Method for realizing long-acting stable short-cut nitrification and denitrification phosphorus removal based on sludge sidestream treatment

Abstract

The invention discloses a method for realizing long-acting stable shortcut nitrification and denitrification phosphorus removal based on sludge sidestream treatment, and belongs to the field of biological sewage treatment. After the short-cut nitrification process, the denitrification process, the phosphorus removal process and the carbon removal process of sewage in the reactor are completed, activated sludge is divided into three directions, one part of the activated sludge is discharged to maintain the sludge age, the other part of the activated sludge continues to be subjected to the nitrogen and phosphorus removal process in the reactor, and a small part of the sludge with excellent denitrification and phosphorus removal performance is reserved to flow back to an independent storage pool. In the later period of operation, after the cell activity in the activated sludge is damaged due to accumulation of high-concentration nitrite nitrogen, the activated sludge retained in the early stage flows back to the reactor, so that the denitrifying phosphorus removal performance of the sludge is enhanced, and efficient and stable nitrogen and phosphorus removal is realized. The method realizes synchronous deep removal of nitrogen and phosphorus in sewage, is suitable for automatic operation, and is convenient for realizing accurate control and optimal management of the process.

Description

Technical Field

[0001] The invention belongs to the field of biological sewage treatment, relates to biological nitrogen removal and phosphorus removal in municipal sewage, and specifically relates to a method for realizing long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment. Background Art

[0002] With the rapid development of my country's economy and the improvement of people's living standards, a large amount of nitrogen and phosphorus emissions from domestic sewage, industrial wastewater and agricultural non-point source pollution have led to water pollution, which in turn caused problems such as lake blooms and offshore red tides, threatening the aquatic ecosystem.

[0003] At present, most sewage treatment plants use the A2 / O process to treat urban sewage through full nitrification and denitrification. However, in order to ensure that the effluent meets the standards, a large amount of aeration and carbon source are required, which leads to a significant increase in operating costs. In addition, although the total nitrogen content of the sewage after secondary treatment meets the standards, the removal of phosphorus often requires chemical methods, which further increases the cost. Coupled with increasingly stringent emission standards, deep denitrification and phosphorus removal has also become a major problem. Traditional biological denitrification and phosphorus removal processes have problems such as slow proliferation of nitrifying bacteria, long hydraulic retention time, and low treatment efficiency. Especially for urban sewage with low C / N, external carbon sources need to be added, which increases infrastructure and operating costs. Therefore, the development of efficient and energy-saving denitrification and phosphorus removal processes is of great significance to the field of sewage treatment.

[0004] The application of traditional full-process nitrification and denitrification denitrification processes in municipal sewage treatment faces challenges. Although these traditional processes are effective, they have problems such as high energy consumption, large sludge production and high greenhouse gas emissions. In recent years, new technologies such as denitrification phosphorus removal and short-term nitrification and denitrification have gradually attracted widespread attention. These new technologies have shown great potential in reducing energy consumption, reducing sludge and greenhouse gas production. In particular, the short-term nitrification coupled denitrification phosphorus removal technology significantly saves aeration energy and organic carbon sources by more effectively utilizing carbon and nitrogen sources in urban sewage, while reducing sludge production. Therefore, this technology is considered to be a very promising biological denitrification technology for achieving deep treatment of low carbon-nitrogen ratio sewage. The short-term nitrification coupled denitrification phosphorus removal process not only improves the efficiency of sewage treatment, but also effectively reduces energy consumption and sludge production in the treatment process, which is in line with the sustainable development goals of modern sewage treatment. However, the accumulation of nitrite nitrogen produced during the short-term nitrification process is prone to toxic effects on microorganisms, resulting in the phenomenon of "dissolving phosphorus", which leads to the deterioration of phosphorus removal effect. Therefore, the cytotoxic effect caused by the accumulation of high concentrations of nitrite nitrogen is a bottleneck problem that needs to be urgently solved to achieve stable and efficient operation of the short-term nitrification and denitrification phosphorus removal process. Summary of the invention

[0005] In order to solve the problem that high-concentration nitrite nitrogen accumulated in short-term nitrification in current sewage treatment inhibits the phosphorus absorption capacity of sludge, resulting in substandard effluent phosphorus, the present invention proposes a method for achieving long-term stable short-term nitrification and denitrification phosphorus removal based on sludge side stream treatment, thereby achieving stable and efficient denitrification and dephosphorization of sewage.

