Advanced treatment system for high-concentration nitrogenous organic wastewater

Abstract

The utility model discloses an advanced treatment system for high-concentration nitrogen-containing organic wastewater, which sequentially comprises an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a sulfur autotrophic denitrification filter tank and a limestone filter tank, a water passing hole is formed in the upper part of a wall body between the anaerobic tank and the anoxic tank, a hollow aeration fiber membrane assembly is arranged in the anoxic tank, an aeration pipe is arranged at the bottom of the aerobic tank, a mixed liquid reflux pump is arranged at the bottom of the aerobic tank in a penetrating manner and is connected with the anoxic tank through a pipeline, and the aeration pipe is connected with the anoxic tank through a pipeline. A sludge reflux pump penetrates through the bottom of the secondary sedimentation tank and is connected with the anaerobic tank through a pipeline. Iron-carbon micro-electrolysis is intervened in the anaerobic reactor to achieve the purposes of improving the biodegradability of high-concentration degradation-resistant wastewater and enhancing biochemical treatment, and the nitrogen removal mode of anaerobic section MABR bubble-free aeration synchronous nitrification and denitrification is organically combined, so that the treatment load of the system and the utilization rate of activated sludge are improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a deep treatment system for high-concentration nitrogen-containing organic wastewater. Background Technology

[0002] Microorganisms play a crucial role in wastewater treatment, removing organic matter through biodegradation. However, high concentrations of chemicals in wastewater can inhibit the growth and reproduction of microorganisms. Even well-adapted microorganisms can only handle relatively low concentrations of pollutants. When the concentration of chemicals in wastewater exceeds a certain level, not only will the activity of microorganisms be inhibited, leading to a decrease in COD removal rate, but it can also cause sludge volume expansion, a large amount of foam on the water surface, and the subsequent death of microorganisms.

[0003] Currently, for the treatment of high nitrogen concentration wastewater, the biological stage usually adopts a two-stage A / O process to achieve deep denitrification. However, the energy consumption of aeration and sludge treatment accounts for more than 60% of the energy consumption of wastewater treatment plant operation. The demand for organic carbon sources is high and the reactor occupies a large area. In addition, the microbial growth and metabolic enzyme activity are low, resulting in unsatisfactory pollutant removal and high treatment costs. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-concentration nitrogen-containing organic wastewater deep treatment system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-concentration nitrogen-containing organic wastewater deep treatment system, comprising, in sequence, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a sulfur autotrophic denitrification filter, and a limestone filter. Iron-carbon micro-electrolysis suspended balls are placed in the anaerobic tank. Water passage holes are provided above the wall between the anaerobic and anoxic tanks. Hollow fiber aeration membrane modules are installed in the anoxic tank. An aeration pipe is installed at the bottom of the aerobic tank. A mixed liquor return pump is installed through the bottom of the aerobic tank and connected to the anoxic tank via a pipeline. A sludge return pump is installed through the bottom of the secondary sedimentation tank and connected to the anaerobic tank via a pipeline.

[0007] Preferably, a stirrer is installed in the anaerobic tank to agitate the iron-carbon micro-electrolysis suspension balls. The carbon micro-electrolysis suspension balls act as a conductive carrier and simultaneously stimulate the secretion of extracellular polymers by microorganisms in the sludge. The iron-carbon micro-electrolysis suspension balls use biochar as the active iron support, with an iron-carbon mass ratio of 1:1. After high-temperature sintering, the carrier has a spherical hollow structure with an outer diameter of 6-8 cm and an inner diameter ≤5 cm, exhibiting good mechanical strength and remaining fluid in the water. This improves the problem of passivation and caking of iron-carbon packing materials. The balls are wrapped with a protective mesh to prevent the packing material from breaking and clogging the pipes due to fluid agitation.

[0008] Preferably, a submersible propeller is installed on the wall between the anaerobic tank and the anoxic tank, and inside the anoxic tank.

[0009] Preferably, a plurality of microporous aeration discs are provided above the aeration pipe.

[0010] Preferably, the hollow fiber membrane module uses polyvinylidene fluoride (PVDF) membrane filaments with an outer diameter of 400-600 μm, an effective length of 1.5 m, and a membrane area packing density of 80-150 m² / g. 2 / m 3 .

