A zoned internal circulation sequencing batch reactor and wastewater treatment method

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a zoned internal circulation sequencing batch reactor and wastewater treatment method, comprising a reaction zone I and a reaction zone II. Reaction zone I is inoculated with activated sludge and a biofilm carrier is added to enrich anaerobic ammonia-oxidizing bacteria. Reaction zone II is inoculated only with activated sludge. A partition is provided between reaction zones I and II. After influent, the reactor initially operates under anaerobic conditions to complete internal carbon source storage and anaerobic phosphorus release. Subsequently, reaction zones I and II operate under anoxic and aerobic conditions, respectively, forming an internal circulation through an internal circulation pump. This creates an alternating anoxic / aerobic environment for the sludge mixture in reaction zones I and II, removing nitrogen from the water through multiple pathways such as short-cut nitrification / internal carbon source denitrification, short-cut nitrification / anaerobic ammonia oxidation, and nitrification / internal carbon source short-cut denitrification / anaerobic ammonia oxidation. Simultaneously, polyphosphate-accumulating bacteria complete phosphorus uptake, achieving simultaneous nitrogen and phosphorus removal.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a zoned internal circulation sequential batch reactor and a wastewater treatment method. Background Technology

[0002] Excessive discharge of nitrogen and phosphorus from urban sewage leads to eutrophication, accelerating the formation of black and odorous water bodies, and is a major obstacle to water pollution control. Effective treatment of nitrogen and phosphorus in urban sewage is crucial for protecting the aquatic environment. Furthermore, urban sewage treatment processes require extensive aeration to oxidize organic matter and ammonia nitrogen, and often involve the addition of large quantities of chemical agents for denitrification and phosphorus removal, resulting in significant direct and indirect carbon emissions. Therefore, energy conservation, emission reduction, and carbon reduction are urgent needs in urban sewage treatment.

[0003] Intermittent aeration and anaerobic ammonia oxidation denitrification are considered two effective methods to improve wastewater treatment and achieve energy conservation, emission reduction, and carbon reduction. However, these two methods have the following problems in practical applications:

[0004] 1. While intermittent aeration offers advantages such as saving carbon sources, reducing aeration energy consumption and nitrous oxide emissions, reducing sludge volume, improving sludge settling performance, and inhibiting the activity of nitrite-oxidizing bacteria to achieve short-cut nitrification, in sequencing batch reactors (SBRs), intermittent aeration is primarily achieved through frequent start-ups and shutdowns of the air compressor. Frequent start-ups and shutdowns significantly reduce the lifespan of the air compressor.

[0005] 2. Although partial anaerobic ammonia oxidation denitrification in urban wastewater treatment can reduce aeration energy consumption and external carbon source addition, the anoxic biofilm in the wastewater treatment plant is the enrichment and metabolic hot zone of anaerobic ammonia oxidizing bacteria. However, in the sequencing batch reactor, due to the different reaction stages in the sequence, it is difficult to create a continuous and stable anoxic zone, which is not conducive to the enrichment of anaerobic ammonia oxidizing bacteria.

[0006] Therefore, the above-mentioned technical methods are not well-suited for sequencing batch wastewater treatment, and the treatment effect is not ideal. Summary of the Invention

[0007] To address the problems in the prior art, the present invention provides a zoned internal circulating sequential batch reactor and a wastewater treatment method.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a zoned internal circulation sequencing batch reactor and a wastewater treatment method, comprising a reaction zone I and a reaction zone II. Activated sludge is inoculated inside the reaction zone I, and a biofilm carrier (12) is added. The biofilm carrier is used to enrich anaerobic ammonia-oxidizing bacteria. Only activated sludge is inoculated inside the reaction zone II. The volume ratio of the reaction zone I to the reaction zone II is 1:1. A partition is provided between the reaction zone I and the reaction zone II. The upper part of the partition is provided with an internal circulation water passage with a mesh screen. The internal circulation water passage with the mesh screen is used for the circulation of the sludge-water mixture and retains the biofilm carrier inside the reaction zone I.

