Decentralized sewage treatment adjustable self-circulating activated sludge device and process

Abstract

The present application relates to a decentralized sewage treatment adjustable self-circulating activated sludge device and a process thereof, a decentralized sewage treatment adjustable self-circulating activated sludge device, comprising a regulating tank, an SBR reaction tank and a PLC control cabinet; a liquid level gauge for detecting sewage depth is installed in the regulating tank, and an inlet pipe and an inlet pump are connected between the regulating tank and the SBR reaction tank; an aeration system is provided in the SBR reaction tank, and the SBR reaction tank is connected to a water outlet pipe and a bottom suction pump; the PLC control cabinet is connected to the liquid level gauge, the inlet pump, the aeration system and the bottom suction pump, and the present application discloses that when the sewage in the regulating tank is between a low liquid level and a middle liquid level, the PLC control cabinet controls the inlet pump and the bottom suction pump to not start at the same time, and the SBR reaction tank can work normally. When the sewage in the regulating tank is between a middle liquid level and a high liquid level, the PLC control cabinet controls the inlet pump and the bottom suction pump to start at the same time, and the SBR reaction tank is synchronously inflowed and drained, thereby shortening the sewage treatment cycle of the SBR reaction tank.

Description

Technical Field

[0001] The present application relates to the field of sewage sludge treatment, and in particular to a decentralized sewage treatment adjustable self-circulating activated sludge device and process. Background Art

[0002] With the rapid development of my country's economy, the environmental pollution caused by rural sewage cannot be ignored. The characteristics of rural sewage water are large changes in water quality and quantity, and the sewage sources are scattered in residential areas.

[0003] SBR method is the abbreviation of Sequencing Batch Reactor Activated Sludge Process. The main structure is the SBR reaction tank, that is, water inlet, reaction, sedimentation, and drainage are carried out in the same reaction tank in sequence according to the time sequence. Compared with the common sewage sludge treatment equipment that requires multiple reaction tanks, the SBR method only needs one reaction tank to achieve the sewage treatment function of multiple reaction tanks, which makes the SBR equipment have the advantages of flexible operation, low investment, and simple and easy operation. It is suitable for treating rural sewage with large changes in water supply.

[0004] Rural sewage discharge is often more concentrated during the day, and at night, the discharge of rural sewage will decrease, and the meal time during the day is the time when the drainage volume increases. When the SBR reaction tank treats sewage, it needs to wait until the original sewage in the reaction tank is drained before introducing new sewage for treatment, resulting in the SBR reaction tank being in a state of intermittent drainage. Once the drainage volume is relatively concentrated, in order for the reaction tank to meet the sewage treatment needs during the period of concentrated drainage, the water inflow into the reaction tank will increase, so it is necessary to increase the capacity of the reaction tank, increase the construction cost of the reaction tank, and extend the time the reaction tank treats sewage. At the time when the drainage volume is not concentrated, the water inflow into the reaction tank will also decrease, and the volume utilization rate of the reaction tank is low, which is not conducive to saving the sewage treatment cost of the reaction tank. Summary of the Invention

[0005] In order to shorten the sewage treatment cycle of the SBR reaction tank and improve the volume utilization rate of the SBR reaction tank, the present application provides a decentralized sewage treatment adjustable self-circulating activated sludge device and process.

[0006] The present application provides a decentralized sewage treatment adjustable self-circulating activated sludge device and process using the following technical solutions:

[0007] First aspect

[0008] A decentralized sewage treatment adjustable self-circulating activated sludge device, comprising a regulating tank, an SBR reaction tank and a PLC control cabinet;

[0009] A liquid level gauge for detecting the depth of sewage is installed in the regulating tank, a water inlet pipeline is connected between the regulating tank and the SBR reaction tank, a water inlet pump connected to the water inlet pipeline is provided in the regulating tank, an aeration system is provided in the SBR reaction tank, and the SBR reaction tank is connected to a water outlet pipe, one end of the water outlet pipe located in the SBR reaction tank is connected to a bottom suction pump and the other end extends out of the SBR reaction tank;

[0010] The PLC control cabinet is connected to the liquid level gauge, the water inlet pump, the aeration system and the bottom suction pump. When the water inlet pump and the bottom suction pump are turned off, the aeration system is turned on, and the sewage in the SBR reaction tank begins to react and precipitate. When the original sewage in the SBR reaction tank is precipitated, the bottom suction pump is turned on, and the precipitated sewage in the SBR reaction tank is discharged from the SBR reaction tank. The water inlet pump is turned on, and the new sewage in the regulating tank is discharged into the SBR reaction tank.

[0011] When the sewage in the regulating tank is between the low liquid level and the middle liquid level, the PLC control cabinet controls the water inlet pump and the bottom suction pump to start at different times. When the sewage in the regulating tank is between the middle liquid level and the high liquid level, the PLC control cabinet controls the water inlet pump and the bottom suction pump to start at the same time, and the SBR reaction tank is synchronously filled with water and discharged.

[0012] By adopting the above technical solution, rural sewage is first concentrated in the regulating tank, and then pumped into the SBR reactor according to the water inlet pump to ensure that the sewage entering the SBR reactor is as stable as possible. When the sewage in the regulating tank is between the low and medium liquid levels, the PLC control cabinet controls the water inlet pump and the bottom suction pump to start at different times, allowing the SBR reactor to operate normally, extending the sewage treatment time and strengthening the denitrification and phosphorus removal of the sewage. When the sewage in the regulating tank is between the medium and high liquid levels, it means that the discharge of rural sewage has begun to increase. In order to enable the SBR reactor to treat more sewage at the same time, the PLC control cabinet controls the water inlet pump and the bottom suction pump to start simultaneously. When new sewage is introduced, the previously settled sewage in the SBR reactor can be partially pumped out by the bottom suction pump, providing space for the new sewage to react while also extending the time for the remaining sewage at the bottom of the reactor to react again, shortening the sewage treatment cycle of the SBR reactor and improving the volume utilization rate of the SBR reactor.

[0013] Optionally, the SBR reaction tank is divided into an inlet zone, a reaction zone and an outlet zone in sequence along its length direction, and the end of the inlet pipe facing away from the water pump is located in the inlet zone. The aeration device includes an aeration plate located at the bottom of the reaction zone of the SBR reaction tank and an aeration fan connected to the aeration plate. The bottom suction pump is located in the outlet zone of the SBR reaction tank and the bottom suction pump is located above the aeration plate.