[0011] Preferably, a residual sludge discharge pipe is provided at the bottom of the secondary sedimentation tank, and a sewage lift pump is provided at the top of the secondary sedimentation tank. The sewage lift pump is connected to the bottom of the sulfur autotrophic denitrification filter through a pipeline.

[0012] Preferably, the sulfur autotrophic denitrification filter is configured from bottom to top as a gravel support layer, a composite filter media layer, and a water collection layer. The composite filter media layer is composed of sulfur, pyrite, and siderite in a ratio of (6-9):3:1, with a bulk density of 1.15 t / m³. 3 Particle size 4-6mm, filter media filling height 2-4.5m.

[0013] Preferably, the top of the sulfur autotrophic denitrification filter is connected to the top of the limestone filter via a pipe, and the bottom of the limestone filter is provided with an outlet; the limestone filter is provided with a support layer and a packing layer from bottom to top, the support layer is filled with gravel with a particle size of 45-50mm, and the packing layer is filled with limestone particles with a particle size of 20-25mm.

[0014] Preferably, the anoxic tank and the aerobic tank are connected by a variable frequency fan via a pipeline. The pipeline connecting the variable frequency fan to the hollow fiber membrane module in the anoxic tank is equipped with a fiber membrane air intake regulating valve, and the pipeline connecting the variable frequency fan to the aerobic tank is equipped with an aeration pipe regulating valve.

[0015] Fe in iron-carbon micro-electrolysis suspension spheres 0 Hydrogen evolution corrosion easily occurs in anaerobic environments, and Fe is released during anodic corrosion. 2+It can enhance the metabolic activity of microorganisms, and the H2 released from the cathode can provide more substrate for methanogens. Fe 0 The iron-carbon micro-electrolysis filler forms a micro-galvanic cell with carbon to degrade organic matter in wastewater. When the iron-carbon micro-electrolysis filler is mixed with wastewater, electron transfer can effectively stimulate the growth of microorganisms and the activity of metabolic enzymes, and further improve the biodegradation capacity of microorganisms, thereby enhancing the purpose of biological treatment and improving the sustainability and economy of anaerobic technology. Iron-carbon micro-electrolysis enhances the microbial treatment performance of anaerobic ponds.

[0016] Hollow fiber membrane modules belong to the category of membrane aerated bioreactors (MABRs). As a bubble-free aeration technology, MABRs organically combine traditional biofilm methods with aeration membrane technology. The hollow fiber membrane in the MABR tank has an excellent oxygen transfer rate, serving as a carrier for microbial attachment and providing bubble-free aeration for the biofilm. Driven by an oxygen concentration gradient, oxygen dissolves and diffuses within the membrane, gradually transitioning from the aerobic zone to the anaerobic layer. This creates a completely opposite oxygen transfer direction to the biofilm, ensuring simultaneous nitrification and denitrification in the anoxic tank, achieving economical and efficient nitrogen removal. Simultaneously, MABRs exhibit good removal efficiency for recalcitrant and volatile pollutants such as acetonitrile, formaldehyde, and phenols, playing a significant role in treating volatile organic compounds and recalcitrant organic wastewater. MABRs also possess good microbial adhesion, improving biological nitrogen removal efficiency.

[0017] The sulfur autotrophic denitrification filter is configured from bottom to top with a gravel support layer, a composite filter media layer, and a water collection layer. This sulfur autotrophic denitrification process, which eliminates the need for an external organic carbon source, alleviates this contradiction. Sulfur autotrophic denitrification boasts high nitrogen removal efficiency, low energy consumption, and low sludge production, showing promising application prospects in biological nitrogen removal. It is suitable for deep end-of-pipe nitrogen removal, ensuring nitrogen removal rate while reducing operating costs and sludge generation. This system features enhanced nitrogen and carbon removal, strong resistance to load shocks, and space-saving design. This invention is suitable for the deep treatment of high-concentration organic wastewater with a low C / N ratio.

[0018] The advantages of this utility model over the prior art are:

[0019] 1. This invention improves the biodegradability and enhances the biological treatment of high-concentration, recalcitrant wastewater by introducing iron-carbon micro-electrolysis into an anaerobic reactor. It organically combines this with a MABR (Maintenance, Bioreactor, and Reactor) system in the anoxic zone, employing non-foaming aeration and simultaneous nitrification and denitrification to increase the system's treatment load and activated sludge utilization rate. Compared to traditional two-stage A / O processes, this treatment system saves on equipment footprint and energy costs while ensuring efficient nitrogen and carbon removal. Utilizing pumps and return pipes, wastewater can circulate between reaction tanks, improving wastewater purification efficiency.

