 12 through the screen tank 2, the first anoxic tank 12 denitrates the nitrogenous acid to be decomposed and treated with nitrogen gas using a carbon source in the wastewater. As a result, a reaction occurs to remove nitrogen. In addition, the process of denitrifying and removing the nitrate nitrogen internally conveyed from the aerobic tank 13 through the first conveying line 6 and the oxidation reaction of some organic substances also occur in the first anoxic tank 12. Is removed through the first anaerobic tank 12 and the aerobic tank 13. At this time, it is preferable to provide an underwater stirrer 8 in the dead space formed in the first anoxic tank 12 and in the first anoxic tank 12 in order to prevent the lower deposition of the sludge.

In the aerobic tank 13, untreated water is introduced from the first anoxic tank 12, and in the aerobic tank 13, a reaction in which the organic matter in the inflowed untreated water is oxidized and a nitrification reaction in which ammonia nitrogen is converted to nitrate nitrogen occur simultaneously. In addition, a phosphorus removal reaction occurs in the aerobic tank 13, and the phosphorus is biologically removed using microorganisms in the untreated water. If the phosphorus concentration in the untreated water does not reach the target concentration by the biological method alone, the aerobic tank 13 is removed. Target water quality can be achieved by direct injection of flocculants to remove phosphorus by chemical means. In this case, the exhalation tank 13 is connected to the blower (9) is provided with an air dispersing device for supplying oxygen in the exhalation tank (13), the air bubbles generated by the air blower connected to the blower (9) is an exhalation tank (13) It supplies dissolved oxygen in) and promotes nitrification reaction.

The untreated water treated in the aerobic tank 13 flows into the second anoxic tank 14. In the second anoxic tank 14, since the nitrate nitrogen introduced from the aerobic tank 13 is removed using endogenous denitrification or an external carbon source, it is possible to control the nitrogen concentration of the treated water according to the input amount of the external carbon source. In this case, as in the first anoxic tank 12, the second anoxic tank 14 is also provided with an underwater stirrer 8 to prevent the dead space from being formed and to be deposited under the sludge second anoxic tank 14. It is preferable. In this way, by providing the second anoxic tank 14 connected to the aerobic tank 13, it is possible to further denitrate nitrate nitrogen not removed from the first anoxic tank 12, it is possible to remove nitrogen with high efficiency.

The untreated water denitrated in the second anoxic tank 14 flows into the membrane separation tank 15. In the membrane separation vessel 15, a membrane module 10 having a plurality of micromembrane is installed, and the inflow water passes from the lower part of the membrane module 10 to the upper part to filter particulate matter in the water by the micromembrane. And further organic removal reactions and nitrification and dephosphorization reactions take place. An upper portion of the membrane module 10 is provided with an outlet pump 5 for moving the treated water passing through the membrane module 10 to the treated water tank through the outlet pipe. In this case, an air diffuser may be installed at the bottom of the membrane separation vessel 15 or at the bottom of the membrane module 10. The air diffuser is connected to the blower (9), and serves to promote the nitrification reaction by supplying dissolved oxygen by generating bubbles in the membrane separation tank (15). In addition, the sludge is prevented from adhering to the membrane surface of the membrane module 10 while passing from the lower part of the membrane module 10 to the upper part. The blower 9 connected to the membrane separation tank 15 may be connected to the blower 9 connected to the exhalation tank 13 in the same line or in a plurality of lines.
The untreated water of the membrane separation tank 15 is returned to the sludge denitrification tank 11 through the second conveying line 7. The sludge denitrification tank 11 denitrifies and removes nitrate nitrogen in the untreated water returned through the second conveying line 7 from the membrane separation tank 15 and removes the residual dissolved oxygen in the water. Maximize the use of carbon sources in the influent in 12). As such, through efficient use of a limited carbon source, it is possible to increase the nitrogen removal efficiency irrespective of the influent C / N ratio. In the sludge denitrification tank 11, it is preferable that an underwater stirrer 8 is provided, as in the first anoxic tank 12 and the second anoxic tank 14.

In addition, as shown in FIG. 3, the membrane separation tank 15 and the sludge denitrification tank 11 are arranged adjacent to each other so that the membrane separation tank 15 floats on the surface of the membrane separation tank without the second conveying line 7. It is also possible for the sludge to be conveyed internally to the sludge denitrification tank 11. In this case, as shown in FIG. 2, the one side upper end 19 of the membrane separation vessel 15 is preferably provided with an opening 20. Due to the air bubbles generated in the lower portion of the membrane separation vessel 15 or the air diffuser at the bottom of the membrane module 10, water flow from the lower portion of the membrane separation vessel 15 to the upper portion causes waves to form on the surface of the membrane separation vessel 15. The generated wave pushes water to the side wall of the membrane separation tank 15, and a part of the pushed water passes through the opening 20 provided at one upper end portion 19 of the membrane separation tank 15. The untreated water passing through the opening 20 is returned to the sludge denitrification tank 11, where a portion of the activated sludge floating on the water surface of the membrane separation tank 15 together with the water is passed through the opening 20. Is returned. The openings 20 provided in one side upper end portion 19 of the membrane separation tank 15 may be opened and closed by the water gate 21 to adjust the amount of water and sludge conveyed.