[0014] By adopting the above technical solution, when new sewage enters the SBR reaction tank from the water inlet pipe, the sewage needs to pass through the reaction zone before it can diffuse to the outlet area. In the process of new sewage entering, the water level of the sewage that has settled in the SBR reaction tank will rise accordingly, so that the bottom suction pump can suck the settled sewage out of the SBR reaction tank, thereby extending the time for the new sewage to diffuse to the outlet area, and extending the time for the bottom suction pump to extract the settled sewage.

[0015] Optionally, a water distributor and a deflection baffle are provided in the water inlet area of ​​the SBR reaction tank, the water distributor is installed at the bottom of the SBR reaction tank, the water inlet pipe is connected to the water distributor, the deflection baffle is arranged vertically and located on the side of the water distributor facing the reaction area, the deflection baffle is located above the water distributor and is used to prevent the sewage discharged from the water distributor from splashing toward the reaction area.

[0016] By adopting the above technical solution, the new sewage is gradually diffused upward from the bottom of the SBR reaction tank through the distributor, thereby reducing the impact on the already settled sewage. Since the water distributor sprays the new sewage upward, the new sewage is in a state of spraying upward and in all directions. The baffle can intercept the new sewage spraying towards the reaction zone, thereby guiding the new sewage to enter the reaction zone only through the channel between the baffle and the bottom of the reaction tank, so that the new sewage diffuses from bottom to top in the reaction zone, further reducing the impact of the new sewage entering the SBR reaction tank on the already settled sewage in the SBR reaction tank.

[0017] Optionally, a water outlet pedestal is provided at the outlet area of ​​the SBR reaction tank, the water outlet pedestal is located above the aeration plate, the bottom suction pump is installed on the upper end surface of the water outlet pedestal, and an overflow pedestal is provided around the upper end surface of the water outlet pedestal for allowing the precipitated sewage to overflow to the bottom suction pump.

[0018] By adopting the above technical solution, the outlet support supports the bottom suction pump on the one hand, and prevents the bottom suction pump from directly pumping sewage downward on the other hand, thereby reducing the probability of settled sludge being pumped along with the sewage, so that the bottom suction pump can only pump the settled sewage located above the outlet support. The overflow support plate can guide the direction of the bottom suction pump's sewage extraction, so that the settled sewage flows from above the bottom suction pump to the bottom suction pump, thereby reducing the degree of oscillation caused by the settled sewage flowing within the SBR reactor. When the settled sewage is pumped by the bottom suction pump, the amount of settled sludge that moves along the flow direction of the sewage can be reduced, thereby improving the water quality of the sewage pumped by the bottom suction pump.

[0019] Optionally, an aeration shear plate for squeezing large bubbles generated by aeration in the reaction zone into small bubbles is provided under the water outlet support, and a slag baffle for blocking suspended solids in the reaction zone is provided on the side of the water outlet support facing the reaction zone.

[0020] By adopting this technical solution, when aeration begins in the SBR reactor, a large number of bubbles are generated in the sewage. The bubbles located below the outlet pedestal first contact the aeration shear plate, which squeezes the large bubbles into smaller ones, reducing the amount of sludge that falls onto the outlet pedestal. The slag plate prevents suspended solids in the reaction zone from drifting to the outlet, thereby improving the water quality of the sewage pumped by the bottom suction pump.

[0021] Optionally, an outlet overflow weir is provided above the bottom suction pump, one end of the outlet overflow weir is connected to the outlet pipe and the other side is connected to a sewage pipe and a sedimentation pipe, a dephosphorization dosing pump is provided on the top of the outlet overflow weir, one end of the sewage pipe connected to the outlet overflow weir is connected to the sewage pump, one end of the sedimentation pipe connected to the outlet overflow weir is connected to the sedimentation pump, and the other end of the sedimentation pipe is connected to a sedimentation component for mixing treatment of the sewage after adding the dephosphorization agent.

[0022] By adopting the above technical solution, when the sewage in the regulating tank is between the low and medium liquid levels, the water inlet pump and the bottom suction pump are not turned on at the same time, allowing the sewage in the SBR reaction tank to have sufficient time for denitrification and dephosphorization. When the water inlet pump and the bottom suction pump are turned on at the same time, the time the sewage stays in the SBR reaction tank is reduced, and the phosphorus removal time is shortened. When the bottom suction pump pumps the settled sewage into the effluent overflow weir, if the sewage TP at the effluent overflow weir meets the effluent standard, the sewage can be discharged directly from the sewage pipe. If the sewage TP at the effluent overflow weir does not meet the effluent standard, the sewage can enter the sedimentation component through the sedimentation pipe for further dephosphorization treatment until the sewage TP meets the standard.

[0023] Optionally, the phosphorus removal dosing pump, sewage pump and sedimentation pump are all connected to the PLC control cabinet; when the sewage TP at the outlet overflow weir meets the standard, the PLC control cabinet controls the sewage pump to start; when the sewage TP at the outlet overflow weir does not meet the standard, the PLC control cabinet controls the phosphorus removal dosing pump and the sedimentation pump to start, and according to the TP index, the PLC control cabinet controls the speed of the phosphorus removal dosing pump to adjust the dosage of the phosphorus removal agent entering the outlet overflow weir.

[0024] By adopting the above technical solution, when the sewage TP at the effluent overflow weir meets the standard, the PLC control cabinet controls the sewage pump to start; when the sewage TP at the effluent overflow weir does not meet the standard, the PLC control cabinet controls the phosphorus removal dosing pump and the sedimentation pump to start. The phosphorus removal dosing pump then releases the phosphorus removal agent into the effluent overflow weir. The sewage and phosphorus removal agent in the effluent overflow weir then enter the sedimentation assembly for reaction. The PLC control cabinet can timely adjust the flow rate of the phosphorus removal dosing pump based on the amount of sewage flowing into the effluent overflow weir, thereby flexibly adjusting the dosage of the phosphorus removal agent entering the effluent overflow weir, achieving effective phosphorus removal from the sewage while saving costs.

