Synchronous nitrogen and phosphorus removal integrated system for sewage with low carbon nitrogen ratio

Abstract

The utility model discloses a synchronous nitrogen and phosphorus removal integrated system for sewage with a low carbon nitrogen ratio. Along with strict execution of an environmental protection supervision system, sewage treatment discharge standards of various regions are increasingly strict. The device is sequentially provided with the following areas: an anaerobic tank, a 1 # front anoxic tank, a 1 # rear anoxic tank, a 1 # aerobic tank, a 2 # anoxic tank, a 2 # aerobic tank, a 3 # anoxic tank, a 3 # aerobic tank, a secondary sedimentation tank, a flocculation tank, a denitrification deep bed filter tank and a water outlet area, an aerator is arranged at the bottom of the aerobic tank; the anaerobic tank is connected with the 1 # rear anoxic tank through a mixed liquid return pipe, and a return pump is arranged on the mixed liquid return pipe; a sludge return pipe and a residual sludge discharge pipe are arranged at the bottom of the secondary sedimentation tank; the sludge return pipe is connected with the 1 # front anoxic tank; sewage inlet pipes are respectively arranged at the tops of the No.1 front anoxic tank, the No.2 anoxic tank and the No.3 anoxic tank. According to the utility model, a water inlet carbon source is reasonably distributed by adopting a segmented water inlet mode, and the effluent quality reaches the standard under the condition of low C / N ratio.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio. Background Technology

[0002] With rapid economic development and accelerated urbanization, residential water consumption and sewage discharge have continued to rise. However, constrained by urban land scarcity and ecological red lines, the growth rate of newly built sewage treatment plants has slowed significantly. From 2019 to 2022, the number of newly built urban sewage treatment plants nationwide were 2,471, 2,618, 2,827, and 2,894, respectively. The traditional activated sludge process faces the dual challenges of large land area and limited volumetric load, making it difficult to meet the continuously growing demand for sewage treatment.

[0003] Organic pollutants, nitrogen, and phosphorus, represented by chemical oxygen demand (COD), are the main components of domestic sewage. Discharge of substandard pollutants into natural water bodies can cause serious harm to the natural ecosystem and human health. With the strict enforcement of environmental protection inspection systems, sewage treatment and discharge standards across the country are becoming increasingly stringent. Many cities have formulated local standards based on the Class A standard of the "Discharge Standard of Pollutants for Urban Wastewater Treatment Plants" (GB18918-2002), requiring key indicators to reach "quasi-Class IV and quasi-Class III surface water standards," etc.

[0004] With A 2 Traditional activated sludge processes, represented by the 0 process, can simultaneously achieve nitrogen and phosphorus removal. The main process flow is: influent—anaerobic tank—anoxic tank—aerobic tank—secondary sedimentation tank—effluent. Sludge from the secondary sedimentation tank is returned to the anaerobic tank, and nitrified liquor from the aerobic tank is returned to the anoxic tank to provide NO3. - It is used for denitrification. However, the following problems exist during operation:

[0005] 1) When sludge from the secondary sedimentation tank is returned to the anaerobic tank, the nitrates in the sludge will affect the anaerobic phosphorus release process of polyphosphate-accumulating bacteria and hinder the anaerobic phosphorus release process.

[0006] 2) The intense competition for carbon sources between polyphosphate-accumulating bacteria and denitrifying bacteria in the anaerobic stage, coupled with the fact that the influent water quality of urban wastewater treatment plants, especially in southern my country, generally exhibits a low C / N ratio, further increases the difficulty of biological nitrogen and phosphorus removal. How to achieve total nitrogen discharge compliance without adding carbon sources and operating at high load has become the main challenge. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, this utility model provides an integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio. The mixed liquor returned to the anaerobic tank has a low nitrate concentration, which avoids the impact of nitrate on the anaerobic phosphorus release process of polyphosphate-accumulating bacteria and promotes the anaerobic phosphorus release process. By arranging the three sections alternately in anoxic / aerobic, the carbon source in the influent is reasonably distributed through a segmented water intake method, ensuring that the effluent meets the discharge standards under low C / N ratio conditions.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An integrated system for simultaneous nitrogen and phosphorus removal from low carbon-to-nitrogen ratio wastewater based on MBBR technology, comprising the following zones arranged sequentially from front to back:

