Device and method for realizing sludge separation and double-sludge anammox simultaneously

Abstract

The application provides a device and method for realizing sludge separation and double-sludge anaerobic ammonia oxidation synchronously, which comprises the following steps: sewage flows into a first anaerobic tank from an original water tank; meanwhile, part of sludge at the bottom of an activated sludge system flows back to the first anaerobic tank; part of sludge-water mixture flows into a second anaerobic tank from the first anaerobic tank, and then flows through a first aerobic tank and a second aerobic tank from the second anaerobic tank in sequence; part of sludge-water mixture flows into an inclined plate separator from the second aerobic tank; sludge separation is realized by an inclined plate in the inclined plate separator; sludge with a particle size greater than a preset value is intercepted above the inclined plate, and sludge with a particle size less than or equal to the preset value passes through the inclined plate and is located below the inclined plate; part of sludge-water mixture above the inclined plate enters the activated sludge system; part of sludge-water mixture below the inclined plate enters a biofilm system; and denitrification is realized by the activated sludge system and the biofilm system respectively.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an apparatus and method for simultaneously performing sludge sorting and dual sludge anaerobic ammonia oxidation. Background Technology

[0002] Frequent water pollution directly or indirectly impacts human life and health. Coupled with increasingly stringent wastewater treatment and discharge standards, nitrogen removal is both a key issue in wastewater treatment and an area urgently needing breakthroughs. Anaerobic ammonia oxidation, as an emerging wastewater denitrification technology, has been widely studied. It removes nitrogen from NH4+. + -N and NO2 - -N acts as both electron donor and acceptor to complete the denitrification process, eliminating the need for aeration and carbon source addition throughout the entire process, achieving deep denitrification while saving energy and reducing consumption.

[0003] In recent years, the AOA (Anaerobic Ammonia Oxidation) process has become a model of successful application of anaerobic ammonia oxidation technology, gradually moving from the laboratory to engineering practice. This process stores the carbon source in the anaerobic zone, performs short-cut nitrification in the aerobic zone, and simultaneously allows denitrification and anaerobic ammonia oxidation to occur in the anoxic zone, achieving nitrogen removal. Compared to traditional wastewater treatment processes, the AOA process can effectively utilize the existing carbon source in the wastewater to a certain extent, reducing reagent dosage costs and saving aeration energy. However, on the one hand, aeration control in the aerobic zone is difficult and not easy to operate, which can easily lead to a lack of substrate NH4 in the subsequent anaerobic ammonia oxidation process. + -N or NO2 - -N, on the other hand, the treatment and disposal costs of a large amount of excess sludge are high, and the effluent after the secondary sedimentation tank is prone to carrying sludge, resulting in poor effluent quality.

[0004] Patent document CN116553725A (application number: 202310419374.6) discloses an AOA system and method for treating urban wastewater with a low carbon-to-nitrogen ratio, which utilizes an automatic control system to monitor NH4 online. + The method of controlling aeration volume and aeration time by using -N concentration requires the addition of carbon source to the anaerobic zone during operation, which not only increases operating costs but also increases the production of excess sludge.

[0005] Based on the AOA process, this invention proposes a device and method for simultaneously achieving sludge sorting and dual sludge anaerobic ammonia oxidation. An inclined plate separator is added at the rear end of the aerobic zone to sort the mixed sludge according to different particle sizes. The anoxic zone is divided into an activated sludge system and a biofilm system. While enriching the sludge through anaerobic ammonia oxidation, the selective retention and discharge of sludge from the system are achieved, which not only ensures deep denitrification but also reduces the pressure on sludge treatment and disposal. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide an apparatus and method for simultaneously realizing sludge sorting and dual sludge anaerobic ammonia oxidation.

[0007] According to the present invention, a device for simultaneously realizing sludge sorting and dual sludge anaerobic ammonia oxidation includes: a raw water tank 1, an anaerobic / aerobic tank 2, an inclined plate separator 3, an activated sludge system 4, and a biofilm system 5.