[0020] 2. This invention utilizes sulfur autotrophic denitrification for deep end-of-pipe denitrification treatment of wastewater. It eliminates the need for additional organic carbon sources, preventing residual organic matter from causing biological pollution in the effluent. The sulfur-iron composite packing material within the tank promotes the formation of a multiphase denitrification reaction hot zone, accelerating the denitrification rate and maintaining system pH stability. Compared to heterotrophic denitrification tanks, operating costs are reduced by nearly 50%, and the TN removal rate reaches over 95% when the influent TN is below 150 mg / L. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the high-concentration nitrogen-containing organic wastewater deep treatment system of this utility model.

[0022] The attached diagram is labeled as follows: 1. Anaerobic tank; 11. Iron-carbon micro-electrolysis suspended ball; 12. Agitator; 2. Anoxic tank; 21. Hollow fiber membrane module; 22. Submersible jet mixer; 3. Aerobic tank; 31. Aeration pipe; 32. Microporous aeration disc; 4. Secondary sedimentation tank; 41. Excess sludge discharge pipe; 42. Wastewater lift pump; 43. Sludge return pump; 5. Sulfate autotrophic denitrification filter; 6. Variable frequency blower; 7. Aeration pipe air volume regulating valve; 71. Fiber membrane air intake regulating valve; 8. Mixed liquor return pump; 9. Limestone filter; 91. Outlet; 10. Water passage hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] A high-concentration nitrogen-containing organic wastewater deep treatment system includes, in sequence, an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a secondary sedimentation tank 4, a sulfur autotrophic denitrification filter 5, and a limestone filter 9. Iron-carbon micro-electrolysis suspended balls 11 are placed in the anaerobic tank 1. Water passage holes 10 are provided above the wall between the anaerobic tank 1 and the anoxic tank 2. Hollow fiber aeration membrane modules 21 are installed in the anoxic tank 2. An aeration pipe 3 is installed at the bottom of the aerobic tank 3. A mixed liquor return pump 8 is installed through the bottom of the aerobic tank 3 and connected to the anoxic tank 2 via a pipeline. A sludge return pump 43 is installed through the bottom of the secondary sedimentation tank 4 and connected to the anaerobic tank 1 via a pipeline.

[0025] In one embodiment, a stirrer 12 is installed in the anaerobic tank 1 to stir the iron-carbon micro-electrolysis suspension ball 11. The iron-carbon micro-electrolysis suspension ball 11 uses biochar as the active iron support, with an iron-carbon mass ratio of 1:1. After high-temperature sintering, the carrier has a spherical cavity structure with an outer diameter of 6-8 cm and an inner diameter of ≤5 cm.

[0026] In one embodiment, a submersible thruster 22 is installed on the wall between the anaerobic pool 1 and the anoxic pool 2 and inside the anoxic pool 2.

[0027] In one embodiment, a plurality of microporous aeration discs 32 are provided above the aeration pipe 31.

[0028] In one embodiment, the hollow fiber membrane module 21 uses polyvinylidene fluoride (PVDF) as the membrane material, with an outer diameter of 400-600 μm, an effective length of 1.5 m, and a membrane area packing density of 80-150 m² / g. 2 / m 3 .

[0029] In one embodiment, a residual sludge discharge pipe 41 is provided at the bottom of the secondary sedimentation tank 4, and a sewage lift pump 42 is provided at the top of the secondary sedimentation tank 4. The sewage lift pump 42 is connected to the bottom of the sulfur autotrophic denitrification filter 5 through a pipeline.

[0030] In one embodiment, the sulfur autotrophic denitrification filter 5 is configured from bottom to top as a gravel support layer, a composite filter media layer, and a water collection layer. The composite filter media layer is composed of sulfur, pyrite, and siderite in a ratio of (6-9):3:1, with a bulk density of 1.15 t / m³. 3 Particle size 4-6mm, filter media filling height 2-4.5m.

[0031] In one embodiment, the top of the sulfur autotrophic denitrification filter 5 is connected to the top of the limestone filter 9 via a pipe, and the bottom of the limestone filter 9 is provided with an outlet 91; the limestone filter 9 is provided with a support layer and a packing layer from bottom to top, the support layer is filled with gravel with a particle size of 45-50mm, and the packing layer is filled with limestone particles with a particle size of 20-25mm.