[0006] A method for achieving long-term stable short-term nitrification and denitrification phosphorus removal based on sludge side stream treatment. The specific process is as follows:

[0007] Phase I: Construction of a short-range nitrification and denitrification phosphorus removal system based on sludge side stream treatment;

[0008] The main body of the short-range nitrification, denitrification and phosphorus removal system is a reactor, the water inlet valve of the reactor is connected to the water inlet peristaltic pump, and the sewage is input into the reactor through the water inlet peristaltic pump; the drainage valve on the side of the reactor and the mud discharge valve at the bottom are respectively connected to the drainage peristaltic pump and the mud discharge peristaltic pump, and the treated sewage is discharged into the drainage tank through the drainage peristaltic pump, and the treated sludge is discharged into the mud discharge tank and the mud storage tank respectively through the mud discharge peristaltic pump; an aeration head is installed at the bottom of the reactor, and oxygen is transported to the aeration head through the air inlet valve and then released into the reactor; a stirrer is installed on the top of the reactor, and a stirring paddle extends into the sewage;

[0009] Furthermore, the DO and pH values ​​of the wastewater in the reactor were monitored by a DO sensor and a pH sensor.

[0010] Phase 2: System startup phase;

[0011] Step 201, pumping sewage into the main reactor through the water inlet peristaltic pump, so that the MLSS (mixed liquor suspended solids) of the activated sludge in the reactor is 3000-3500 mg / L.

[0012] Step 202, in an anaerobic-aerobic operation mode, the sewage in the reactor is domesticated into sludge for phosphorus removal using oxygen as an electron acceptor, specifically:

[0013] Anaerobic stirring was performed for 120 min while water was being introduced, and then the reactor was aerated aerobically for 300 min, and finally settled for 30 min, and drained for 10 min, with a drainage ratio of 50%, and then left idle for 20 min after drainage;

[0014] Under anaerobic stirring conditions, polyphosphate bacteria (PAOs and DPAOs), polyglycogenotrophic bacteria (GAOs) and denitrifying polyglycogenotrophic bacteria (DGAOs) absorb organic carbon sources in sewage and synthesize internal carbon sources PHA (PolyHydroxyAlkanoates) and store them in their bodies. At the same time, polyphosphate bacteria will release phosphate particles in their bodies into the water under anaerobic conditions.

[0015] During aerobic aeration, the dissolved oxygen in the reactor was controlled at 2.0 ± 0.3 mg / L by a gas rotor flowmeter;

[0016] Step 203, running three cycles per day in an anaerobic-aerobic mode, when the index reaches the requirement and is maintained stably for 15 days, it indicates that the enrichment and domestication of polyphosphate bacteria using oxygen as an electron acceptor is completed, and the next stage is entered;

[0017] The indicators include: NH4 in the reactor outlet water + -N is 2-4mg / L, NO3 - -N is 0-0.5mg / L, NO2 - -N is 0-0.5mg / L, PO4 3- -P is 0-0.5mg / L.