[0009] The reaction zone I is equipped with a reaction zone I water inlet pipe, a reaction zone I stirring device, an internal circulation water outlet pipe, an internal circulation pump, and a reaction zone I water outlet pipe;

[0010] The reaction zone II is equipped with a reaction zone II inlet pipe, an aeration disc, a reaction zone II mixing equipment, an air compressor, an air volume regulating valve, a reaction zone II outlet pipe, and an internal circulation inlet pipe.

[0011] According to the claim, the internal circulation sequential batch reactor is characterized in that: the inlet pipe of reaction zone I is fixedly installed on the upper part of the outer wall of reaction zone I, the outlet pipe of reaction zone I is fixedly installed on the middle part of the outer wall of reaction zone I, the internal circulation outlet pipe is fixedly installed at the bottom of reaction zone I, the outlet of the outlet pipe is provided with a partition screen, and the internal circulation outlet pipe is connected to the inlet end of the internal circulation pump, the stirring device of reaction zone I is located in the middle of reaction zone I, and the partition is located between reaction zone I and reaction zone II.

[0012] Preferably, the inlet pipe of reaction zone I and the inlet pipe of reaction zone II are used to introduce wastewater into reaction zone I and reaction zone II respectively, and the outlet pipe of reaction zone I and the outlet pipe of reaction zone II are used to discharge the treated wastewater from reaction zone I and reaction zone II respectively.

[0013] Preferably, a wastewater treatment method, using the wastewater treatment apparatus as described in any one of claims 1-4, includes the following steps:

[0014] Step S1: Sludge inoculation. Activated sludge is inoculated into reaction zone I1 and reaction zone II2 until the concentration of activated sludge reaches 2000-4000 mg / L. Then, biofilm carrier 12 is added to reaction zone I1 so that the biofilm carrier 12 filling rate reaches 15-30%.

[0015] Step S2: Set the operating cycle, which is divided into the water inlet stage, anaerobic stage, anoxic / aerobic alternation stage, sedimentation and drainage stage, and idle stage;

[0016] Step S3: During the water intake stage, simultaneously open the inlet pipe 11 of reaction zone I, the inlet pipe 21 of reaction zone II, the internal circulation outlet pipe 14, and the internal circulation inlet pipe 27 to allow sewage to enter reaction zone I1 and reaction zone II2, and maintain the liquid levels in reaction zone I1 and reaction zone II2 at the same level until the water intake stage reaches the set liquid level, then close the inlet pipe 11 of reaction zone I and the inlet pipe 21 of reaction zone II.

[0017] Step S4: During the anaerobic stage, turn on the stirring device 13 in reaction zone I, the stirring device 23 in reaction zone II, and the internal circulation pump 15, adjust the internal circulation flow rate, and control the ratio of the volume of reaction zone I1 to the internal circulation flow rate to be 20-60 min. At this time, the entire reaction device enters the anaerobic reaction stage. Polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria absorb organic matter in the sewage and convert it into intracellular carbon sources. Polyphosphate-accumulating bacteria complete anaerobic phosphorus release until the anaerobic stage reaches the set duration of 2-4 hours.

[0018] Step S5: After the anaerobic stage duration is reached, the anoxic / aerobic alternating stage begins. At this time, the stirring equipment 23 in reaction zone II is turned off, and the air compressor 24 is turned on, so that the entire reaction device enters the anoxic / aerobic alternating reaction stage. In this stage, reaction zone I1 operates under anoxic conditions, and reaction zone II2 operates under aerobic conditions. An internal circulation environment is formed through the internal circulation pump 15, so that the sludge mixture in reaction zone I1 and reaction zone II2 is in anoxic / aerobic alternating environmental conditions, inhibiting the activity of nitrite oxidizing bacteria. At the same time, the anaerobic ammonia oxidizing bacteria are enriched in reaction zone I1 through the biofilm carrier 12. In this reaction stage, nitrogen in the water is removed through multiple pathways such as short-cut nitrification / internal carbon source denitrification, short-cut nitrification / anaerobic ammonia oxidation, and nitrification / internal carbon source short-cut denitrification / anaerobic ammonia oxidation. Meanwhile, polyphosphate-accumulating bacteria complete the phosphorus uptake reaction under aerobic and anoxic conditions, achieving simultaneous and efficient removal of nitrogen and phosphorus until the anaerobic stage duration reaches 4-6 hours.