[0032] In one embodiment, the anoxic tank 2 and the aerobic tank 3 are connected by a variable frequency fan 6 through a pipeline. The pipeline connecting the variable frequency fan 6 to the hollow aeration fiber membrane module 21 in the anoxic tank 2 is equipped with a fiber membrane air intake regulating valve 71, and the pipeline connecting the variable frequency fan 6 to the aerobic tank 3 is equipped with an aeration pipe regulating valve 7.

[0033] A method for advanced treatment of high-concentration nitrogen-containing organic wastewater includes the following steps:

[0034] (1) First, the wastewater flows into the anaerobic tank 1, and the stirrer 12 is started to make the tank body flow. Under the enhanced effect of electrolysis by the stirred iron-carbon micro-electrolysis suspension balls 11, the microorganisms efficiently degrade organic pollutants. 0 Biochar forms countless micro-galvanic cells in the anaerobic tank, accelerating electron transfer, reducing the redox potential of the system, and improving the conversion rate of organic matter and the biodegradability of wastewater.

[0035] (2) The effluent from the anaerobic tank 1 flows into the anoxic tank 2 through the water passage 10. The hollow aeration fiber membrane module 21 forms a thick biofilm after acclimation for 14 days through continuous flow of wastewater to start the device. The aeration pressure is controlled at 0.05-0.15 MPa and the DO is controlled at 0.5 mg / L. Oxygen and pollutants enter the membrane from both sides. The aerobic layer of the biofilm undergoes nitrification to oxidize and decompose organic carbon, while the anaerobic layer of the biofilm in contact with the wastewater undergoes denitrification.

[0036] (3) The effluent from the anoxic tank 2 is fed into the aerobic tank 3. The microporous aeration disc 32 installed above the bottom aeration pipe 31 controls the DO at 2-3 mg / L to further decompose organic matter. A mixed liquor return pump 8 is installed at the bottom to feed into the anoxic tank 2, with a return ratio of 200-400%.

[0037] (4) The effluent from the aerobic tank 3 enters the secondary sedimentation tank 4 through the pipeline for mud-water separation. The bottom part of the sludge is fed into the anaerobic tank 1 through the sludge return pump 43. The remaining sludge is discharged through the bottom remaining sludge discharge pipe 41. The effluent from the upper clarification zone flows through the overflow port and enters the sulfur autotrophic denitrification filter 5 through the sewage lifting pump 42.

[0038] (5) Before starting the sulfur autotrophic denitrification filter 5, inoculate it with biofilm and continuously pass wastewater through it for 20 days to acclimate it. When a biofilm forms on the surface of the filter media, start the device. The effluent from the secondary sedimentation tank 4 is fed into the packing layer of the sulfur autotrophic denitrification filter 5 by the sewage lift pump 42. The pH of the influent is controlled at 7-7.5. The denitrifying bacteria utilize S 0 and S 2- The autotrophic denitrification process removes most of the NO3 from the effluent of the secondary sedimentation tank. - -N is converted to N2, and the reaction process produces H2. + Promotes the Fe in siderite 2+ Leaching, Fe 2+ It can also drive a small portion of NO3 as an auxiliary electron donor. - -N is converted to N2, extending the reaction zone of microorganisms on FeCO3 from the solid phase to the solid-liquid phase. Simultaneously, CO3... 2- It can be used as a pH buffer while continuously providing an inorganic carbon source to ensure the growth and metabolism needs of microorganisms in the wastewater treatment system; the effluent from the sulfur autotrophic denitrification filter 5 is collected in the upper water collection layer of the reactor and discharged.

[0039] (6) The effluent from the sulfur autotrophic denitrification filter 5 flows into the limestone filter 9. The water flows from top to bottom. Under the action of the granular limestone in the packing layer, the sulfate produced by the sulfur autotrophic denitrification process is removed. A gravel layer is laid at the bottom, and the effluent finally meets the discharge standards.