[0008] The anaerobic / aerobic tank 2 includes a first anaerobic tank 21, a second anaerobic tank 22, a first aerobic tank 23, and a second aerobic tank 24;

[0009] Wastewater flows from the raw water tank 1 into the first anaerobic tank 21; simultaneously, some sludge from the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21; some sludge-water mixture flows from the first anaerobic tank 21 into the second anaerobic tank 23, and then flows from the second anaerobic tank 23 through the first aerobic tank 23 and the second aerobic tank 24 in sequence; some sludge-water mixture flows from the second aerobic tank 24 into the inclined plate separator 3, where the sludge-water mixture undergoes sludge sorting through the inclined plate 34 inside the inclined plate separator 3. Sludge with a particle size larger than a preset value is retained above the inclined plate 34, while sludge with a particle size smaller than or equal to the preset value is located below the inclined plate 34; some sludge-water mixture located above the inclined plate 34 enters the activated sludge system 4; some sludge-water mixture located below the inclined plate 34 enters the biofilm system 5, where denitrification is achieved through the activated sludge system 4 and the biofilm system 5, respectively.

[0010] Preferably, the wastewater flows from the raw water tank 1 into the first anaerobic tank 21 of the anaerobic / aerobic tank 2 via the first peristaltic pump 11 and the first inlet 212.

[0011] Preferably, a portion of the mud-water mixture flows sequentially from the second anaerobic tank 22 through the first aerobic tank 23 and the second aerobic tank 24, and the dissolved oxygen concentrations of the first aerobic tank 23 and the second aerobic tank 24 are controlled by the first rotor flowmeter 233 and the second rotor flowmeter 243 to a preset value.

[0012] Preferably, the first anaerobic tank 21 is provided with a first stirring device 211; the second anaerobic tank 22 is provided with a second stirring device 221; the first aerobic tank 23 is provided with a third stirring device 231; and the second aerobic tank 24 is provided with a fourth stirring device 241. The first stirring device 211, the second stirring device 221, the third stirring device 231 and the fourth stirring device 241 are used for mechanical stirring to ensure that the activated sludge and wastewater are in a uniformly mixed state.

[0013] A first aeration disc 232 and a second aeration disc 242 are respectively provided in the first aerobic tank 23 and the second aerobic tank 24; the first aeration disc 232 and the second aeration disc 242 are used to provide oxygen with uniform distribution to the first aerobic tank 23 and the second aerobic tank 24 respectively.

[0014] Preferably, a portion of the mud-water mixture flows from the second aerobic tank 24 into the inclined plate separator 3 through the first outlet 244 and the second inlet 31.

[0015] Preferably, a portion of the mud-water mixture located above the inclined plate 34 enters the activated sludge system 4 through the inclined plate separator 3 via the second outlet 32, the third peristaltic pump 35, and the third inlet 41;

[0016] A portion of the mud-water mixture located below the inclined plate 34 enters the biofilm system 5 through the inclined plate separator 3 via the third outlet 33, the fourth peristaltic pump 36, and the fourth inlet 51.

[0017] Preferably, the supernatant of the activated sludge system 4 is discharged through the fourth outlet 42, the gas escapes through the top of the first three-phase separator 44, and part of the sludge at the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21 through the first sludge discharge port 45 and the second peristaltic pump 26, and part of the remaining sludge is discharged through the first sludge discharge pipe 46.

[0018] Preferably, the supernatant of the biofilm system 5 is discharged through the fifth outlet 52, the gas escapes through the top of the second three-phase separator 55, and the sludge at the bottom of the biofilm system 5 is discharged through the second sludge discharge port 56 and the second sludge discharge pipe 57.

[0019] Specifically, the activated sludge system 4 and the biofilm system 5 further include a first flow mixer 43 and a second flow mixer 53; the first flow mixer 43 and the second flow mixer 53 are used to uniformly mix the activated sludge entering the activated sludge system 4 and the biofilm system 5 with the wastewater.

[0020] According to the present invention, a method for simultaneously achieving sludge sorting and dual anaerobic ammonia oxidation of sludge is provided, which utilizes the aforementioned apparatus for simultaneously achieving sludge sorting and dual anaerobic ammonia oxidation of sludge to perform the following steps:

[0021] Step S1: Wastewater enters the first anaerobic tank from the raw water tank. At the same time, some sludge from the bottom of the activated sludge system is returned to the first anaerobic tank, and some sludge-water mixture flows from the first anaerobic tank into the second anaerobic tank. The hydraulic retention time of the first and second anaerobic tanks is a preset time. Polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria convert the COD in the wastewater into an internal carbon source and store it in their bodies.