[0019] Step S6: After the simultaneous removal of nitrogen and phosphorus, the sedimentation and drainage cycle is reached. At this time, the stirring equipment 13, internal circulation pump 15 and air compressor 24 in reaction zone I are turned off, so that the entire reaction device enters the sedimentation stage. After 0.5 to 1 hour, the water outlet pipe 16 of reaction zone I and the water outlet pipe 26 of reaction zone II are turned on to drain the supernatant. After 0.5 to 1 hour, the water outlet pipe 16 of reaction zone I and the water outlet pipe 26 of reaction zone II are turned off, so that the entire reaction device enters the idle stage.

[0020] Step S7: After the entire reaction device enters an idle period of 0.5 to 1 hour, the next wastewater treatment operation command will be issued.

[0021] Compared with existing technologies, the beneficial effects of this invention are: ① This invention achieves simultaneous and efficient nitrogen and phosphorus removal from urban sewage, with effluent exceeding the Class A discharge standard of urban sewage treatment plants, and requires no external carbon source, saving more than 30% in aeration energy consumption. ② This invention provides a continuous and stable anoxic environment for the enrichment of anaerobic ammonia oxidizing bacteria in the sequencing batch reactor (SBR), achieving self-enrichment of anaerobic ammonia oxidizing bacteria under urban sewage quality conditions without inoculation. ③ This invention provides alternating anoxic / aerobic environmental conditions for microorganisms in the SBR through zoned internal circulation, eliminating the need for frequent start-up and shutdown of aeration equipment compared to traditional intermittent aeration, thus facilitating equipment maintenance. ④ This invention has a simple process flow, is easy to operate, and is beneficial for the upgrading and transformation of existing sewage treatment plants, especially SBR processes, possessing application potential and promotional value. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] In the diagram: 1. Reaction Zone I; 11. Inlet pipe of Reaction Zone I; 12. Biofilm carrier; 13. Stirring equipment of Reaction Zone I; 14. Internal circulation outlet pipe; 15. Internal circulation pump; 16. Outlet pipe of Reaction Zone I; 2. Reaction Zone II; 21. Inlet pipe of Reaction Zone II; 22. Aeration disc; 23. Stirring equipment of Reaction Zone II; 24. Air compressor; 25. Air volume regulating valve; 26. Outlet pipe of Reaction Zone II; 27. Inlet pipe of Internal circulation; 3. Baffle; 31. Internal circulation water passage with mesh. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, the present invention provides a zoned internal circulation sequencing batch reactor, comprising a reaction zone I1 and a reaction zone II2. Activated sludge is inoculated inside the reaction zone I, and a biofilm carrier (12) is added. The biofilm carrier is used to enrich anaerobic ammonia-oxidizing bacteria. Only activated sludge is inoculated inside the reaction zone II. The volume ratio of the reaction zone I1 to the reaction zone II2 is 1:1. A partition 3 is provided between the reaction zone I1 and the reaction zone II2. An internal circulation water passage 31 with a mesh is provided on the upper part of the partition 3. The internal circulation water passage 31 with the mesh is used for the circulation of the sludge-water mixture and retains the biofilm carrier inside the reaction zone I.

[0028] In one optional embodiment of this example, the reaction zone I1 is provided with a reaction zone I water inlet pipe 11, a reaction zone I stirring device 13, an internal circulation water outlet pipe 14, an internal circulation pump 15, and a reaction zone I water outlet pipe 16.