[0025] Optionally, the sedimentation assembly includes a sedimentation tank, a sedimentation inlet pipe, an inclined pipe and a phosphorus removal overflow weir;

[0026] The sedimentation tank is divided into a sedimentation zone and a fusion zone from top to bottom. One end of the sedimentation inlet pipe is connected to the sedimentation pipe and the other end extends into the fusion zone of the sedimentation tank. The inclined pipes are arranged obliquely upward and are provided in plurality. Multiple inclined rods are installed in the sedimentation zone of the sedimentation tank at horizontal intervals. The phosphorus removal overflow weir is installed at the top of the sedimentation zone of the sedimentation tank, and the phosphorus removal overflow weir is connected to the sewage pipe.

[0027] By adopting the above technical solution, the sewage and phosphorus removal agent located in the effluent overflow weir first enter the sedimentation inlet pipe, and are hydraulically mixed while flowing in the sedimentation inlet pipe, so that the sewage and phosphorus removal agent are more fully fused. The sewage mixed with the phosphorus removal agent flows into the sedimentation tank from the bottom of the sedimentation tank. Since sewage continues to enter the fusion zone of the sedimentation tank, the sewage is always in a state of flow and tumbling in the fusion zone, so that the phosphorus removal agent and sewage can further fuse and react. As the water level rises, the sewage that has been further fused in the fusion zone rises to the inclined pipe for precipitation. The precipitated sewage moves to the phosphorus removal overflow weir as the water level rises and is discharged into the sewage pipe. The settled sludge falls on the inclined pipe and slides down to the bottom of the sedimentation tank according to the layout direction of the inclined pipe.

[0028] A decentralized sewage treatment adjustable self-circulating activated sludge process, comprising the following specific steps

[0029] When the liquid level meter detects that the sewage in the regulating tank is between the low liquid level and the medium liquid level

[0030] S1. The PLC control cabinet controls the water inlet pump to start, and the sewage in the regulating tank enters the SBR reaction tank through the water distributor. The water level of the SBR reaction tank rises until the water level is 10-15cm below the outlet overflow weir. The water inlet pump is turned off to stop water inflow;

[0031] S2. Turn on the aeration fan and set the total aeration time and the on-off ratio. The SBR reactor is aerated intermittently for anoxic nitrogen removal and anaerobic phosphorus release. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off.

[0032] S3. After the intermittent aeration is completed, the aeration fan is in a continuous operation state and continuous aeration begins. The sewage in the SBR reaction tank begins to undergo the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, it is the end of the reaction and the aeration fan is turned off.

[0033] S4. The sewage in the SBR reaction tank settles quietly and begins to separate mud and water. The sedimentation time ranges from 60 to 90 minutes.

[0034] S5. After the sedimentation is completed, the bottom suction pump is turned on to drain the water. When the drainage is completed, the idle period or the next operation cycle begins;

[0035] When the liquid level meter detects that the sewage in the regulating tank is between the low liquid level and the medium liquid level

[0036] S1. Synchronously start the water inlet pump and the bottom suction pump to regulate the SBR reaction tank in the new sewage treatment plant in the tank. The water level of the settled sewage in the SBR reaction tank rises to cross the overflow plate and enter the outlet bearing platform. The bottom suction pump pumps the sewage entering the outlet bearing platform into the outlet overflow weir through the outlet pipe to achieve synchronous water inflow and outflow in the SBR reaction tank.

[0037] S2: The water inflow time is less than or equal to 30 minutes. After the water inflow is completed, the water inflow pump is turned off and the bottom suction pump continues to pump water until the water level drops to 10-15 cm below the outlet overflow weir, and the bottom suction pump is turned off;

[0038] S3. Turn on the aeration fan and set the total aeration time and the on-off ratio. The SBR reactor is aerated intermittently for anoxic nitrogen removal and anaerobic phosphorus release. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off.

[0039] S4. After the intermittent aeration is completed, the aeration fan is in a continuous operation state and continuous aeration begins. The sewage in the SBR reaction tank begins to undergo the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, it is the end of the reaction and the aeration fan is turned off.

[0040] S4. The sewage in the SBR reaction tank settles quietly and begins to separate mud and water. The sedimentation time ranges from 30 to 60 minutes.

[0041] S5. After the sedimentation is completed, the next operation cycle will be automatically started according to the liquid level in the regulating tank.

[0042] By adopting the above technical solution, the PLC control cabinet controls the start and stop of the water inlet pump and bottom suction pump by adjusting the water level in the tank, thus flexibly adjusting the working state of the SBR reactor. When the rural sewage discharge volume is small, the SBR reactor operates normally. When the rural sewage discharge volume increases, the SBR reactor can also increase its sewage treatment speed and the amount of sewage treated in the same time, thereby shortening the sewage treatment cycle of the SBR reactor and improving the volume utilization rate of the SBR reactor.

[0043] Optionally, when the sewage TP in the effluent overflow weir meets the standard

[0044] The PLC control cabinet controls the sewage pump to start, and the sewage at the outlet overflow weir is directly pumped into the sewage pipe through the sewage pump and discharged directly;

[0045] When the sewage TP in the effluent overflow weir does not meet the standard

[0046] S1, PLC control cabinet controls the phosphorus removal dosing pump and sedimentation pump to start at the same time. The phosphorus removal dosing pump injects phosphorus removal agent into the outlet overflow weir. The PLC control cabinet can adjust the speed of the phosphorus removal dosing pump according to the inlet and outlet water TP indicators until the inlet pump is turned off and the phosphorus removal dosing pump is turned off at the same time.

[0047] S2. The wastewater added with the phosphorus removal agent is pumped into the sedimentation inlet pipe through the sedimentation pump for hydraulic mixing, so that the phosphorus removal agent and the wastewater are more fully mixed. The wastewater mixed with the phosphorus removal agent enters the sedimentation tank from the bottom of the sedimentation tank, and the water level in the sedimentation tank rises;

[0048] S3, the wastewater after being mixed with the phosphorus removal agent first undergoes a mixing reaction in the reaction zone. As the water level rises, the wastewater after the mixing reaction in the reaction zone enters the sedimentation zone for sedimentation. The sludge precipitated from the wastewater in the sedimentation zone falls on the inclined pipe and slides down along the inclined pipe to the bottom of the sedimentation tank;

[0049] S4. The dephosphorization wastewater after precipitation flows toward the dephosphorization overflow weir as the water level of the reaction tank rises. The dephosphorization wastewater entering the dephosphorization overflow weir flows into the sewage pipe and is discharged.