[0010] The anaerobic tank A1, the pre-anoxic tank A2-1, the post-anoxic tank A2-2, the aerobic tank A3, the anoxic tank A4, the aerobic tank A5, the anoxic tank A6, the aerobic tank A7, the secondary sedimentation tank A8, the flocculation tank A9, the denitrification deep bed filter A10, and the effluent zone A11 are all connected by partition walls. The different areas are separated by partition walls with connecting openings, and adjacent areas are connected through these openings.

[0011] Aerobic tank A3 (1#), aerobic tank A5 (2#), and aerobic tank A7 (3#) are equipped with aerobic tank tubular microporous aerators C1 at the bottom.

[0012] The bottom of the anaerobic tank A1 is connected to the bottom of the No. 1 post-anoxic tank A2-2 via the mixed liquor return pipe G7, and the mixed liquor return pump B2 is installed on the mixed liquor return pipe G7.

[0013] The bottom of the secondary sedimentation tank A8 is equipped with a sludge return pipe G8 and a residual sludge discharge pipe G9. The sludge return pipe G8 is connected to the pre-anoxic tank A2-1 of No. 1. A sludge return pump B3 is installed on the sludge return pipe G8.

[0014] The tops of the pre-anoxic tank A2-1, anoxic tank A4, and anoxic tank A6 are respectively equipped with wastewater inlet pipes G1, G2, and G3 for anoxic tank A2-1, G2, and G3. These pipes are connected to wastewater inlet pump B1, and the wastewater to be treated is pumped in by the wastewater inlet pump B1.

[0015] Furthermore, an anaerobic tank agitator J2 is installed at the bottom of the anaerobic tank A1, an anoxic tank agitator J1 is installed at the bottom of the pre-anoxic tank A2-1, the post-anoxic tank A2-2, the anoxic tank A4, and the anoxic tank A6, and a rapid flocculation tank agitator J3 is installed at the bottom of the flocculation tank A9.

[0016] Furthermore, aerobic tank suspended packing material X1 is added to the aerobic tanks A3 (1#), A5 (2#), and A7 (3#).

[0017] Furthermore, the aerobic tank tubular microporous aerators C1 at the bottom of aerobic tanks A3, A5, and A7 are respectively connected to the outlet end of the aerobic tank aeration blower F1 through aeration inlet pipes G4, G5, and G6 of aerobic tanks A3 and A7.

[0018] Furthermore, an aerobic tank tubular microporous aerator C1 is provided at the bottom with an aerobic tank tubular microporous aerator pipe clamp bracket E1.

[0019] Furthermore, packing interception nets are installed at the connection points of the walls of the No. 1 aerobic tank A3, No. 2 aerobic tank A5, and No. 3 aerobic tank A7.

[0020] Furthermore, a flocculation tank dosing pipe G10 is installed inside the flocculation tank A9.

[0021] Furthermore, the denitrification deep bed filter A10 is equipped with a denitrification filter dosing pipe G11, and from top to bottom, it is respectively equipped with a water distribution zone, a denitrification filter quartz sand packing layer X2, a denitrification filter pebble support layer X3, and a denitrification filter plate and filter brick X4.

[0022] Furthermore, the bottom of the denitrification deep bed filter A10 is provided with a denitrification filter backwash air inlet pipe G12 and a denitrification filter backwash water inlet pipe G13;

[0023] The backwash air inlet pipe G12 of the denitrification filter is connected to the air washing blower F2 of the denitrification filter;

[0024] The backwash inlet pipe G13 of the denitrification filter is connected to the outlet of the backwash inlet pump B4 of the denitrification filter, and the inlet of the backwash inlet pump B4 of the denitrification filter is connected to the outlet pipe G14 of the outlet zone A11.