[0029] In one optional embodiment of this example, reaction zone II2 is provided with reaction zone II water inlet pipe 21, aeration disc 22, reaction zone II stirring device 23, air compressor 24, air volume regulating valve 25, reaction zone II water outlet pipe 26 and internal circulation water inlet pipe 27.

[0030] In one optional embodiment of this example, the inlet pipe 11 of reaction zone I is fixedly installed on the upper part of the outer wall of reaction zone I1, the outlet pipe 16 of reaction zone I is fixedly installed on the middle part of the outer wall of reaction zone I1, the inner circulation outlet pipe 14 is fixedly installed at the bottom of reaction zone I1, and the inner circulation outlet pipe 14 is connected to the inlet end of the inner circulation pump 15. The stirring device 13 of reaction zone I is located in the middle of reaction zone I1, and the partition 3 is located between reaction zone I1 and reaction zone II2.

[0031] In one optional embodiment, the inlet pipe 11 of reaction zone I and the inlet pipe 21 of reaction zone II are used to introduce wastewater into reaction zone I1 and reaction zone II2 respectively, and the outlet pipe 16 of reaction zone I and the outlet pipe 26 of reaction zone II are used to discharge the treated wastewater from reaction zone I1 and reaction zone II2 respectively.

[0032] The present invention proposes an operating method for wastewater treatment using a zoned internal circulating sequencing batch reactor, comprising the following steps:

[0033] Step S1: Sludge inoculation. Activated sludge is inoculated into reaction zone I1 and reaction zone II2 until the concentration of activated sludge reaches 2000-4000 mg / L. Then, biofilm carrier 12 is added to reaction zone I1 to make the biofilm carrier 12 filling rate reach 15-30%.

[0034] Step S2: Set the operating cycle, which is divided into the water inlet stage, anaerobic stage, anoxic / aerobic alternation stage, sedimentation and drainage stage, and idle stage.

[0035] Step S3: During the water intake stage, simultaneously open the inlet pipe 11 of reaction zone I, the inlet pipe 21 of reaction zone II, the internal circulation outlet pipe 14, and the internal circulation inlet pipe 27 to allow sewage to enter reaction zone I1 and reaction zone II2, and maintain the liquid levels in reaction zone I1 and reaction zone II2 at the same level until the water intake stage reaches the set liquid level, then close the inlet pipe 11 of reaction zone I and the inlet pipe 21 of reaction zone II.

[0036] Step S4: During the anaerobic stage, turn on the stirring device 13 in reaction zone I, the stirring device 23 in reaction zone II, and the internal circulation pump 15. Adjust the internal circulation flow rate and control the ratio of the volume of reaction zone I1 to the internal circulation flow rate to be 20-60 min. At this time, the entire reaction device enters the anaerobic reaction stage. Polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria absorb organic matter in the wastewater and convert it into intracellular carbon sources. Polyphosphate-accumulating bacteria complete anaerobic phosphorus release until the anaerobic stage reaches the set duration of 2-4 hours.

[0037] Step S5: After the anaerobic stage duration is reached, the anoxic / aerobic alternating stage begins. At this time, the stirring equipment 23 in reaction zone II is turned off, and the air compressor 24 is turned on, so that the entire reaction device enters the anoxic / aerobic alternating reaction stage. In this stage, reaction zone I1 operates under anoxic conditions, and reaction zone II2 operates under aerobic conditions. An internal circulation environment is formed through the internal circulation pump 15, so that the sludge mixture in reaction zone I1 and reaction zone II2 is in anoxic / aerobic alternating environmental conditions, inhibiting the activity of nitrite oxidizing bacteria. At the same time, reaction zone I1 enriches anaerobic ammonia oxidizing bacteria through the biofilm carrier 12. In this reaction stage, nitrogen in the water is removed through multiple pathways such as short-cut nitrification / internal carbon source denitrification, short-cut nitrification / anaerobic ammonia oxidation, and nitrification / internal carbon source short-cut denitrification / anaerobic ammonia oxidation. Meanwhile, polyphosphate-accumulating bacteria complete the phosphorus uptake reaction under aerobic and anoxic conditions, achieving simultaneous and efficient removal of nitrogen and phosphorus until the anoxic / aerobic alternating stage reaches the set duration of 4-6 hours.

