Improved AOA + rear micro-aeration synchronous nitrogen and phosphorus removal system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to an improved AOA and post-positioned micro-aeration synchronous nitrogen and phosphorus removal system which comprises a water inlet tank, an anaerobic reaction tank, an aerobic reaction tank, an anoxic reaction tank and a sedimentation tank which are sequentially communicated through water pipes, the volume ratio of the anaerobic reaction tank to the aerobic reaction tank to the anoxic reaction tank to the micro-aeration area is 3: 4: 6: 2, and the sedimentation tank is communicated with the front end of the anaerobic reaction tank through a return pipe. Compared with the prior art, the device disclosed by the utility model has the beneficial effects that carbon storage and endogenous denitrification in cells are enhanced through anaerobic reaction and anoxic reaction, so that advanced nitrogen and phosphorus removal is realized; filler is added into the aerobic zone, a micro-anoxic environment is formed in a biological membrane attached to the filler, denitrification phosphorus removal can be carried out, synchronous denitrification and phosphorus removal are realized, micro-aeration is carried out at the tail end of the anoxic zone, and the problem of poor sludge settling performance of a traditional AOA process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an improved AOA+post-micro-aeration synchronous nitrogen and phosphorus removal system. Background Art

[0002] In the field of wastewater treatment technology, the traditional AOA process has shown significant advantages in comprehensive wastewater treatment. The traditional AOA process is conducive to the simultaneous removal of organic matter, nitrogen, phosphorus and other pollutants under anoxic, anaerobic and aerobic conditions, improving the treatment efficiency of wastewater. It does not require the addition of external carbon sources, saving energy. 2 The O process saves energy consumption for nitrification liquid reflux and is more convenient for operation and management.

[0003] Although the AOA process has many advantages in theory, in practical applications, problems especially regarding sludge settling performance have become key factors restricting its effectiveness. Poor sludge settling performance may lead to turbid effluent and reduced treatment efficiency, and additional measures are needed to improve sludge settling performance. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the utility model provides an improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system, anaerobic reaction and anoxic reaction, strengthen intracellular carbon storage and endogenous denitrification, and realize advanced denitrification and phosphorus removal; micro-aeration is performed at the end of the anoxic zone to improve the problem of poor sludge settling performance of the traditional AOA process.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] An improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system comprises a water inlet tank, an anaerobic reaction tank, an aerobic reaction tank, an anoxic reaction tank, and a sedimentation tank which are sequentially connected through a water pipe, a micro-aeration zone is arranged at the end of the anoxic reaction tank, and the volume ratio of the anaerobic reaction tank, the aerobic reaction tank, the anoxic reaction tank, and the micro-aeration zone is 3-4:4-5:6-9:2-3, and the sedimentation tank is connected to the front end of the anaerobic reaction tank through a reflux pipe.

[0007] Furthermore, fillers are added into the aerobic reaction tank.

[0008] Furthermore, the filler is propylene.

[0009] Furthermore, the filling volume ratio of the filler is 15%.

[0010] Furthermore, the volume ratio of the anaerobic reaction tank, the aerobic reaction tank, the anoxic reaction tank, and the micro-aeration zone is 3:4:6:2.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The utility model prolongs the anaerobic reaction and the anoxic reaction, strengthens the intracellular carbon storage and the endogenous denitrification, and realizes the advanced nitrogen removal and phosphorus removal.

[0013] 2. Add fillers in the aerobic zone to form a micro-anoxic environment inside the biofilm attached to the fillers, which can carry out denitrification and phosphorus removal, achieving simultaneous nitrogen and phosphorus removal.

[0014] 3. A micro-aeration zone is added at the end of the anoxic reaction tank to improve the sedimentation performance of the sludge and facilitate the separation of mud and water in the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] The numbers shown in the accompanying drawings are: 1. water inlet tank; 2. anaerobic reaction tank; 3. aerobic reaction tank; 4. filler; 5. anoxic reaction tank; 6. micro-aeration area; 7. sedimentation tank. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0018] like Figure 1 As shown, an improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system is disclosed, comprising a water inlet tank 1, an anaerobic reaction tank 2, an aerobic reaction tank 3, an anoxic reaction tank 5, and a sedimentation tank 7 which are sequentially connected through a water pipe, a micro-aeration zone 6 is arranged at the end of the anoxic reaction tank 5, and the sedimentation tank 7 is connected to the front end of the anaerobic reaction tank 2 through a reflux pipe. Propylene filler is added to the aerobic reaction tank 3, and the filling ratio is 15%. An aeration device is arranged in the aerobic reaction tank 3.