[0018] The third stage: sewage stabilization treatment stage;

[0019] Step 301, domesticating the short-cut nitrification and denitrification phosphorus removal sludge in an anaerobic-anoxic-aerobic operation mode, specifically as follows:

[0020] The sewage enters the reactor through the water inlet peristaltic pump, and is anaerobically stirred for 120 minutes while the water is entering; then it is anaerobically stirred for 180 minutes, and at the beginning of anoxic period, the required sodium nitrite dosage is calculated according to the effective volume of the reactor in the reactor, and the prepared 100 mg / L high-concentration sodium nitrite solution is added to simulate the accumulation of nitrite nitrogen in the sewage in the reactor to be 10 mg / L, and the sludge is acclimated to denitrify and remove phosphorus with nitrite as the electron acceptor; aerobic aeration is carried out for 120 minutes, and the dissolved oxygen in the reactor is controlled at 2 mg / L; then it is precipitated for 30 minutes, drained for 10 minutes, and the drainage ratio is 50%. It is idle for 20 minutes after drainage, and runs three cycles a day.

[0021] Step 302, when the system indicators meet the requirements and remain stable, the sludge in the reactor is discharged into the sludge discharge box, the MLSS of the sludge in the reactor is maintained at 3500±200mg / L, and at the same time, 20% of the sludge in the effective volume of the reactor is discharged into the sludge storage box for standby use, and the sludge age in the reactor is controlled at 20 to 25 days.

[0022] The indicators are: NH4 in the system outlet water + -N concentration is lower than 5mg / L, nitrite nitrogen accumulation rate reaches more than 80%, total nitrogen removal rate reaches more than 50%, and total phosphorus removal rate reaches more than 80%.

[0023] The fourth stage: Eliminate the toxicity of nitrite nitrogen accumulation based on sidestream treatment;

[0024] Sewage enters the reactor through the water inlet peristaltic pump, and anaerobic stirring begins at the same time as water inlet, and anaerobic stirring lasts for 120 minutes; before anoxic stirring, the reactor is added with a 100 mg / L high-concentration sodium nitrite solution according to the amount of sodium nitrite required for the effective volume of the reactor, simulating short-range nitrification to produce high-concentration nitrite nitrogen accumulation, so that the nitrite nitrogen accumulation in the anoxic reactor is maintained at 25 mg / L. Anoxic stirring lasts for 180 minutes, aerobic aeration lasts for 120 minutes, and the dissolved oxygen in the reactor is controlled at 2.0 mg / L by a gas rotor flowmeter; then sedimentation lasts for 30 minutes, drainage lasts for 10 minutes, and the drainage ratio is 50%. After drainage, it is idle for 20 minutes, and the next cycle begins, and anaerobic stirring of water inlet, anoxic stirring, aerobic aeration, sedimentation drainage and idleness are continued, and three cycles are operated every day.

[0025] After 60 days of operation, observe the effluent quality. If PO4 3- -P was higher than 2 mg / L for 7 consecutive days, indicating that the activated sludge had been subjected to toxic stress of nitrite nitrogen. At this time, the sludge in the sludge storage tank was added to the reactor at a ratio of 20% of the effective volume of the reactor and the operation was continued. After a period of time, the phosphorus removal rate recovered to more than 80%.

[0026] The present invention has the following advantages:

[0027] 1) Easy-to-operate SBR reactor: The present invention adopts a sequencing batch reactor (SBR), which has the characteristics of easy operation, stable operation, and excellent precipitation effect. It is suitable for automated operation and is easy to achieve precise control and optimized management of the process.

[0028] 2) Innovative denitrification and phosphorus removal technology: The present invention introduces denitrification and phosphorus removal technology into the short-range nitrification process, making full use of its advantage of "one carbon for two uses", effectively solving the problems of insufficient utilization of organic carbon sources, high nitrate nitrogen content in effluent, and inability to remove phosphorus, thereby achieving simultaneous deep removal of nitrogen and phosphorus in municipal sewage.

[0029] 3) Efficient functional bacteria reserve: Under good operating conditions, the stored activated sludge contains a large number of highly functional denitrification and phosphorus removal bacteria. These functional bacteria can effectively alleviate the toxic effects of high nitrite accumulation on activated sludge during the short-range nitrification process and maintain the efficient denitrification and phosphorus removal performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the device structure for achieving long-term short-range nitrification and denitrification phosphorus removal for sludge side treatment.