[0022] Step S2: A portion of the sludge-water mixture flows sequentially from the second anaerobic tank through the first and second aerobic tanks. The dissolved oxygen concentrations in the first and second aerobic tanks are controlled by the first and second rotor flow meters, respectively. The total hydraulic retention time in the first and second aerobic tanks is a preset value, controlling the NH4+ at the first outlet. + -N concentration is preset value, short-cut nitrification is carried out using nitrifying bacteria to enrich AOB and inhibit NOB;

[0023] Step S3: Part of the mud-water mixture flows into the inclined plate separator from the second aerobic tank through the first outlet and the second inlet. The mud-water mixture is separated into sludge by the inclined plates inside the inclined plate separator. Sludge with a particle size larger than the preset value is trapped above the inclined plate, while sludge with a particle size smaller than or equal to the preset value is located below the inclined plate. The liquid is evenly mixed in the entire inclined plate separator.

[0024] Step S4: Part of the mud-water mixture located above the inclined plate enters the activated sludge system. The hydraulic retention time of the activated sludge system is a preset value, and nitrogen is removed through endogenous denitrification and anaerobic ammonium oxidation processes.

[0025] Step S5: Part of the mud-water mixture located below the inclined plate enters the biofilm system. Polyethylene plastic ring packing is added to the biofilm system. The hydraulic retention time of the biofilm system is a preset value. Nitrogen removal is achieved through anaerobic ammonia oxidation and endogenous denitrification.

[0026] Step S6: The supernatant of the activated sludge system is discharged through the fourth outlet, the gas escapes through the top of the first three-phase separator, and some of the remaining sludge is discharged through the first sludge discharge pipe; the supernatant of the biofilm system is discharged through the fifth outlet, the gas escapes through the top of the second three-phase separator, and the sludge at the bottom of the biofilm system is discharged through the second sludge discharge pipe.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This invention provides a device and method for simultaneously achieving sludge sorting and dual sludge anaerobic ammonia oxidation. Its purpose is to add an inclined plate separator after the aerobic tank based on sludge particle size, and to separate the activated sludge system and biofilm system in the anoxic zone, so as to achieve efficient removal of major pollutants such as total nitrogen and COD, meet the urban sewage discharge standards, and solve the problems of complex aeration control, high cost of residual sludge treatment and disposal, and poor effluent quality caused by sludge easily carried in the effluent in the AOA process.

[0029] 2. Compared with the existing AOA process, the device and method for simultaneously realizing sludge sorting and dual sludge anaerobic ammonium oxidation provided by the present invention do not require an external carbon source, do not require strict control of aeration, produce less residual sludge, are environmentally friendly, and have low operating costs.

[0030] 3. The apparatus and method for simultaneously realizing sludge sorting and dual sludge anaerobic ammonia oxidation provided by the present invention can realize a dual sludge anaerobic ammonia oxidation system, and at the same time realize the selective retention and discharge of sludge in the system. Attached Figure Description

[0031] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 A schematic diagram of a device for simultaneously achieving sludge sorting and dual sludge anaerobic ammonia oxidation.

[0033] Among them, 1-raw water tank, 11-first peristaltic pump, 2-anaerobic / aerobic tank, 21-first anaerobic tank, 211-first stirring device, 212-first inlet, 22-second anaerobic tank, 221-second stirring device, 23-first aerobic tank, 231-third stirring device, 232-first aeration disc, 233-first rotor flow meter, 24-second aerobic tank, 241-fourth stirring device, 242-second aeration disc, 243-second rotor flow meter, 244-first outlet, 25-air pump, 26-second peristaltic pump, 3-inclined plate separator. 31-Second inlet, 32-Second outlet, 33-Third outlet, 34-Inclined plate, 35-Third peristaltic pump, 36-Fourth peristaltic pump, 4-Activated sludge system, 41-Third inlet, 42-Fourth outlet, 43-First flow booster, 44-First three-phase separator, 45-First sludge discharge port, 46-First sludge discharge pipe, 5-Biofilm system, 51-Fourth inlet, 52-Fifth outlet, 53-Second flow booster, 54-Polyethylene plastic ring packing, 55-Second three-phase separator, 56-Second sludge discharge port, 57-Second sludge discharge pipe. Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0035] Example 1

[0036] This invention provides an apparatus and method for simultaneously achieving sludge sorting and dual anaerobic ammonium oxidation of sludge. The apparatus for simultaneously achieving sludge sorting and dual anaerobic ammonium oxidation of sludge is as follows: Figure 1As shown, based primarily on sludge particle size, an inclined plate separator is added after the aerobic tank, and the anoxic zone is divided into an activated sludge system and a biofilm system to achieve efficient removal of major pollutants such as total nitrogen and COD. This solves the problems of complex aeration control, high cost of treating and disposing of excess sludge, and poor effluent quality caused by sludge easily carried in the effluent during the AOA process.