[0038] Step S6: After the simultaneous removal of nitrogen and phosphorus, the sedimentation and drainage stage is reached. At this time, the stirring equipment 13, internal circulation pump 15 and air compressor 24 in reaction zone I are turned off, so that the entire reaction device enters the sedimentation stage. After 0.5 to 1 hour, the water outlet pipe 16 of reaction zone I and the water outlet pipe 26 of reaction zone II are turned on to drain the supernatant. After 0.5 to 1 hour, the water outlet pipe 16 of reaction zone I and the water outlet pipe 26 of reaction zone II are turned off, so that the entire reaction device enters the idle stage.

[0039] Step S7: After the entire reaction device enters an idle period of 0.5 to 1 hour, the next wastewater treatment operation command will be issued.

[0040] Example 2

[0041] This invention provides an embodiment of wastewater treatment using a zoned, circulating sequential batch reactor, comprising the following steps:

[0042] Step S1: Sludge inoculation. Activated sludge is inoculated into reaction zone I1 and reaction zone II2 until the concentration of activated sludge reaches 3000 mg / L. Then, biofilm carrier 12 is added to reaction zone I1 to make the biofilm carrier 12 filling rate reach 20%.

[0043] Step S2: Set the operating cycle, which is divided into the water inlet stage, anaerobic stage, anoxic / aerobic alternation stage, sedimentation and drainage stage, and idle stage.

[0044] Step S3: The water inlet stage is set to 0.5h. During the water inlet stage, the inlet pipe 11 of reaction zone I, the inlet pipe 21 of reaction zone II, the internal circulation outlet pipe 14, and the internal circulation inlet pipe 27 are opened simultaneously to allow sewage to enter reaction zone I1 and reaction zone II2. The liquid levels in reaction zone I1 and reaction zone II2 are kept equal until the liquid injection cycle reaches the set liquid level. Then, the inlet pipe 11 of reaction zone I and the inlet pipe 21 of reaction zone II are closed.

[0045] Step S4: Set the anaerobic stage to 2 hours. After the influent stage ends, the anaerobic stage begins. Turn on the stirring device 13 in reaction zone I, the stirring device 23 in reaction zone II, and the internal circulation pump 15. Adjust the internal circulation flow rate and control the ratio of the volume of reaction zone I1 to the internal circulation flow rate to 20 minutes. At this time, the entire reaction device enters the anaerobic reaction stage. Microorganisms such as polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria absorb organic matter in the sewage and convert it into intracellular carbon sources. Polyphosphate-accumulating bacteria complete anaerobic phosphorus release until the anaerobic stage reaches the set duration of 2 hours.

[0046] Step S5: After the anaerobic stage, the reaction enters the anoxic / aerobic alternating stage, with a reaction cycle of 4 hours. At this time, the stirring equipment in reaction zone II is turned off, and the air compressor 24 is turned on. Under this state, the stirring equipment 13 in reaction zone I and the internal circulation pump 15 are kept on, so that the entire reaction device enters the anoxic / aerobic alternating reaction stage. In this stage, reaction zone I1 operates under anoxic conditions, and reaction zone II2 operates under aerobic conditions (wherein, the dissolved oxygen concentration in reaction zone II2 is 0.5-2 mg / L). Through internal circulation, the sludge mixture is kept in anoxic / aerobic alternating environmental conditions to inhibit the activity of nitrite oxidizing bacteria. At the same time, the anaerobic ammonia oxidizing bacteria are enriched in reaction zone I through the biofilm carrier. In this reaction stage, nitrogen in the water is removed through multiple pathways such as short-cut nitrification / internal carbon source denitrification, short-cut nitrification / anaerobic ammonia oxidation, and nitrification / internal carbon source short-cut denitrification / anaerobic ammonia oxidation. Meanwhile, polyphosphate-accumulating bacteria complete the phosphorus uptake reaction under aerobic and anoxic conditions, achieving simultaneous and efficient removal of nitrogen and phosphorus.