[0031] In the figure:

[0032] 1- urban sewage raw water, 2- short-range nitrification and denitrification sequencing batch reactor, 2.1- water inlet peristaltic pump, 2.2- water inlet valve, 2.3- SBR reactor, 2.4- agitator, 2.5- stirring paddle, 2.6- DO sensor, 2.7- pH sensor, 2.8- DO / pH meter, 2.9- drain valve, 2.10- mud valve, 2.11- aeration head, 2.12- gas flow meter, 2.13- air inlet valve, 2.14- air pump, 2.15- mud peristaltic pump, 3- mud box, 4- mud storage box; 5- drain tank. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] The present invention proposes a new process for stable short-term nitrification and denitrification and phosphorus removal by side stream sludge treatment. Short-term nitrification coupled with denitrification and phosphorus removal After the activated sludge completes the short-term nitrification process, denitrification process, phosphorus removal process and carbon removal process, the activated sludge is divided into three directions, one part is discharged to maintain the sludge age, the other part continues to carry out the denitrification and phosphorus removal process in the reactor, and a small part of the sludge with excellent denitrification and phosphorus removal performance is retained and returned to a separate storage tank. When the high concentration of nitrite nitrogen accumulates in the late stage of operation and causes the cell activity in the activated sludge to be damaged, this part of the activated sludge retained in the early stage is returned to the beginning of the biological pool, thereby enhancing the denitrification and phosphorus removal performance of the sludge and achieving efficient and stable denitrification and phosphorus removal.

[0035] The present invention provides a method for realizing long-term stable short-term nitrification and denitrification phosphorus removal by utilizing sludge side stream treatment. By adopting a short-term nitrification and denitrification phosphorus removal process, sludge with good short-term nitrification and denitrification phosphorus removal efficiency is retained, and sludge with deteriorated performance under high nitrite nitrogen stress is replenished in time, so as to achieve long-term stable and efficient short-term nitrification and denitrification phosphorus removal, which has the advantages of green economy and simple operation.

[0036] First, municipal sewage is pumped into the main reactor through a peristaltic pump. Under anaerobic stirring conditions, functional bacteria such as polyphosphate bacteria (PAOs and DPAOs), polyglycogenotrophic bacteria (GAOs) and denitrifying polyglycogenotrophic bacteria (DGAOs) will absorb the organic carbon source in the sewage and synthesize the internal carbon source PHA (PolyHydroxyAlkanoates) and store it in the body. At the same time, polyphosphate bacteria will release the phosphate particles in the body into the water under anaerobic conditions, and the organic matter in the municipal sewage will be stored as the internal carbon source.

[0037] Set up intermittent aeration, and use time-controlled aeration and stop to achieve synchronous short-range nitrification, denitrification and phosphorus removal. Nitrification occurs during aeration, and the environment is converted to anoxic when there is no aeration, so denitrification and phosphorus removal are carried out.

[0038] Finally, part of the sludge is discharged, part is stored in the sludge side device for standby use, and the remaining part undergoes the main reaction in the reactor.

[0039] The present invention does not require the addition of an external organic carbon source, and intermittent aeration can reduce the aeration volume. Synchronous deep denitrification and phosphorus removal can be achieved through synchronous short-range nitrification and denitrification phosphorus removal. The sludge side stream treatment can enhance the phosphorus removal effect and achieve stable denitrification and phosphorus removal in sewage.