[0025] The beneficial effects of this utility model are:

[0026] 1) This utility model divides the anoxic tank in the initial process into two ends, front and rear. A sludge return pipe is set between the No. 1 front anoxic tank and the secondary sedimentation tank, and a mixed liquor return pipe is set between the No. 1 rear anoxic tank and the anaerobic tank. After the returned sludge undergoes sufficient denitrification in the front and rear anoxic tanks, the nitrates contained in the returned sludge are effectively removed, thereby ensuring that the nitrate concentration in the mixed liquor returned to the anaerobic tank is low. This greatly avoids the impact of nitrates on the anaerobic phosphorus release process of polyphosphate-accumulating bacteria and promotes the anaerobic phosphorus release process.

[0027] 2) This invention utilizes a three-stage alternating arrangement of anoxic / aerobic zones and a segmented water intake method to rationally distribute the influent carbon source. The nitrified liquid produced in the aerobic zone directly enters the next anoxic zone to utilize the carbon source in the raw water for denitrification, breaking through the carbon source limitations of traditional processes and achieving full utilization of the raw water carbon source, thus efficiently removing nitrogen and phosphorus from wastewater with a low C / N ratio. Simultaneously, it eliminates the need for traditional A... 2 The internal reflux facility for nitrified liquid in the O process saves operating energy consumption;

[0028] 3) This utility model fills the aerobic zone with suspended packing material, which plays a role in biofilm enrichment. It achieves the partitioned enrichment and synergistic effect of functional bacteria (nitrifying / denitrifying bacteria, polyphosphate-accumulating bacteria) in a compact space, effectively alleviates the contradiction between polyphosphate-accumulating bacteria and nitrifying bacteria sludge age, significantly improves the unit volume treatment efficiency, and reduces the floor space.

[0029] 4) This utility model sets up a flocculation tank at the front end of the denitrification deep bed filter, which effectively plays the role of physical interception and phosphorus removal as well as denitrification and nitrogen removal, ensuring that the effluent quality meets the discharge standards under low C / N ratio conditions.

[0030] 5) This utility model is highly adaptable to low C / N wastewater, has good removal effect on organic pollutants, nitrogen, phosphorus and suspended solids, high treatment efficiency per unit volume, high carbon source utilization rate, high degree of process integration, small footprint, effluent quality meets standards, and strong guarantee. Attached Figure Description

[0031] Figure 1 This is a simplified structural diagram of the integrated nitrogen and phosphorus removal system of this utility model;

[0032] In the diagram, A1—Anaerobic tank, A2-1—Pre-anoxic tank (before #1), A2-2—Post-anoxic tank (after #1), A3—Aerobic tank (#1), A4—Anoxic tank (#2), A5—Aerobic tank (#2), A6—Anoxic tank (#3), A7—Aerobic tank (#3), A8—Secondary sedimentation tank, A9—Flocculation tank, A10—Denitrification deep bed filter, A11—Effluent zone, G1—Sewage inlet pipe for anoxic tank (#1), G2—Sewage inlet pipe for anoxic tank (#2), G3—Sewage inlet pipe for anoxic tank (#3), G4—Aeration inlet pipe for aerobic tank (#1), G5—Aeration inlet pipe for aerobic tank (#2), G6—Aeration inlet pipe for aerobic tank (#13), G7—Mixed liquor return pipe, G8—Sludge return pipe, G9—Excess sludge discharge pipe, G10—Chemical dosing pipe for flocculation tank. G11—Dosing pipe for denitrification filter; G12—Air inlet pipe for backwashing of denitrification filter; G13—Water inlet pipe for backwashing of denitrification filter; G14—Effluent pipe; X1—Suspended packing material for aerobic tank; X2—Quartz sand packing layer for denitrification filter; X3—Pebble support layer for denitrification filter; X4—Filter plate / brick for denitrification filter; C1—Tube-type microporous aerator for aerobic tank; E1—Pipe clamp support for tube-type microporous aerator for aerobic tank; F1—Aeration blower for aerobic tank; F2—Air washing blower for denitrification filter; B1—Wastewater inlet pump; B2—Mixed liquor return pump; B3—Sludge return pump; B4—Backwash water inlet pump for denitrification filter; J1—Anaerobic tank mixer; J2—Anaerobic tank mixer; J3—Rapid mixer for flocculation tank. Detailed Implementation

[0033] The present invention will now be described in detail with reference to specific embodiments.