[0047] After step S6, the anoxic / aerobic alternation stage ends, the sedimentation and drainage cycle begins. At this time, the stirring equipment 13, internal circulation pump 15, and air compressor 24 in reaction zone I are turned off, so that the entire reaction device enters the sedimentation stage. After 0.5 hours, the outlet pipe 16 of reaction zone I and the outlet pipe 26 of reaction zone II are opened to drain the supernatant. After 0.5 hours, the outlet pipe 16 of reaction zone I and the outlet pipe 26 of reaction zone II are turned off, so that the entire reaction device enters the idle stage.

[0048] Step S7: After the entire reaction device enters an idle period of 0.5 hours, the next wastewater treatment operation command will be issued.

[0049] In this embodiment, the above-described implementation method was used to conduct a wastewater treatment experiment. The following are the setup conditions for this implementation method: The experiment used laboratory-synthesized wastewater as the raw water, with the following specific water quality: COD concentration of 150-250 mg / L, NH4+ concentration of... + -N concentration is 30-50 mg / L, NO2 - -N concentration is 0–0.5 mg / L, NO3 - -N concentration was 0–2 mg / L, TN concentration was 30–60 mg / L, and TP concentration was 3–8 mg / L. The experimental apparatus was made of plexiglass. The effective volume of the selected zone-based circulating batch reactor was 6 L. The effective volumes of each zone were: reaction zone I1 3 L, reaction zone II 3 L, and the internal circulation flow rate was kept constant at 9 L / h during the experiment.

[0050] The experimental results are shown in the following chart:

[0051]