[0040] like Figure 1 As shown, the device of the municipal sewage short-cut nitrification and denitrification phosphorus removal process comprises a municipal sewage raw water tank (1), a short-cut nitrification and denitrification phosphorus removal reactor (2), a sludge discharge tank (3), a sludge storage tank (4), and a drainage tank (5). The actual domestic sewage is connected to the short-range nitrification, denitrification and phosphorus removal reactor (2) through a water inlet peristaltic pump (2.1); the short-range nitrification, denitrification and phosphorus removal reactor (2) is provided with a water inlet valve (2.2), a reactor body (2.3), a stirrer (2.4) connected to a stirring paddle (2.5), a DO (Dissolved Oxygen) sensor (2.6), a pH sensor (2.7), a DO / pH meter (2.8), a drain valve (2.9), a mud discharge valve (2.10) and an aeration head (2.11) are arranged at the bottom, and the system is oxygenated by connecting the aeration head (2.11) through an air pump (2.14), and the aeration volume is adjusted and controlled by an air inlet valve (2.13) and a gas flow meter (2.12). The effluent of the short-range nitrification and denitrification phosphorus removal reactor (2) is discharged into the drainage tank (5) through the drainage peristaltic pump (2.16), and the sludge is discharged into the sludge discharge tank (3) and the sludge storage tank (4) through the sludge discharge peristaltic pump (2.15). The effective volume of the sludge storage tank (4) for sludge side treatment is 3L, and the effective volume of the reactor body (2.3) is 10L. The reactor is made of organic glass.

[0041] The specific operation is as follows:

[0042] ① Start-up phase of the short-cut nitrification and denitrification phosphorus removal system: The short-cut nitrification and denitrification phosphorus removal reactor SBR (2) is inoculated with flocculent sludge from the secondary sedimentation tank of an actual sewage treatment plant, and the sludge concentration is maintained at 3000-3500 mg / L.

[0043] The sludge is domesticated in an anaerobic-aerobic mode to remove phosphorus using oxygen as an electron acceptor. The domestic sewage is introduced through the water inlet peristaltic pump (2.1), and the anaerobic stirring is carried out for 120 minutes; the aeration is carried out for 300 minutes, and the dissolved oxygen in the reactor is controlled to be 2.0±0.3 mg / L through the gas rotor flowmeter (2.3), and the sedimentation is carried out for 30 minutes, and the drainage is carried out for 10 minutes, the drainage ratio is 50%, and the reactor is left idle for 20 minutes after drainage. Three cycles are run every day;

[0044] NH4 in the effluent from the SBR reactor (2) +-N is 2-4mg / L, NO3 - -N is 0-0.5mg / L, NO2 - -N is 0-0.5mg / L, PO4 3- -P is 0-0.5 mg / L. After the above indicators are achieved and maintained stably for 15 days, it means that the enrichment and domestication of polyphosphate bacteria using oxygen as electron acceptor is completed.

[0045] ② Then acclimate the short-range nitrification, denitrification and phosphorus removal sludge in the anaerobic-anoxic-aerobic operation mode. The sewage in the urban sewage raw water tank (1) enters the SBR reactor (2.3) through a peristaltic pump (2.1), and is anaerobically stirred for 120 minutes; anaerobically stirred for 180 minutes, and aerobic aeration for 120 minutes. The dissolved oxygen in the reactor is controlled at 2 mg / L through a gas rotor flowmeter (2.3); then it is precipitated for 30 minutes, drained for 10 minutes, and the drainage ratio is 50%. After drainage, it is idle for 20 minutes, and three cycles are operated every day. When the SBR reactor (2) is in operation, part of the activated sludge is discharged into the sludge box through the sludge pump to maintain the floc sludge concentration in the reactor at 3500±200 mg / L. When the operating conditions are good, a small amount of sludge is discharged into the sludge storage box (4) for standby use, and the sludge age is controlled at 20 to 25 days. When the NH4 + -N concentration is lower than 5 mg / L, nitrite accumulation rate reaches more than 80%, total nitrogen removal rate reaches more than 50%, total phosphorus removal rate reaches more than 80%, and the startup of the short-range nitrification and denitrification phosphorus removal reactor (2) is completed.