[0037] The device for simultaneously achieving sludge sorting and dual sludge anaerobic ammonia oxidation includes: raw water tank 1, anaerobic / aerobic tank 2, inclined plate separator 3, activated sludge system 4, and biofilm system 5.

[0038] The raw water tank 1 includes: a first peristaltic pump 11;

[0039] The anaerobic / aerobic tank 2 includes: a first anaerobic tank 21, a first stirring device 211, a first inlet 212, a second anaerobic tank 22, a second stirring device 221, a first aerobic tank 23, a third stirring device 231, a first aeration disc 232, a first rotor flow meter 233, a second aerobic tank 24, a fourth stirring device 241, a second aeration disc 242, a second rotor flow meter 243, a first outlet 244, an air pump 25, and a second peristaltic pump 26.

[0040] The inclined plate separator 3 includes: a second inlet 31, a second outlet 32, a third outlet 33, an inclined plate 34, a third peristaltic pump 35, and a fourth peristaltic pump 36.

[0041] The activated sludge system 4 includes: a third inlet 41, a fourth outlet 42, a first flow booster 43, a first three-phase separator 44, a first sludge discharge outlet 45, and a first sludge discharge pipe 46.

[0042] The biofilm system 5 includes: a fourth inlet 51, a fifth outlet 52, a second flow promoter 53, a polyethylene plastic ring packing 54, a second three-phase separator 55, a second sludge discharge port 56, and a second sludge discharge pipe 57.

[0043] Wastewater flows from the raw water tank 1 through the first peristaltic pump 11 and the first inlet 212 into the first anaerobic tank 2 of the anaerobic / aerobic tank 2;

[0044] Meanwhile, a portion of the sludge at the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21;

[0045] Part of the mud-water mixture flows from the first anaerobic tank 21 into the second anaerobic tank 23, and then flows from the second anaerobic tank 23 through the first aerobic tank 23 and the second aerobic tank 24 in sequence. The dissolved oxygen concentration of the first aerobic tank 23 and the second aerobic tank 24 is controlled by the first rotor flowmeter 233 and the second rotor flowmeter 243 to a preset value.

[0046] The first anaerobic tank 21 is equipped with a first stirring device 211; the second anaerobic tank 22 is equipped with a second stirring device 221; the first aerobic tank 23 is equipped with a third stirring device 231; and the second aerobic tank 24 is equipped with a fourth stirring device 241. The first stirring device 211, the second stirring device 221, the third stirring device 231, and the fourth stirring device 241 are used for mechanical stirring to ensure that the activated sludge and wastewater are in a uniformly mixed state.

[0047] A first aeration disc 232 and a second aeration disc 242 are respectively provided in the first aerobic tank 23 and the second aerobic tank 24; the first aeration disc 232 and the second aeration disc 242 are used to provide oxygen with uniform distribution to the first aerobic tank 23 and the second aerobic tank 24 respectively.

[0048] Part of the mud-water mixture flows from the second aerobic tank 24 into the inclined plate separator 3 through the first outlet 244 and the second inlet 31. The mud-water mixture undergoes sludge sorting through the inclined plates 34 inside the inclined plate separator 3. Sludge with a particle size larger than a preset value is retained above the inclined plate 34, while sludge with a particle size less than or equal to the preset value is located below the inclined plate 34. Part of the mud-water mixture located above the inclined plate 34 enters the activated sludge system 4 through the inclined plate separator 3 via the second outlet 32, the third peristaltic pump 35, and the third inlet 41. Part of the mud-water mixture below the inclined plate 34 enters the biofilm system 5 through the inclined plate separator 3 via the third outlet 33, the fourth peristaltic pump 36, and the fourth inlet 51.

[0049] The supernatant of the activated sludge system 4 is discharged through the fourth outlet 42, and the gas escapes through the top of the first three-phase separator 44. Part of the sludge at the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21 through the first sludge discharge port 45 and the second peristaltic pump 26, and some remaining sludge is discharged through the first sludge discharge pipe 46. The supernatant of the biofilm system 5 is discharged through the fifth outlet 52, and the gas escapes through the top of the second three-phase separator 55. The sludge at the bottom of the biofilm system 5 is discharged through the second sludge discharge port 56 and the second sludge discharge pipe 57. The sludge entering the activated sludge system 4 and the biofilm system 5 undergoes denitrification through the activated sludge system 4 and the biofilm system 5, respectively.