[0050] By adopting the above technical solution, the speed of the dephosphorization dosing pump is accurately controlled by the PLC control cabinet, thereby controlling the amount of dephosphorization agent added to the inlet and outlet overflow weirs. This allows the dephosphorization agent added to the inlet and outlet overflow weirs to meet the phosphorus removal treatment requirements of the sewage, saving the amount of dephosphorization agent added. This can optimize the working performance of the SBR reaction tank while also saving costs.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] 1. When the sewage in the regulating tank is between the middle and high liquid levels, the PLC control cabinet controls the water inlet pump and the bottom suction pump to start at the same time. When new sewage is introduced, part of the sewage that has been settled in the SBR reaction tank can be pumped out through the bottom suction pump, which provides space for the new sewage to react and also facilitates extending the time for the remaining sewage at the bottom of the reaction tank to react again, shortening the sewage treatment cycle of the SBR reaction tank and improving the volume utilization rate of the SBR reaction tank;

[0053] 2. The outlet bearing platform and overflow bearing plate can guide the direction of sewage extraction by the bottom suction pump, so that the settled sewage flows from the top of the bottom suction pump to the bottom suction pump, reducing the amount of settled sludge moving in the direction of sewage flow and improving the water quality of sewage extracted by the bottom suction pump;

[0054] 3. When the sewage TP at the outlet overflow weir meets the standard, the PLC control cabinet controls the sewage pump to start; when the sewage TP at the outlet overflow weir does not meet the standard, the PLC control cabinet controls the phosphorus removal dosing pump and the sedimentation pump to start, and the sewage and phosphorus removal agent enter the sedimentation component together for reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a structural diagram of a decentralized sewage treatment adjustable self-circulating activated sludge device of the present application.

[0056] Figure 2 This is a connection diagram of the PLC control cabinet in an embodiment of the present application.

[0057] In the figure: 1. Equalization tank; 2. SBR reaction tank; 3. Water inlet area; 4. Reaction area; 5. Water outlet area; 6. PLC control cabinet; 7. Liquid level gauge; 8. Water inlet pipeline; 9. Water inlet pump; 10. Aeration plate; 11. Aeration fan; 12. Water outlet pipe; 13. Bottom suction pump; 14. Water distributor; 15. Baffle; 16. Water outlet support platform; 17. Overflow support plate; 18. Aeration shear plate; 19. Slag retaining plate; 20. Water outlet overflow weir; 21. Sewage pipe; 22. Sedimentation pipe; 23. Phosphorus removal dosing pump; 24. Sewage pump; 25. Sedimentation pump; 26. Sedimentation tank; 27. Sedimentation inlet pipe; 28. Inclined pipe; 29. ​​Phosphorus removal overflow weir; 30. Carbon source dosing pump; 31. Sludge discharge pipe; 32. Sludge discharge pump; 33. Sludge storage tank. DETAILED DESCRIPTION

[0058] The following is combined with Figure 1-2 This application is described in further detail.

[0059] The present application discloses a decentralized sewage treatment adjustable self-circulating activated sludge device. Figure 1 and Figure 2 The device includes a regulating tank 1, an SBR reaction tank 2 and a PLC control cabinet 6.

[0060] Among them, a liquid level meter 7 for detecting the depth of sewage is installed in the regulating tank 1, an inlet pipe 8 is connected between the regulating tank 1 and the SBR reaction tank 2, an inlet pump 9 connected to the inlet pipe 8 is provided in the regulating tank 1, an aeration system is provided in the SBR reaction tank 2, and the SBR reaction tank 2 is connected to an outlet pipe 12. One end of the outlet pipe 12 is located in the SBR reaction tank 2 and is connected to a bottom suction pump 13 and the other end extends out of the SBR reaction tank 2. The bottom suction pump 13 is located at the upper part of the SBR reaction tank 2.

[0061] In addition, the PLC control cabinet 6 is connected to the liquid level meter 7, the water inlet pump 9, the aeration system, and the bottom suction pump 13. When the water inlet pump 9 and bottom suction pump 13 are turned off, the aeration system is turned on, and the wastewater in the SBR reactor 2 begins to react and settle. After the raw wastewater in the SBR reactor 2 settles, the bottom suction pump 13 is turned on, and the settled wastewater in the SBR reactor 2 is discharged from the SBR reactor 2. The water inlet pump 9 is turned on, and the new wastewater in the regulating tank 1 is discharged into the SBR reactor 2.

[0062] When the sewage in the regulating tank 1 is between the low liquid level and the medium liquid level, the PLC control cabinet 6 controls the water inlet pump 9 and the bottom suction pump 13 to not start at the same time, so that the SBR reaction tank 2 can work normally, extend the treatment time of the sewage, and strengthen the denitrification and phosphorus removal treatment of the sewage.

[0063] When the sewage in the regulating tank 1 is between the middle and high liquid levels, the PLC control cabinet 6 controls the water inlet pump 9 and the bottom suction pump 13 to start simultaneously, and water is simultaneously introduced into and discharged from the SBR reaction tank 2. When new sewage is introduced, a portion of the previously settled sewage in the SBR reaction tank 2 can be pumped out through the bottom suction pump 13, providing space for the new sewage to react while also extending the time for the remaining sewage at the bottom of the SBR reaction tank 2 to react again, shortening the sewage treatment cycle of the SBR reaction tank 2 and improving the volume utilization rate of the SBR reaction tank 2.

[0064] The SBR reaction tank 2 is divided into an inlet zone 3, a reaction zone 4 and an outlet zone 5 in sequence along its length.