[0046] ③ Short-term nitrification and denitrification phosphorus removal stabilization stage: by adding nitrite nitrogen in the anoxic stage, the accumulation of nitrite nitrogen in the anoxic stage is maintained at about 10 mg / L, the growth of bacteria that use nitrite nitrogen as an electron acceptor for denitrification and phosphorus accumulation is enhanced, and the nitrite nitrogen type denitrification and phosphorus accumulation bacteria are gradually domesticated and enriched. The SRT (Sludge Retention Time, sludge age) is controlled at 20 to 30 days. This stage lasts for 60 days, and about 5% of the effective volume of the reactor is discharged into the sludge storage tank (4) every 7 days through the sludge discharge peristaltic pump (2.15). Gradually increase the nitrite nitrogen load in the anoxic stage so that the accumulation of nitrite nitrogen in the anoxic stage is maintained at about 25 mg / L to test the performance of the sludge under high nitrite nitrogen stress and the effect of sludge side phosphorus removal. At this time, sludge is no longer collected. After running for about 60 days, when the total phosphorus removal rate of the system is lower than 50%, all the sludge in the sludge storage tank is returned to the short-range nitrification and denitrification phosphorus removal reactor (2.1), and the nitrite nitrogen concentration in the anoxic period is reduced to 10 mg / L. After running for a period of time, if the total phosphorus removal rate is restored to more than 80%, it can be considered that the method of maintaining long-term and efficient short-range nitrification and denitrification phosphorus removal by sludge side phosphorus removal has been successfully started.

[0047] After the reactor is successfully started, the influent is actual domestic sewage, and the NH4+ -N concentration is 50-60mg / L, NO2 - -N and NO3 - -N concentration is less than 1mg / L, COD (Chemical Oxygen Demand) is about 200-300mg / L, and total phosphorus concentration is about 3-8mg / L. The data of domestic sewage treatment after the reactor is running stably shows that the total nitrogen in the effluent is less than 10mg / L, including NH4 + -N concentration is less than 4mg / L, NO2 - -N concentration is less than 1mg / L, NO3 - -N concentration is less than 5mg / L, COD removal rate is about 75-85%, and total phosphorus concentration is less than 1mg / L, which can meet the Class A standard.

Claims

1. A method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment, characterized in that: The specific implementation process is as follows: Phase I: Construction of a short-range nitrification and denitrification phosphorus removal system based on sludge side stream treatment; The main body of the short-range nitrification, denitrification and phosphorus removal system is a reactor, the water inlet valve of the reactor is connected to the water inlet peristaltic pump, and the sewage is input into the reactor through the water inlet peristaltic pump; the drainage valve on the side of the reactor and the mud discharge valve at the bottom are respectively connected to the drainage peristaltic pump and the mud discharge peristaltic pump, and the treated sewage is discharged into the drainage tank through the drainage peristaltic pump, and the treated sludge is discharged into the mud discharge tank and the mud storage tank respectively through the mud discharge peristaltic pump; an aeration head is installed at the bottom of the reactor, and oxygen is transported to the aeration head through the air inlet valve and then released into the reactor; a stirrer is installed on the top of the reactor, and a stirring paddle extends into the sewage; The second stage: system startup stage; Step 201, pumping sewage into the main reactor through the water inlet peristaltic pump, so that the MLSS of the activated sludge in the reactor is 3000-3500 mg / L; Step 202, domesticating the sewage in the reactor into sludge for phosphorus removal using oxygen as an electron acceptor in an anaerobic-aerobic operation mode; Step 203, running three cycles per day in an anaerobic-aerobic mode, when the index reaches the requirement and is maintained stably for 15 days, it indicates that the enrichment and domestication of polyphosphate bacteria using oxygen as an electron acceptor is completed, and the next stage is entered; The third stage: sewage stabilization treatment stage; Step 301, domesticating the short-range nitrification and denitrification phosphorus removal sludge in an anaerobic-anoxic-aerobic operation mode, and calculating the required sodium nitrite dosage in the reactor according to the effective volume of the reactor at the initial stage of anoxic stirring, adding the prepared 100 mg / L high-concentration sodium nitrite solution, simulating the accumulation of nitrite nitrogen in the sewage in the reactor to be 10 mg / L, domesticating the sludge for denitrification and phosphorus removal using nitrite as an electron acceptor, and operating three cycles per day; Step 302, when the system index reaches the requirement and remains stable, the sludge in the reactor is discharged into the sludge discharge box, the MLSS of the sludge in the reactor is maintained at 3500±200mg / L, and 20% of the sludge in the effective volume of the reactor is discharged into the sludge storage box for standby use, and the sludge age in the reactor is controlled at 20-25 days; Phase 4: Detoxification of nitrite nitrogen accumulation based on lateral flow treatment; The reactor was maintained in an anaerobic-anoxic-aerobic operation mode for sewage treatment, and before the anoxic stirring, a 100 mg / L high-concentration sodium nitrite solution was added to the reactor according to the amount of sodium nitrite required for the effective volume of the reactor to simulate short-range nitrification to produce high-concentration nitrite nitrogen accumulation, so that the nitrite nitrogen accumulation in the anoxic reactor was maintained at 25 mg / L, and three cycles were operated per day; After 60 days of operation, observe the effluent quality. If PO4 3- -P is higher than 2 mg / L for 7 consecutive days, indicating that the activated sludge has been subjected to toxic stress of nitrite nitrogen. At this time, the sludge in the sludge storage tank is added to the reactor at a ratio of 20% of the effective volume of the reactor and the operation continues.