[0050] The activated sludge system 4 and the biofilm system 5 further include a first flow mixer 43 and a second flow mixer 53; the first flow mixer 43 and the second flow mixer 53 are used to uniformly mix the activated sludge entering the activated sludge system 4 and the biofilm system 5 with the wastewater.

[0051] The method for simultaneously achieving sludge sorting and dual sludge anaerobic ammonia oxidation includes:

[0052] In this embodiment, sludge sorting and dual-sludge anaerobic ammonia oxidation are performed using domestic sewage from a reclaimed water plant in Beijing as an example. The concentrations of various pollutants in the domestic sewage from this reclaimed water plant are as follows: NH4 + -N concentration is 60-80 mg / L, NO2 - -N and NO3 - -N concentrations were all below 1 mg / L, and COD concentrations were 160–250 mg / L.

[0053] The inoculated sludge is activated sludge with short-cut nitrification capability. The sludge concentration in anaerobic / aerobic tank 2 is 4000-5000 mg / L, and the sludge concentration in activated sludge system 4 and biofilm system 5 is 4000-6000 mg / L.

[0054] The specific implementation process includes:

[0055] Wastewater enters the first anaerobic tank 21 from the raw water tank 1. At the same time, some sludge from the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21, and some sludge-water mixture flows from the first anaerobic tank 21 into the second anaerobic tank 22. In this embodiment, the hydraulic retention time of the first anaerobic tank 21 and the second anaerobic tank 22 is 2 to 3 hours. In the anaerobic tank, polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria mainly convert the COD in the wastewater into an internal carbon source and store it in the cells to support the denitrification process in the subsequent anoxic stage.

[0056] A portion of the sludge-water mixture flows sequentially from the second anaerobic tank 22 through the first aerobic tank 23 and the second aerobic tank 24. The dissolved oxygen concentration in the first aerobic tank 23 and the second aerobic tank 24 is controlled by the first rotor flowmeter 233 and the second rotor flowmeter 243, respectively. In this embodiment, the first rotor flowmeter 233 and the second rotor flowmeter 243 control the dissolved oxygen concentration in the first aerobic tank 23 and the second aerobic tank 24 to be 1.0–1.5 mg / L. The total hydraulic retention time in the first aerobic tank 23 and the second aerobic tank 24 is 3.5–4.5 h, mainly due to short-cut nitrification by short-cut nitrifying bacteria. NH4+ + -N is mostly oxidized to NO2. - -N, accompanied by a small amount of NO3. - -N is generated, controlling the NH4 at the first outlet. + -N concentration is 3-5 mg / L. The process mainly involves short-cut nitrification by nitrifying bacteria, which enriches AOB and inhibits NOB.

[0057] Part of the mud-water mixture flows into the inclined plate separator 3 from the second aerobic tank 24 through the first outlet 244 and the second inlet 31. The mud-water mixture is separated into sludge by the inclined plate 34 inside the inclined plate separator 3. In this embodiment, the particle size is set as the dividing point of 50μm. Sludge with a particle size > 50μm is trapped above the inclined plate 34, and sludge with a particle size < 50μm is located below the inclined plate. The liquid is uniformly mixed in the entire inclined plate separator.

[0058] The portion of the sludge-water mixture located above the inclined plate 34 enters the activated sludge system 4 via the inclined plate separator 3, containing larger sludge particles and NH4. + -N, NO2 - The persistent presence of -N provides the possibility for enrichment through anaerobic ammonia oxidation. In this embodiment, the hydraulic retention time of activated sludge system 4 is 4-6 hours, and nitrogen removal is mainly achieved through endogenous denitrification and anaerobic ammonia oxidation. A portion of the sludge-water mixture located below the inclined plate 34 enters the biofilm system 5 via the inclined plate separator 3. Polyethylene plastic ring packing 54 is added to the biofilm system 5, allowing small-particle activated sludge to adhere to the polyethylene plastic ring packing, while NH4+ is also absorbed. + -N, NO2 - The long-term coexistence of -N provides conditions for the enrichment and retention of anaerobic ammonia oxidizing bacteria on polyethylene plastic ring packing; in this embodiment, the hydraulic retention time of the biofilm system is 3-4 hours, and nitrogen removal is mainly achieved through anaerobic ammonia oxidation and endogenous denitrification.