[0040] In the embodiments, as shown in the appendix Figure 1 The high-concentration nitrogen-containing organic wastewater deep treatment system shown mainly consists of an anaerobic tank 1, an anoxic tank 2, a hollow fiber membrane module 21, an aerobic tank 3, a secondary sedimentation tank 4, a sulfur autotrophic denitrification filter 5, and a limestone filter 9. The wastewater is transported and treated sequentially by several inlet and outlet pipes and wastewater pumps in the direction of water flow. The effluent mixture from the aerobic tank 3 is transported to the anoxic tank 2 via a mixed liquor return pump 8, with a return ratio set at 300%. Sludge from the secondary sedimentation tank 4 enters both the anoxic tank 2 and the aerobic tank 3 via a sludge return pump 43. Excess sludge is discharged through a discharge pipe 41. An agitator 12 is installed in the anaerobic tank 1 to keep the mixed liquor in a flowing state, and a submersible jet mixer 22 is installed in the anoxic tank 2 for mixing and low-speed propulsion.

[0041] A variable frequency blower 6 is installed, which controls the air volume regulating valve 7 of the aeration pipe to introduce air into the microporous aeration discs 32, and controls the air volume regulating valve 71 of the aeration membrane to introduce air into the hollow fiber aeration membrane module 21. The effluent from the anoxic tank 2 flows into the aerobic tank 3 for aerobic biological treatment. The variable frequency blower 6 is connected to the aeration pipe 31 and is installed around the bottom of the aerobic tank 2. The microporous aeration discs 32 are evenly distributed on the aeration pipe 31 to aerate the aerobic organisms. The dissolved oxygen (DO) in the hollow fiber aeration membrane module is 0.5 mg / L, and the microporous aeration discs 32 control the DO at 2-3 mg / L.

[0042] The effluent from the clarification zone of the secondary sedimentation tank 4 enters the sulfur autotrophic denitrification filter 5 via sewage lift pump 42. The filter media layer is filled with sulfur-iron composite packing material, and the packing height is 2m. The limestone filter 9 has a packing layer filled with granular limestone with a particle size of 20-25mm, and the packing layer height is 1m.

[0043] Example 1

[0044] The influent COD of a landfill leachate treatment plant in the later stages is 5300-5500 mg / L, TN is 1625-1700 mg / L, and NH4+ is... + -N is 1000-1230 mg / L, BOD5 / COD = 0.1-0.15.

[0045] Wastewater enters anaerobic tank 1 for TCOD biodegradation. Anaerobic digestive bacteria fully react with iron-carbon micro-electrolysis suspension balls 11, decomposing recalcitrant organic matter in the leachate into small-molecule biodegradable carbon sources. Iron cycling stabilizes the anaerobic digestion process. The porous nature of the balls facilitates loading by anaerobic bacteria. 0Lowering the system's redox potential significantly improves the conversion of organic matter into methane and volatile fatty acids, increasing methane production by 30%-40%. Anaerobic tank 1 is equipped with a uniformly moving stirrer 12 to accelerate the mixing and contact of the fluid and suspended carrier, improving biodegradability and facilitating subsequent biological treatment. The effluent from anaerobic tank 1 enters an anoxic tank 2, which is equipped with a hollow fiber aeration membrane module 21. The aeration pressure is controlled at 0.1 MPa, and DO is controlled at 0.5 mg / L. Oxygen permeates from the inner cavity of the hollow fiber aeration membrane to the outside, reducing NH4+ in the wastewater. + -N diffuses into the bottom layer of the biofilm, and nitrifying bacteria grow densely on the surface of the hollow fiber aerated membrane, maintaining a high nitrification rate. The outer layer of the biofilm provides an anoxic environment suitable for the growth and proliferation of denitrifying bacteria, thus facilitating denitrification. Simultaneous nitrification and denitrification occur on the biofilm, achieving a COD removal rate of 95% and a TN removal rate of 84%. The effluent from the anoxic tank 2 enters the aerobic tank 3, where DO is controlled to 2 mg / L through the bottom aeration pipe 31 and microporous aeration discs 32. In the aerobic tank 3, the wastewater undergoes organic matter degradation and nitrification, removing the remaining NH4+. + -N is converted to NO3 — N, NH4 + -N removal rate reaches 89%. The effluent from aerobic tank 3 flows through the overflow into secondary sedimentation tank 4 for sludge-water separation. The concentrated sludge is pumped back to anaerobic tank 1 and aerobic tank 2 via sludge return pump 43. The effluent from the upper clarification zone flows through wastewater lift pump 42 into sulfur autotrophic denitrification filter 5. After biofilm acclimation, autotrophic denitrifying bacteria accumulate in the packing layer, utilizing CO32... 2- As an inorganic carbon source, S 0 and S 2- As an electron donor, with NO3 — Nitrogen acts as the electron acceptor, undergoing autotrophic denitrification, which converts most of the NO3- into nitrogen. — Nitrogen (N) is reduced to nitrogen (N2), with a hydraulic retention time of 8 hours and pH controlled between 7 and 7.5. The effluent from the sulfur-autotrophic denitrification filter 5 flows into the collection layer. The COD concentration in the effluent from the biological treatment system is less than 300 mg / L, and the NH4+ concentration is... + -N concentration less than 10 mg / L, effluent NO3 - The TN concentration is less than 15 mg / L, and the average TN removal rate is consistently above 95%. The effluent from the sulfur autotrophic denitrification filter 5 flows into the limestone filter 9 for sulfate removal, and the final effluent is discharged through the bottom outlet 91 of the filter, meeting the discharge standards.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high concentration nitrogen-containing organic wastewater advanced treatment system, characterized in that, The treatment system sequentially comprises an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), a secondary sedimentation tank (4), a sulfur autotrophic denitrification filter tank (5) and a limestone filter tank (9), iron-carbon micro-electrolysis suspended balls (11) are placed in the anaerobic tank (1), a water passing hole (10) is arranged above the wall between the anaerobic tank (1) and the anoxic tank (2), a hollow aeration fiber membrane assembly (21) is arranged in the anoxic tank (2), an aeration pipe (31) is arranged at the bottom of the aerobic tank (3), a mixed liquid backflow pump (8) is arranged through the bottom of the aerobic tank (3) and connected with the anoxic tank (2) through a pipeline, and a sludge backflow pump (43) is arranged through the bottom of the secondary sedimentation tank (4) and connected with the anaerobic tank (1) through a pipeline.