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As described above, according to the wastewater treatment system and treatment method according to the present invention, by repeatedly treating nitrogen in inflow water through the first and second conveying lines, nitrogen of the treated water is reduced even if the C / N ratio in the inflow water is low. There is an advantage that can be controlled to less than 5mg / L.

In addition, since the configuration of the device does not require a separate sedimentation basin or a subsequent filtration device, it is possible to reduce the size of the wastewater treatment device, thereby minimizing the use site for installing the device.

In addition, although a separate pump is conventionally installed to convey the sludge to be conveyed from the aerobic tank to the anoxic tank, in the present invention, since the separate power is not required to convey the conveying sludge inside, the operating power of the facility can be reduced.

 In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this, it is possible to be freely modified according to the technical idea of the present invention.

Claims (4)

delete First anoxic tank 12 into which wastewater flows in and denitrates the nitrate nitrogen in the wastewater, An aerobic tank (13) connected to the first anoxic tank (12) for organic material oxidation and nitrification, A second anoxic tank 14 which is connected to the aeration tank 13 and further denitrates the nitrate nitrogen in the untreated water flowing from the aeration tank 13; A membrane separation aeration tank 15 connected to the second anoxic tank 14 to oxidize residual organic matter, nitrification occurs, and solid-liquid separation between the treated water and microorganisms; Installed in the membrane separation tank 15, the membrane module 10 for separating the treated water and sludge, A first conveying line 6 for conveying activated sludge in the exhalation tank 13 to the first anoxic tank 12; A sludge denitrification tank (11) connected to the membrane separation tank (15) and removing some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced from the membrane separation tank (15); A second conveying line 7 which connects the membrane separation tank 15 and the sludge denitrification tank 11 and conveys the activated sludge in the membrane separation tank 15 to the sludge denitrification tank 11. Is composed, The waste water passed through the first anoxic tank 12 and the aerobic tank 13 is further passed through a second anoxic tank 14, a membrane separation tank 15, and a sludge denitrification tank 11, thereby anoxic to microorganisms in the wastewater. -By providing continuous aerobic conditions, nitrogen, phosphorus and organic matter in the waste water is repeatedly removed to increase the waste water treatment efficiency. First anoxic tank 12 into which wastewater flows in and denitrates the nitrate nitrogen in the wastewater, An aerobic tank (13) connected to the first anoxic tank (12) for organic material oxidation and nitrification, A second anoxic tank 14 which is connected to the aeration tank 13 and further denitrates the nitrate nitrogen in the untreated water flowing from the aeration tank 13; A membrane separation aeration tank 15 connected to the second anoxic tank 14 to oxidize residual organic matter, nitrification occurs, and solid-liquid separation between the treated water and microorganisms; Installed in the membrane separation tank 15, the membrane module 10 for separating the treated water and sludge, A first conveying line 6 for conveying activated sludge in the exhalation tank 13 to the first anoxic tank 12; A sludge denitrification tank (11) connected to the membrane separation tank (15) and removing some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced from the membrane separation tank (15), The sludge denitrification tank 11, the first anoxic tank 12, the aerobic tank 13, the second anoxic tank 14 and the membrane separation aeration tank 15 are arranged in parallel, the membrane separation aeration tank 15 is the sludge denitrification The sludge denitrification tank 11 is disposed adjacent to the tank 11 and floats on the water surface of the membrane separation tank 15 through the opening 20 provided in the upper portion 19 of the membrane separation tank 15. The wastewater advanced treatment apparatus, characterized in that it is conveyed internally. A first anoxic tank 12 into which wastewater flows in and denitrates the nitrate nitrogen in the wastewater; An aerobic tank (13) connected to the first anoxic tank (12) for oxidizing and nitrifying organic materials; A second anoxic tank 14 connected to the aerobic tank 13 for further denitrifying the nitrate nitrogen in the untreated water flowing from the aerobic tank 13; A membrane separation aeration tank 15 connected to the second anoxic tank 14 to oxidize residual organic matter, nitrification occurs, and solid-liquid separation of treated water and microorganisms; A membrane module (10) installed in the membrane separation tank (15) to separate treated water and sludge; A first conveying line (6) for conveying activated sludge in the exhalation tank (13) to the first anoxic tank (12); And a sludge denitrification tank (11) connected to the membrane separation tank (15) and including a sludge denitrification tank (11) for removing some nitrate nitrogen and residual dissolved oxygen in the activated sludge introduced from the membrane separation tank (15). As a method of treating sewage and wastewater using an advanced treatment device, The waste water is passed through the first anoxic tank 12, the aerobic tank 13, the second anoxic tank 14, the membrane separation tank 15, and the sludge denitrification tank 11, so that the microorganisms in the waste water are anaerobic- A wastewater advanced treatment method characterized by continuously providing aerobic conditions to repeatedly remove nitrogen, phosphorus and organic matter in the wastewater, thereby increasing the wastewater treatment efficiency.

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