[0065] Among them, the end of the water inlet pipe 8 facing away from the water inlet pump 9 is located in the water inlet area 3. A water distributor 14 and a deflection baffle 15 are provided in the water inlet area 3 of the SBR reaction tank 2. The water distributor 14 is installed at the bottom of the SBR reaction tank 2, with the water outlet of the water distributor 14 facing upward. The water inlet pipe 8 is connected with the water inlet of the water distributor 14, so that the new sewage gradually diffuses upward from the bottom of the SBR reaction tank 2 through the water distributor 14. The deflection baffle 15 is arranged vertically and is located on the side of the water distributor 14 facing the reaction zone 4. There is a gap between the deflection baffle 15 and the bottom of the SBR reaction tank 2 and the two side walls opposite to the SBR reaction tank 2 are sealed. The new sewage sprayed toward the reaction zone 4 can be intercepted by the deflection baffle 15, and the new sewage is guided into the reaction zone 4 through the channel between the deflection baffle 15 and the bottom of the SBR reaction tank 2, so that the new sewage diffuses from bottom to top in the reaction zone 4, thereby further reducing the impact of the new sewage on the sewage that has already settled in the SBR reaction tank 2 when entering the SBR reaction tank 2.

[0066] In addition, the aeration device includes an aeration plate 10 located at the bottom of the reaction zone 4 of the SBR reaction tank 2 and an aeration fan 11 connected to the aeration plate 10. The aeration fan 11 is connected to the PLC control cabinet 6. A carbon source dosing pump 30 is provided above the SBR reaction tank 2. When new sewage enters the SBR reaction tank 2 from the water distributor 14, the sewage is sprayed upward along the outlet of the water distributor 14. The carbon source dosing pump 30 adds a carbon source agent to the water inlet area 3. The carbon source agent flows downward, and the new sewage and the carbon source agent flow in opposite directions, which can accelerate the fusion speed of the new sewage and the carbon source agent. The carbon source dosing pump 30 is connected to the PLC control cabinet 6, and the PLC control cabinet 6 controls the amount of carbon source agent injected by the carbon source dosing pump 30.

[0067] In addition, an outlet pedestal 16 is provided at the outlet area 5 of the SBR reaction tank 2. The outlet pedestal 16 is located above the aeration plate 10. The bottom suction pump 13 is mounted on the upper end surface of the outlet pedestal 16. An overflow plate 17 is provided around the upper end surface of the outlet pedestal 16 for allowing settled sewage to overflow to the bottom suction pump 13. The outlet pedestal 16 and overflow plate 17 guide the bottom suction pump 13 to only extract settled sewage located above the outlet pedestal 16. The settled sewage is simultaneously guided from above the bottom suction pump 13 to flow toward the bottom suction pump 13, thereby reducing the amount of settled sludge that moves along the flow direction of the sewage and improving the water quality of the sewage extracted by the bottom suction pump 13.

[0068] To further optimize the quality of wastewater extracted by the bottom suction pump 13, a slag retaining plate 19 is installed on the side of the outlet pedestal 16 facing the reaction zone 4 to block suspended solids in the reaction zone 4. An aeration shear plate 18 is also installed below the outlet pedestal 16 to squeeze large bubbles generated by aeration in the reaction zone 4 into small bubbles, thereby reducing the amount of sludge that falls onto the outlet pedestal 16 during aeration.

[0069] Reference Figure 1 and Figure 2 Above the bottom-suction pump 13, an outflow overflow weir 20 is installed. One end of the outflow overflow weir 20 is connected to the outflow pipe 12, and the other side is connected to a sewage pipe 21 and a sedimentation pipe 22. A dephosphorization dosing pump 23 is installed on top of the outflow overflow weir 20. The sewage pipe 21, connected to the outflow overflow weir 20, is connected to a sewage pump 24. The sedimentation pipe 22, connected to the outflow overflow weir 20, is connected to a sedimentation pump 25. The other end of the sedimentation pipe 22 is connected to a sedimentation assembly for mixing and treating the wastewater after the dephosphorization agent is added. The dephosphorization dosing pump 23, sewage pump 24, and sedimentation pump 25 are all connected to the PLC control cabinet 6.

[0070] When the sewage in the regulating tank 1 is between the low liquid level and the middle liquid level, the water inlet pump 9 and the bottom suction pump 13 are not started at the same time, and the sewage in the SBR reaction tank 2 has sufficient time to be denitrified and dephosphorized.

[0071] When the sewage in the regulating tank 1 is between the middle and high liquid levels, the water inlet pump 9 and the bottom suction pump 13 are turned on at the same time, the time the sewage stays in the SBR reaction tank 2 is reduced, and the sewage dephosphorization time is short. When the sewage TP at the effluent overflow weir 20 meets the standard, the PLC control cabinet 6 controls the sewage pump 24 to start, and the sewage is directly discharged. When the sewage TP at the effluent overflow weir 20 does not meet the standard, the PLC control cabinet 6 needs to control the dephosphorization dosing pump 23 and the sedimentation pump 25 to start, and according to the TP index, the PLC control cabinet 6 controls the speed of the dephosphorization dosing pump 23 to adjust the dosage of the dephosphorization agent entering the effluent overflow weir 20, so as to dephosphorize the sewage at the effluent overflow weir 20. Achieve the dephosphorization effect of sewage while saving costs.

[0072] Reference Figure 1 and Figure 2 The sedimentation assembly includes a sedimentation tank 26, a sedimentation inlet pipe 27, an inclined pipe 28, a dephosphorization overflow weir 29, a mud discharge pipe 31, a mud discharge pump 32 and a mud storage tank 33.

[0073] The sedimentation tank 26 is divided from top to bottom into a settling zone and a fusion zone. A settling inlet pipe 27 connects to the settling pipe 22 at one end and extends into the fusion zone of the sedimentation tank 26 at the other end. Multiple inclined pipes 28 are arranged upward at an angle, and are installed horizontally and spaced apart within the settling zone of the sedimentation tank 26. A phosphorus removal overflow weir 29 is installed at the top of the settling zone of the sedimentation tank 26 and connects to the sewage pipe 21.

[0074] The sewage mixed with the dephosphorization agent is hydraulically mixed while flowing in the sedimentation inlet pipe 27, so that the sewage and the dephosphorization agent are more fully fused. After that, the sewage mixed with the dephosphorization agent flows into the sedimentation tank 26 from the bottom of the sedimentation tank 26. Since the sewage continuously enters the fusion zone of the sedimentation tank 26, the sewage is always in a state of flow and tumbling in the fusion zone, so as to facilitate further fusion reaction between the dephosphorization agent and the sewage. As the water level rises, the sewage that has been further fused in the fusion zone rises to the inclined pipe 28 for precipitation. The precipitated sewage moves to the dephosphorization overflow weir 29 as the water level rises and is discharged into the sewage pipe 21. The settled sludge falls on the inclined pipe 28 and slides down the inclined pipe 28 to the bottom of the sedimentation tank 26.