[0059] The supernatant of the activated sludge system 4 is discharged through the fourth outlet 42, and the gas escapes through the top of the first three-phase separator 44. Part of the sludge at the bottom of the activated sludge system 4 is returned to the first anaerobic tank 21 through the first sludge discharge port 45 and the second peristaltic pump 26, and some remaining sludge is discharged through the first sludge discharge pipe 46. The supernatant of the biofilm system 5 is discharged through the fifth outlet 52, and the gas escapes through the top of the second three-phase separator 55. The sludge at the bottom of the biofilm system 5 is discharged through the second sludge discharge port 56 and the second sludge discharge pipe 57. In this embodiment, the sludge age is controlled to be 20–30 days.

[0060] In this embodiment, continuous test results show that during stable operation, the system's effluent NH4 content is [missing information]. + -N≤3mg / L, NO2 - -N≤0.5mg / L, NO3 - -N≤0.5mg / L, COD≤45mg / L, the effluent quality meets the national Class A discharge standard; please refer to Table 1 for details.

[0061] Table 1. Influent and Effluent Water Quality in Implementation Cases

[0062] System inlet / outlet water COD (mg / L) <![CDATA[NH4 + -N(mg / L)]]> <![CDATA[NO2 - -N(mg / L)]]> <![CDATA[NO3 - -N(mg / L)]]> Water ingress 160～250 60～80 ≤1 ≤1 Out of water ≤45 ≤3 ≤0.5 ≤0.5

[0063] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A device for simultaneous implementation of sludge separation and two-sludge anaerobic ammonia oxidation, characterized in that, The application relates to a sewage treatment device. The sewage treatment device comprises a raw water tank (1), an anaerobic / aerobic tank (2), an inclined plate separator (3), an activated sludge system (4) and a biofilm system (5). The anaerobic / aerobic tank (2) comprises a first anaerobic tank (21), a second anaerobic tank (22), a first aerobic tank (23) and a second aerobic tank (24). Sewage flows from the raw water tank (1) to the first anaerobic tank (21); meanwhile, part of sludge at the bottom of the activated sludge system (4) is backflowed to the first anaerobic tank (21); part of the sludge-water mixture flows from the first anaerobic tank (21) to the second anaerobic tank (22), and then sequentially flows through the first aerobic tank (23) and the second aerobic tank (24) from the second anaerobic tank (22); part of the sludge-water mixture flows from the second aerobic tank (24) to the inclined plate separator (3), sludge sorting is carried out on the sludge-water mixture through the inclined plate (34) in the inclined plate separator (3), sludge with a particle size greater than a preset value is intercepted above the inclined plate (34), and sludge with a particle size less than or equal to the preset value is below the inclined plate (34) through the inclined plate (34); part of the sludge-water mixture above the inclined plate (34) enters the activated sludge system (4); part of the sludge-water mixture below the inclined plate (34) enters the biofilm system (5), and denitrification is realized through the activated sludge system (4) and the biofilm system (5) respectively. Part of the sludge-water mixture above the inclined plate (34) enters the activated sludge system (4) through the second water outlet (32), the third peristaltic pump (35) and the third water inlet (41) of the inclined plate separator (3). Part of the sludge-water mixture below the inclined plate (34) enters the biofilm system (5) through the third water outlet (33), the fourth peristaltic pump (36) and the fourth water inlet (51) of the inclined plate separator (3). The supernatant of the activated sludge system (4) is discharged through the fourth water outlet (42), gas escapes through the top of the first three-phase separator (44), part of the sludge at the bottom of the activated sludge system (4) is backflowed to the first anaerobic tank (21) through the first sludge discharge port (45) and the second peristaltic pump (26), and part of the residual sludge is discharged through the first sludge discharge pipe (46). The supernatant of the biofilm system (5) is discharged through the fifth water outlet (52), gas escapes through the top of the second three-phase separator (55), and the sludge at the bottom of the biofilm system (5) is discharged through the second sludge discharge port (56) and the second sludge discharge pipe (57). The activated sludge system (4) and the biofilm system (5) further comprise a first pusher (43) and a second pusher (53); the activated sludge and the sewage entering the activated sludge system (4) and the biofilm system (5) are uniformly mixed by the first pusher (43) and the second pusher (53).