2. The high-concentration nitrogen-containing organic wastewater advanced treatment system according to claim 1, characterized in that, A stirrer (12) is arranged in the anaerobic tank (1) for stirring the iron-carbon micro-electrolysis suspended balls (11), the iron-carbon micro-electrolysis suspended balls (11) take biochar as an active iron carrier, the carrier has a spherical cavity structure, the outer diameter is 6-8 cm, and the inner diameter is ≤5 cm.

3. The system for advanced treatment of high-concentration nitrogen-containing organic wastewater according to claim 1, characterized in that, A submersible flow inducer (22) is arranged on the wall between the anaerobic tank (1) and the anoxic tank (2) and in the anoxic tank (2).

4. The system for advanced treatment of high-concentration nitrogen-containing organic wastewater according to claim 1, characterized in that, A plurality of microporous aeration discs (32) are arranged above the aeration pipe (31).

5. The system for advanced treatment of high-strength nitrogenous organic wastewater according to claim 1, characterized in that, A residual sludge discharge pipe (41) is arranged at the bottom of the secondary sedimentation tank (4), a sewage lifting pump (42) is arranged at the top of the secondary sedimentation tank (4), and the sewage lifting pump (42) is communicated with the bottom of the sulfur autotrophic denitrification filter tank (5) through a pipeline.

6. The high concentration nitrogen-containing organic wastewater advanced treatment system according to claim 5, characterized in that, The sulfur autotrophic denitrification filter tank (5) is provided with a gravel supporting layer, a composite filter material filling layer and a water collecting layer from bottom to top.

7. The system for advanced treatment of high-strength nitrogenous organic wastewater according to claim 1, characterized in that, The top of the sulfur autotrophic denitrification filter tank (5) is connected with the top of the limestone filter tank (9) through a pipeline, the bottom of the limestone filter tank (9) is provided with a water outlet (91), the limestone filter tank (9) is provided with a supporting layer and a filling layer from bottom to top, the supporting layer is filled with gravel with a particle size of 45-50 mm, and the filling layer is filled with granular limestone with a particle size of 20-25 mm.

8. The system for advanced treatment of high-strength nitrogenous organic wastewater according to claim 1, characterized in that, The anoxic tank (2) and the aerobic tank (3) are provided with a variable frequency fan (6) through a pipeline, a fiber membrane air inlet amount adjusting valve (71) is arranged on the pipeline connected with the hollow aeration fiber membrane assembly (21) in the anoxic tank (2), and an aeration pipe adjusting valve (7) is arranged on the pipeline connected with the aerobic tank (3).

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