[0075] Furthermore, sludge that settles to the bottom of sedimentation tank 26 requires regular cleaning to prevent it from clogging sedimentation inlet pipe 27. Therefore, a sludge storage tank 33 is located on one side of the SBR reactor 2 and is connected to one end of a sludge discharge pipe 31. The other end of the sludge discharge pipe 31 from the sludge storage tank 33 is connected to the bottom of sedimentation tank 26. A sludge discharge pump 32 is mounted on this pipe and connected to a PLC control cabinet 6. The PLC control cabinet 6 controls the opening and closing of the sludge discharge pump 32, allowing the sludge at the bottom of sedimentation tank 26 to be regularly pumped into the sludge storage tank 33.

[0076] The implementation principle of a decentralized sewage treatment adjustable self-circulating activated sludge device according to an embodiment of the present application is as follows: when the sewage in the regulating tank 1 is between the low liquid level and the middle liquid level, the PLC control cabinet 6 controls the water inlet pump 9 and the bottom suction pump 13 to not start at the same time, so that the SBR reaction tank 2 can work normally. When the sewage in the regulating tank 1 is between the middle and high liquid levels, the PLC control cabinet 6 controls the water inlet pump 9 and the bottom suction pump 13 to start at the same time. When new sewage is introduced, a part of the sewage originally settled in the SBR reaction tank 2 can be extracted through the bottom suction pump 13, which provides space for the new sewage reaction while also facilitating the extension of the time for the remaining sewage at the bottom of the reaction tank to react again, shortening the sewage treatment cycle of the SBR reaction tank 2 and improving the volume utilization rate of the SBR reaction tank 2.

[0077] The present application also discloses a decentralized sewage treatment adjustable self-circulating activated sludge process, which specifically includes the following steps:

[0078] When the liquid level meter 7 detects that the sewage in the regulating tank 1 is between the low liquid level and the medium liquid level

[0079] S1, PLC control cabinet 6 controls the water inlet pump 9 to start, the sewage in the regulating tank 1 enters the SBR reaction tank 2 through the water distributor 14, and the water level of the SBR reaction tank 2 rises until the water level is 10-15 cm below the outlet overflow weir 20, and the water inlet pump 9 is turned off to stop water inflow;

[0080] S2. Turn on the aeration fan 11 and set the total intermittent aeration time and the on-off ratio. The SBR reaction tank 2 performs intermittent aeration for anoxic nitrogen removal and anaerobic phosphorus release. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off.

[0081] During the intermittent aeration process, when the effluent water quality has high requirements for TN and the influent carbon source is insufficient, the PLC control cabinet 6 turns on the carbon source dosing pump 30 after the influent pump 9 is turned off, and the carbon source dosing pump 30 adds carbon source reagent into the SBR reaction tank 2. The dosage of the carbon source reagent in the SBR reaction tank 2 is calculated by the inlet and outlet TN and the carbon source C / N. The PLC control cabinet 6 can adjust the speed of the carbon source dosing pump 30 to adjust the dosing flow rate of the carbon source dosing pump 30, thereby ensuring that the sewage after sedimentation in the SBR reaction tank 2 meets the standards while saving costs;

[0082] S3. After the intermittent aeration is completed, the aeration fan 11 is in a continuous operation state and continuous aeration begins. The sewage in the SBR reaction tank 2 begins the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, it is the end of the reaction and the aeration fan 11 is turned off.

[0083] S4. The sewage in SBR reaction tank 2 is statically settled and the sewage begins to separate mud and water. The settling time ranges from 60 to 90 minutes.

[0084] S5, after the sedimentation is completed, the bottom suction pump 13 is turned on to drain the water, and when the drainage is completed, the idle period or the next operation cycle is entered;

[0085] When the liquid level meter 7 detects that the sewage in the regulating tank 1 is between the middle liquid level and the high liquid level

[0086] S1. Synchronously start the water inlet pump 9 and the bottom suction pump 13. In the SBR reaction tank 2 in the new sewage machine in the regulating tank 1, the water level of the settled sewage in the SBR reaction tank 2 rises to cross the overflow plate 17 and enter the outlet support 16. The bottom suction pump 13 pumps the sewage entering the outlet support 16 into the outlet overflow weir 20 through the outlet pipe 12, so as to achieve synchronous water inflow and drainage in the SBR reaction tank 2.

[0087] S2, the water inflow time is less than or equal to 30 minutes. After the water inflow is completed, the water inflow pump 9 is turned off, and the bottom suction pump 13 continues to pump water until the water level drops to 10-15 cm below the outlet overflow weir 20, and the bottom suction pump 13 is turned off;

[0088] S3, start the aeration fan 11 and set the total time of intermittent aeration and the on-off ratio. The SBR reaction tank 2 performs intermittent aeration for anoxic denitrification. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off.

[0089] S4. After the intermittent aeration is completed, the aeration fan 11 is in a continuous operation state, and continuous aeration begins. The sewage in the SBR reaction tank 2 begins to undergo the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, the reaction ends and the aeration fan 11 is turned off.

[0090] S4. The sewage in the SBR reaction tank 2 is statically settled and the sewage begins to separate mud and water. The settling time ranges from 30 to 60 minutes.

[0091] S5. After the sedimentation is completed, the next operation cycle will be automatically started according to the liquid level of regulating tank 1.