2. The apparatus for simultaneous implementation of sludge separation and dual-sludge ANAMMOX according to claim 1, wherein, The sewage flows from the raw water tank (1) to the first anaerobic tank (21) of the anaerobic / aerobic tank (2) through the first peristaltic pump (11) and the first water inlet (212).

3. The apparatus for simultaneous implementation of sludge separation and dual-sludge ANAMMOX according to claim 1, wherein, Part of the sludge-water mixture flows from the second anaerobic tank (22) to the first aerobic tank (23) and the second aerobic tank (24) in sequence, and the dissolved oxygen concentrations of the first aerobic tank (23) and the second aerobic tank (24) are controlled to be preset values by the first rotameter (233) and the second rotameter (243) respectively.

4. The apparatus for simultaneous implementation of sludge separation and dual-sludge ANAMMOX according to claim 1, wherein, The first anaerobic tank (21) is provided with a first stirring device (211); the second anaerobic tank (22) is provided with a second stirring device (221); the first aerobic tank (23) is provided with a third stirring device (231); the second aerobic tank (24) is provided with a fourth stirring device (241); the first stirring device (211), the second stirring device (221), the third stirring device (231) and the fourth stirring device (241) are used for mechanical stirring to make the activated sludge and the sewage in a uniform mixing state; The first aerobic tank (23) and the second aerobic tank (24) are respectively provided with a first aeration disc (232) and a second aeration disc (242); the first aeration disc (232) and the second aeration disc (242) are used for providing oxygen with uniform distribution to the first aerobic tank (23) and the second aerobic tank (24) respectively.

5. The apparatus for simultaneous implementation of sludge separation and dual-sludge ANAMMOX according to claim 1, wherein, Part of the sludge-water mixture flows from the second aerobic tank (24) to the inclined plate separator (3) through the first water outlet (244) and the second water inlet (31).

6. A method for simultaneous implementation of sludge separation and a two-sludge ANAMMOX process, characterized by, The device for simultaneously realizing sludge separation and double-sludge ANAMMOX according to any one of claims 1 to 5 realizes the following steps: Step S1: the sewage enters the first anaerobic tank from the raw water tank, and part of the sludge at the bottom of the activated sludge system is returned to the first anaerobic tank, and part of the sludge-water mixture flows from the first anaerobic tank to the second anaerobic tank; the hydraulic retention time of the first anaerobic tank and the second anaerobic tank is a preset time, and the phosphorus accumulating bacteria and the glycogen accumulating bacteria convert the COD in the sewage into an internal carbon source and store it in the body; Step S2: part of the sludge-water mixture flows from the second anaerobic tank to the first and second aerobic tanks in sequence, the dissolved oxygen concentrations of the first and second aerobic tanks are controlled by the first and second rotor flow meters respectively, the total hydraulic retention time of the first and second aerobic tanks is a preset value, the NH4 + -N concentration at the first water outlet is a preset value, short-cut nitrification is carried out by using nitrifying bacteria, AOB is enriched, and NOB is inhibited; Step S3: part of the sludge-water mixture flows from the second aerobic tank to the inclined plate separator through the first water outlet and the second water inlet, the sludge-water mixture is separated by the inclined plate in the inclined plate separator, the sludge with a particle size greater than a preset value is intercepted above the inclined plate, and the sludge with a particle size less than or equal to the preset value passes through the inclined plate and is located below the inclined plate, and the liquid is uniformly mixed in the entire inclined plate separator; Step S4: part of the sludge-water mixture located above the inclined plate enters the activated sludge system, the hydraulic retention time of the activated sludge system is a preset value, and denitrification is realized through endogenous denitrification and ANAMMOX; Step S5: part of the sludge-water mixture located below the inclined plate enters the biofilm system, polyethylene plastic ring fillers are added to the biofilm system, the hydraulic retention time of the biofilm system is a preset value, and denitrification is realized through ANAMMOX and endogenous denitrification; Step S6: the supernatant of the activated sludge system is discharged through the fourth water outlet, the gas escapes through the top of the first three-phase separator, and part of the residual sludge is discharged through the first sludge discharge pipe; the supernatant of the biofilm system is discharged through the fifth water outlet, the gas escapes through the top of the second three-phase separator, and the sludge at the bottom of the biofilm system is discharged through the second sludge discharge pipe.

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