2. According to claim 1, a method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment, characterized in that: The short-cut nitrification and denitrification phosphorus removal system monitors the DO and pH values ​​of the sewage in the reactor through a DO sensor and a pH sensor.

3. According to claim 1, a method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment, characterized in that: The anaerobic-aerobic operation mode is specifically as follows: while water is being introduced, anaerobic stirring is performed for 120 minutes, then the reactor is aerated aerobically for 300 minutes, finally sedimentation is performed for 30 minutes, drainage is performed for 10 minutes, the drainage ratio is 50%, and after drainage, it is left idle for 20 minutes.

4. According to claim 1, a method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment, characterized in that: The specific operation mode of the anaerobic-anoxic-aerobic system is: while water is entering, anaerobic stirring is performed for 120 minutes, followed by anoxic stirring for 180 minutes, and aerobic aeration is performed for 120 minutes; then, sedimentation is performed for 30 minutes, drainage is performed for 10 minutes, the drainage ratio is 50%, and the system is left idle for 20 minutes after drainage.

5. A method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment according to claim 3 or 4, characterized in that: Under anaerobic stirring conditions, functional bacteria absorb organic carbon sources in sewage and synthesize internal carbon source PHA and store it in the body. At the same time, polyphosphate bacteria will release phosphate particles in the body into the water under anaerobic conditions.

6. A method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment according to claim 5, characterized in that: The functional bacteria include phosphate accumulating bacteria PAOs and DPAOs, glycogen accumulating bacteria GAOs and denitrifying glycogen accumulating bacteria DGAOs.

7. According to claim 1, a method for achieving long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment, characterized in that: During aerobic aeration, the dissolved oxygen in the reactor was controlled at 2.0±0.3 mg / L by a gas rotor flowmeter.

8. The method for realizing long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment according to claim 1, characterized in that: The indicators in step 203 include: NH4 in the reactor outlet water + -N is 2-4mg / L, NO3 - -N is 0-0.5mg / L, NO2 - -N is 0-0.5mg / L, PO4 3- -P is 0-0.5mg / L.

9. The method for realizing long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment according to claim 1, characterized in that: The indicator in step 302 is: NH4 + -N concentration is lower than 5mg / L, nitrite nitrogen accumulation rate reaches more than 80%, total nitrogen removal rate reaches more than 50%, and total phosphorus removal rate reaches more than 80%.

10. The method for realizing long-term stable short-range nitrification and denitrification phosphorus removal based on sludge side stream treatment according to claim 1, characterized in that: The side stream treatment eliminates the toxicity of nitrite nitrogen accumulation, ensures the activity of sludge in the reactor, and keeps the phosphorus removal rate of the short-range nitrification and denitrification phosphorus removal system above 80%.

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