[0092] When the sewage TP in the effluent overflow weir 20 reaches the standard

[0093] The PLC control cabinet 6 controls the sewage pump 24 to start, and the sewage at the outlet overflow weir 20 is directly pumped into the sewage pipe 21 through the sewage pump 24 and discharged directly;

[0094] When the sewage TP in the effluent overflow weir 20 does not meet the standard

[0095] S1, the PLC control cabinet 6 simultaneously controls the dephosphorization dosing pump 23 and the sedimentation pump 25 to start, and the dephosphorization dosing pump 23 injects dephosphorization agent into the outlet overflow weir 20. The PLC control cabinet 6 can adjust the speed of the dephosphorization dosing pump 23 according to the inlet and outlet water TP indicators until the water inlet pump 9 is turned off, and the dephosphorization dosing pump 23 is turned off at the same time;

[0096] S2, the sewage with the phosphorus removal agent added is pumped into the sedimentation inlet pipe 27 by the sedimentation pump 25 for hydraulic mixing, so that the phosphorus removal agent and the sewage are more fully mixed. The sewage mixed with the phosphorus removal agent enters the sedimentation tank 26 from the bottom of the sedimentation tank 26, and the water level in the sedimentation tank 26 rises;

[0097] S3. The wastewater after being mixed with the phosphorus removal agent first undergoes a mixing reaction in the reaction zone 4. As the water level rises, the wastewater after the mixing reaction in the reaction zone 4 enters the sedimentation zone for sedimentation. The sludge precipitated from the wastewater in the sedimentation zone falls on the inclined pipe 28 and slides down along the inclined pipe 28 to the bottom of the sedimentation tank 26.

[0098] The sludge that falls on the bottom of the sedimentation tank 26 is regularly treated. The sludge pump 32 is turned on by the PLC control cabinet 6, and the sludge is pumped into the sludge storage tank 33 through the sludge discharge pipe 31;

[0099] S4. The dephosphorization wastewater after precipitation flows toward the dephosphorization overflow weir 29 as the water level of the reaction tank rises. The dephosphorization wastewater entering the dephosphorization overflow weir 29 flows into the sewage pipe 21 and is discharged.

[0100] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A decentralized sewage treatment adjustable self-circulating activated sludge device, characterized by: It includes a regulating tank (1), an SBR reaction tank (2) and a PLC control cabinet (6); A liquid level meter (7) for detecting sewage depth is installed in the regulating tank (1); a water inlet pipeline (8) is connected between the regulating tank (1) and the SBR reaction tank (2); a water inlet pump (9) connected to the water inlet pipeline (8) is provided in the regulating tank (1); an aeration system is provided in the SBR reaction tank (2); a water outlet pipe (12) is connected to the SBR reaction tank (2); one end of the water outlet pipe (12) is connected to a bottom suction pump (13) in the SBR reaction tank (2), and the other end extends out of the SBR reaction tank (2); The PLC control cabinet (6) is connected to the liquid level meter (7), the water inlet pump (9), the aeration system and the bottom suction pump (13). When the water inlet pump (9) and the bottom suction pump (13) are turned off, the aeration system is turned on, and the sewage in the SBR reaction tank (2) begins to react and precipitate. When the original sewage in the SBR reaction tank (2) is precipitated, the bottom suction pump (13) is turned on, and the precipitated sewage in the SBR reaction tank (2) is discharged from the SBR reaction tank (2). The water inlet pump (9) is turned on, and the new sewage in the regulating tank (1) is discharged into the SBR reaction tank (2). When the sewage in the regulating tank (1) is between a low liquid level and a middle liquid level, the PLC control cabinet (6) controls the water inlet pump (9) and the bottom suction pump (13) to start at different times; when the sewage in the regulating tank (1) is between a middle liquid level and a high liquid level, the PLC control cabinet (6) controls the water inlet pump (9) and the bottom suction pump (13) to start at the same time, and water is introduced into and discharged from the SBR reaction tank (2) synchronously.

2. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 1, characterized in that: The SBR reaction tank (2) is divided into a water inlet zone (3), a reaction zone (4) and a water outlet zone (5) in sequence along its length direction; the end of the water inlet pipe (8) facing away from the water inlet pump (9) is located in the water inlet zone (3); the aeration device comprises an aeration plate (10) located at the bottom of the reaction zone (4) of the SBR reaction tank (2) and an aeration fan (11) connected thereto; the bottom suction pump (13) is located in the water outlet zone (5) of the SBR reaction tank (2), and the bottom suction pump (13) is located above the aeration plate (10).

3. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 2, characterized in that: A water distributor (14) and a baffle (15) are provided in the water inlet area (3) of the SBR reaction tank (2); the water distributor (14) is installed at the bottom of the SBR reaction tank (2); the water inlet pipeline (8) is communicated with the water distributor (14); the baffle (15) is arranged vertically and is located on a side of the water distributor (14) facing the reaction area (4); the baffle (15) is located above the water distributor (14) and is used to prevent sewage discharged from the water distributor (14) from splashing toward the reaction area (4).

4. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 2, characterized in that: A water outlet support (16) is provided at the water outlet area (5) of the SBR reaction tank (2), the water outlet support (16) is located above the aeration plate (10), the bottom suction pump (13) is installed on the upper end surface of the water outlet support (16), and an overflow support plate (17) is provided around the upper end surface of the water outlet support (16) for allowing the settled sewage to overflow to the bottom suction pump (13).

5. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 4, characterized in that: An aeration shear plate (18) is provided below the water outlet support (16) for squeezing large bubbles generated by aeration in the reaction zone (4) into small bubbles, and a slag blocking plate (19) is provided on the side of the water outlet support (16) facing the reaction zone (4) for blocking suspended solids in the reaction zone (4).

6. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 2, characterized in that: A water outlet overflow weir (20) is provided above the bottom suction pump (13), one end of the water outlet overflow weir (20) is connected to the water outlet pipe (12), and the other side is connected to a sewage pipe (21) and a sedimentation pipe (22), a phosphorus removal dosing pump (23) is provided on the top of the water outlet overflow weir (20), one end of the sewage pipe (21) connected to the water outlet overflow weir (20) is connected to a sewage pump (24), one end of the sedimentation pipe (22) connected to the water outlet overflow weir (20) is connected to a sedimentation pump (25), and the other end of the sedimentation pipe (22) is connected to a sedimentation component for mixing and treating the sewage after adding the phosphorus removal agent.

7. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 6, characterized in that: The dephosphorization dosing pump (23), the sewage pump (24) and the sedimentation pump (25) are all connected to a PLC control cabinet (6); when the sewage TP at the outlet overflow weir (20) meets the standard, the PLC control cabinet (6) controls the sewage pump (24) to start; when the sewage TP at the outlet overflow weir (20) does not meet the standard, the PLC control cabinet (6) controls the dephosphorization dosing pump (23) and the sedimentation pump (25) to start, and according to the TP index, the PLC control cabinet (6) controls the rotation speed of the dephosphorization dosing pump (23) to adjust the dosage of the dephosphorization agent entering the outlet overflow weir (20).