[0019] Among them, the volume ratio of the anaerobic reaction tank 2, the aerobic reaction tank 3, the anoxic reaction tank 5, and the micro-aeration zone 6 is 3-4:4-5:6-9:2-3, and the preferred volume ratio is 3:4:6:2, which prolongs the anaerobic reaction and the anoxic reaction, strengthens the intracellular carbon storage and endogenous denitrification, and realizes advanced denitrification and phosphorus removal. Fillers are added to the aerobic zone, and a micro-anoxic environment is formed inside the biofilm attached to the fillers, which can carry out denitrification and phosphorus removal, and realize synchronous denitrification and phosphorus removal. At the same time, a micro-aeration zone is added at the end of the anoxic reaction tank, and a micro-aeration device is set in the micro-aeration zone to improve the sedimentation performance of the sludge, which is more conducive to the mud-water separation in the sedimentation tank.

[0020] The specific usage of this system is as follows:

[0021] After the sewage flows from the water inlet tank 1 into the anaerobic reaction tank 2, the polyphosphate bacteria, through the energy generated by hydrolyzing polyphosphate, absorb the VFA existing in the original sewage and part of the organic matter produced by anaerobic hydrolysis and acidification into the body to synthesize the internal carbon source PHA. Polyphosphate bacteria also synthesize PHA; then it enters the aerobic reaction tank 3, where polyphosphate bacteria use part of PHA to aerobic phosphorus absorption, activated sludge neutralizes nitrifying bacteria attached to the biofilm of the filler to convert NH4 + -N is converted to NO3 - -N, while the aerobic reaction tank 3 undergoes simultaneous nitrification and denitrification, and a micro-anoxic environment is formed inside the biofilm attached to the filler 4, which can carry out denitrification and phosphorus removal, thus achieving simultaneous nitrogen and phosphorus removal. In the post-anoxic reaction tank 5, polyphosphate bacteria use the internal carbon source PHA to convert NO3 - -N denitrifies to nitrogen gas, and polyphosphate bacteria utilize internal carbon source PHA to convert NO3 - -N acts as an electron acceptor to further absorb phosphorus in anoxic conditions. At the same time, a micro-aeration zone 6 is set at the end of the anoxic reaction tank, and a micro-aeration device is used for micro-aeration to improve the sedimentation of sludge and facilitate the separation of mud and water in the sedimentation tank. Then the sewage enters the sedimentation tank 7, and the precipitated sludge flows back to the front end of the anoxic reaction tank 2.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An improved AOA+post-micro-aeration synchronous nitrogen and phosphorus removal system, characterized in that: The invention comprises a water inlet tank (1), an anaerobic reaction tank (2), an aerobic reaction tank (3), an anoxic reaction tank (5), and a sedimentation tank (7) which are sequentially connected through a water pipe, wherein a micro-aeration zone (6) is arranged at the inner end of the anoxic reaction tank (5), and the volume ratio of the anaerobic reaction tank (2), the aerobic reaction tank (3), the anoxic reaction tank (5), and the micro-aeration zone (6) is 3-4:4-5:6-9:2-3 ， The sedimentation tank (7) is connected to the front end of the anaerobic reaction tank (2) via a reflux pipe.

2. The improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system according to claim 1, characterized in that: Filler (4) is added into the aerobic reaction tank (3).

3. The improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system according to claim 2 is characterized in that: The filler (4) is propylene.

4. The improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system according to claim 2 or 3, characterized in that: The filling volume ratio of the filler (4) is 15% 。 5. The improved AOA+post-micro-aeration synchronous denitrification and phosphorus removal system according to claim 1, characterized in that: The volume ratio of the anaerobic reaction tank (2), the aerobic reaction tank (3), the anoxic reaction tank (5) and the micro-aeration zone (6) is 3:4:6:2.

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