[0052] As can be seen from the above charts, the wastewater quality treated in this embodiment is significantly better than the existing Class A discharge standard of wastewater treatment plants, achieving a significant improvement in treatment effect.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for sewage treatment based on a partitioned internal circulation sequencing batch reactor device, characterized in that: The method comprises the following steps: Step S1, setting a reaction zone I (1) and a reaction zone II (2) in a reaction device, inoculating activated sludge in the reaction zone I (1) and adding a biofilm carrier (12) for enriching anaerobic ammonia oxidation bacteria, only inoculating activated sludge in the reaction zone II (2), and setting a reaction zone I water inlet pipe (11), a reaction zone I stirring device (13), an internal circulation water outlet pipe (14), an internal circulation pump (15) and a reaction zone I water outlet pipe (16) in the reaction zone I (1); wherein the reaction zone II (2) is provided with a reaction zone II water inlet pipe (21), an aeration disc (22), a reaction zone II stirring device (23), an air compressor (24), a gas amount adjusting valve (25), a reaction zone II water outlet pipe (26) and an internal circulation water inlet pipe (27); Step S2, sludge inoculation, inoculating activated sludge in the reaction zone I (1) and the reaction zone II (2) until the concentration of the activated sludge reaches 2000-4000 mg / L, and then adding the biofilm carrier (12) in the reaction zone I (1) to make the filling rate of the biofilm carrier (12) reach 15-30%; Step S3, setting an operation cycle, which is divided into a water inlet stage, an anaerobic stage, an anoxic / aerobic alternating stage, a sedimentation and drainage stage and an idle stage; Step S4, in the water inlet stage, simultaneously opening the reaction zone I water inlet pipe (11), the reaction zone II water inlet pipe (21), the internal circulation water outlet pipe (14) and the internal circulation water inlet pipe (27) to make the wastewater enter the reaction zone I (1) and the reaction zone II (2) and maintain the liquid levels of the reaction zone I (1) and the reaction zone II (2) to be flat, and then closing the reaction zone I water inlet pipe (11) and the reaction zone II water inlet pipe (21) after the water inlet reaches a set liquid level; Step S5, in the anaerobic stage, opening the reaction zone I stirring device (13), the reaction zone II stirring device (23) and the internal circulation pump (15), adjusting the internal circulation flow rate, and controlling the ratio of the volume of the reaction zone I (1) to the internal circulation flow rate to be 20-60 min, at this time, the whole reaction device enters the anaerobic reaction stage, the phosphorus accumulating bacteria and the glycogen accumulating bacteria absorb the organic matter in the wastewater and convert it into intracellular carbon sources, the phosphorus accumulating bacteria complete anaerobic phosphorus release, and the time length reaches a set time length of 2-4 h; Step S6, when the length of the anaerobic stage reaches, enter the anoxic / aerobic alternating stage, at this time, close the stirring device (23) of the reaction zone II, open the air compressor (24), make the whole reaction device enter the anoxic / aerobic alternating reaction stage, at this stage, the reaction zone I (1) is operated under anoxic condition, the reaction zone II (2) is operated under aerobic condition, through the internal circulation pump (15), form the internal circulation environment, make the internal sludge mixed liquid of the reaction zone I (1) and the reaction zone II (2) be in the anoxic / aerobic alternating environmental condition, inhibit the activity of nitrite oxidizing bacteria, at the same time, the reaction zone I (1) enriches anaerobic ammonia oxidation bacteria through the biological membrane carrier (12), this reaction stage removes nitrogen in water through the way of short-cut nitrification / inner carbon source denitrification, short-cut nitrification / anaerobic ammonia oxidation and nitrification / inner carbon source short-cut denitrification / anaerobic ammonia oxidation, at the same time, the phosphorus-accumulating organisms complete the phosphorus absorption reaction under aerobic and anoxic conditions, realize the synchronous and efficient removal of nitrogen and phosphorus, until the length reaches the set length 4-6h; Step S7, after the synchronous removal of nitrogen and phosphorus, enter the sedimentation and drainage stage, at this time, close the stirring device (13) of the reaction zone I, the internal circulation pump (15) and the air compressor (24), make the whole reaction device enter the sedimentation stage, after 0.5-1h, open the effluent pipe (16) of the reaction zone I and the effluent pipe (26) of the reaction zone II, discharge the supernatant, and close the effluent pipe (16) of the reaction zone I and the effluent pipe (26) of the reaction zone II after 0.5-1h, make the whole reaction device enter the idle stage; Step S7, after the whole reaction device enters the idle stage for 0.5-1h, carry out the next sewage treatment operation instruction.

2. The wastewater treatment method based on the partitioned internal circulation sequencing batch reactor device according to claim 1, characterized in that: The reaction zone I (1) and the reaction zone II (2) are provided with a partition plate (3) in the middle, the upper part of the partition plate (3) is provided with an internal circulation water hole (31) with a screen, the internal circulation water hole (31) with a screen is used for the circulation flow of the sludge-water mixture, and the biological membrane carrier is intercepted in the reaction zone I.

3. The wastewater treatment method based on the zone internal circulation sequencing batch reactor device according to claim 2, characterized in that: The reaction zone I water inlet pipe (11) is fixedly installed on the upper part of the outer wall of the reaction zone I (1), the reaction zone I effluent pipe (16) is fixedly installed on the middle part of the outer wall of the reaction zone I (1), the internal circulation effluent pipe (14) is fixedly installed on the bottom of the reaction zone I (1), and the internal circulation effluent pipe (14) is connected with the water inlet end of the internal circulation pump (15), the reaction zone I stirring device (13) is arranged in the middle part of the reaction zone I (1), and the partition plate (3) is arranged between the reaction zone I (1) and the reaction zone II (2).

4. The wastewater treatment method based on the zone internal circulation sequencing batch reactor device according to claim 1, characterized in that: The reaction zone I water inlet pipe (11) and the reaction zone II water inlet pipe (21) are used for guiding the sewage into the reaction zone I (1) and the reaction zone II (2) respectively, and the reaction zone I effluent pipe (16) and the reaction zone II effluent pipe (26) are used for discharging the treated sewage from the reaction zone I (1) and the reaction zone II (2) respectively.

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