8. The decentralized sewage treatment adjustable self-circulating activated sludge device according to claim 7, characterized in that: The sedimentation assembly includes a sedimentation tank (26), a sedimentation inlet pipe (27), an inclined pipe (28) and a dephosphorization overflow weir (29); The sedimentation tank (26) is divided into a sedimentation zone and a mixing zone from top to bottom. One end of the sedimentation inlet pipe (27) is connected to the sedimentation pipe (22) and the other end extends into the mixing zone of the sedimentation tank (26). The inclined pipe (28) is arranged obliquely upward and is provided in plurality. The plurality of inclined pipes (28) are installed horizontally at intervals in the sedimentation zone of the sedimentation tank (26). The phosphorus removal overflow weir (29) is installed at the top of the sedimentation zone of the sedimentation tank (26). The phosphorus removal overflow weir (29) is connected to the sewage pipe (21).

9. A decentralized sewage treatment adjustable self-circulating activated sludge process, characterized by: The method comprises the decentralized sewage treatment adjustable self-circulating activated sludge device according to any one of claims 1 to 8, further comprising the following specific steps: When the liquid level meter (7) detects that the sewage in the regulating tank (1) is between the low liquid level and the medium liquid level: S1, PLC control cabinet (6) controls the water inlet pump (9) to start, and the sewage in the regulating tank (1) enters the SBR reaction tank (2) through the water distributor (14), and the water level of the SBR reaction tank (2) rises until the water level is 10-15 cm below the outlet overflow weir (20), and then the water inlet pump (9) is turned off to stop water inflow; S2, start the aeration fan (11) and set the total time of intermittent aeration and the on-off ratio. The SBR reaction tank (2) performs intermittent aeration for anoxic nitrogen removal and anaerobic phosphorus release. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off. S3. After the intermittent aeration is completed, the aeration fan (11) is in a continuous operation state and continuous aeration begins. The sewage in the SBR reaction tank (2) begins to undergo the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, it is the end of the reaction and the aeration fan (11) is turned off. S4. The sewage in the SBR reaction tank (2) is allowed to settle statically, and the sewage begins to separate into mud and water. The settling time ranges from 60 to 90 minutes. S5. After the sedimentation is completed, the bottom suction pump (13) is turned on to drain the water. When the drainage is completed, the idle period or the next operation cycle is entered; When the liquid level meter (7) detects that the sewage in the regulating tank (1) is between the middle liquid level and the high liquid level: S1. Synchronously start the water inlet pump (9) and the bottom suction pump (13). In the SBR reaction tank (2) in the new sewage machine in the regulating tank (1), the water level of the sewage that has settled in the SBR reaction tank (2) rises to pass over the overflow support plate (17) and enter the water outlet support platform (16). The bottom suction pump (13) pumps the sewage that has entered the water outlet support platform (16) into the water outlet overflow weir (20) through the water outlet pipe (12), so as to achieve synchronous water inflow and water outflow in the SBR reaction tank (2); S2, the water inlet time is less than or equal to 30 minutes. After the water inlet is completed, the water inlet pump (9) is turned off, and the bottom suction pump (13) continues to pump water until the water level drops to 10-15 cm below the outlet overflow weir (20). The bottom suction pump (13) is turned off; S3, start the aeration fan (11) and set the total time of intermittent aeration and the on-off ratio. The SBR reaction tank (2) performs intermittent aeration for anoxic nitrogen removal and anaerobic phosphorus release. When the DO is less than 0.3 mg / L, the intermittent aeration time is 30 minutes and the on-off ratio is 8 minutes on and 2 minutes off. S4. After the intermittent aeration is completed, the aeration fan (11) is in a continuous operation state and continuous aeration begins. The sewage in the SBR reaction tank (2) begins to undergo the ammonia nitrogen nitrification stage and the denitrification stage. The DO is controlled at 0.5-3.0 mg / L. When the DO suddenly rises in the reactor, it is the end of the reaction and the aeration fan (11) is turned off. S5. The sewage in the SBR reaction tank (2) is allowed to settle statically, and the sewage begins to separate into mud and water. The settling time ranges from 30 to 60 minutes. S6. After the sedimentation is completed, the next operation cycle will be automatically started according to the liquid level in the regulating tank (1).

10. The decentralized sewage treatment adjustable self-circulating activated sludge process according to claim 9, characterized in that: When the sewage TP in the effluent overflow weir (20) reaches the standard: The PLC control cabinet (6) controls the sewage pump (24) to start, and the sewage located at the outlet overflow weir (20) is directly pumped into the sewage pipe (21) through the sewage pump (24) and discharged directly; When the sewage TP in the effluent overflow weir (20) does not meet the standard: S1, the PLC control cabinet (6) simultaneously controls the dephosphorization dosing pump (23) and the sedimentation pump (25) to start, the dephosphorization dosing pump (23) injects dephosphorization agent into the outlet overflow weir (20), and the PLC control cabinet (6) can adjust the speed of the dephosphorization dosing pump (23) according to the inlet and outlet water TP indicators until the water inlet pump (9) is turned off, and the dephosphorization dosing pump (23) is turned off at the same time; S2, the sewage added with the phosphorus removal agent is pumped into the sedimentation inlet pipe (27) through the sedimentation pump (25) for hydraulic mixing, so that the phosphorus removal agent and the sewage are more fully mixed, and the sewage mixed with the phosphorus removal agent enters the sedimentation tank (26) from the bottom of the sedimentation tank (26), and the water level in the sedimentation tank (26) rises; S3, the sewage after being mixed with the phosphorus removal agent is first subjected to a mixing reaction in the reaction zone (4). As the water level rises, the sewage after the mixing reaction in the reaction zone (4) enters the sedimentation zone for sedimentation. The sludge precipitated from the sewage in the sedimentation zone falls on the inclined pipe (28) and slides down along the inclined pipe (28) to the bottom of the sedimentation tank (26); S4. The dephosphorization wastewater after precipitation flows toward the dephosphorization overflow weir (29) as the water level of the sedimentation tank (26) rises. The dephosphorization wastewater entering the dephosphorization overflow weir (29) flows into the sewage pipe (21) and is discharged.

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