[0034] This invention provides an integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio. The mixed liquor returned to the anaerobic tank has a low nitrate concentration, which avoids the impact of nitrate on the anaerobic phosphorus release process of polyphosphate-accumulating bacteria and promotes the anaerobic phosphorus release process. By arranging the three sections alternately in anoxic / aerobic, the carbon source in the influent is reasonably distributed through a segmented water intake method, ensuring that the effluent meets the discharge standards under low C / N ratio conditions.

[0035] like Figure 1 As shown, the integrated system for simultaneous nitrogen and phosphorus removal from low carbon-to-nitrogen ratio wastewater based on the MBBR process of this utility model is specifically as follows:

[0036] The following areas are arranged sequentially from front to back: anaerobic tank A1, pre-anoxic tank A2-1, post-anoxic tank A2-2, aerobic tank A3, anoxic tank A4, aerobic tank A5, anoxic tank A6, aerobic tank A7, secondary sedimentation tank A8, flocculation tank A9, denitrification deep bed filter A10, and effluent zone A11. Different areas are separated by partition walls with connecting openings, allowing adjacent areas to remain connected. An effluent pipe is installed at the rear of effluent zone A10, through which wastewater treated by the integrated system is discharged.

[0037] The tops of the pre-anoxic tank A2-1, anoxic tank A4, and anoxic tank A6 are respectively equipped with wastewater inlet pipes G1, G2, and G3 for anoxic tank A2-1, G2, and G3. These pipes are connected to wastewater inlet pump B1, and the wastewater to be treated is pumped in by the wastewater inlet pump B1.

[0038] Anaerobic tank A1 is equipped with an anaerobic tank agitator J2 at the bottom, an anoxic tank agitator J1 is equipped at the bottom of pre-anoxic tank A2-1, post-anoxic tank A2-2, anoxic tank A4, and anoxic tank A6, and a flocculation tank A9 is equipped with a rapid flocculation tank agitator J3 at the bottom.

[0039] Aerobic tanks A3 (1#), A5 (2#), and A7 (3#) are equipped with tubular microporous aerators C1 at their bottoms. These aerators C1 are connected to the outlet of an aeration blower F1 via air inlet pipes G4 (1#), G5 (2#), and G6 (3#), respectively. The blower supplies air to the aerobic tanks. A pipe clamp support E1 is installed at the bottom of each aerobic tank C1. Packing mesh is installed at the connection points between the tank walls of each aerobic tank (A3#, A5#, and A7#), and the mesh is attached to the tank wall. Add 1 type of aerobic tank suspended filler to aerobic tank A3, aerobic tank A5 and aerobic tank A7. The suspended filler is one of polypropylene filler, polyethylene filler and polyurethane filler. The filling volume of the suspended filler is 20-60% of the effective volume of the aerobic tank.

[0040] The bottom of the secondary sedimentation tank A8 is equipped with a sludge return pipe G8 and a residual sludge discharge pipe G9. The sludge return pipe G8 is connected to the pre-anoxic tank A2-1 of No. 1, and a sludge return pump B3 is installed on the sludge return pipe G8. The bottom of the anaerobic tank A1 is connected to the bottom of the post-anoxic tank A2-2 of No. 1 through a mixed liquor return pipe G7, and a mixed liquor return pump B2 is installed on the mixed liquor return pipe G7.

[0041] The flocculation tank A9 is equipped with a flocculation tank dosing pipe G10. Flocculants and coagulants are added through the dosing pipe and quickly mixed by a stirrer to exert physical and chemical effects, thereby removing suspended solids and phosphorus.

[0042] The denitrification deep bed filter A10 is equipped with a denitrification filter dosing pipe G11. From top to bottom, it consists of a water distribution zone, a denitrification filter quartz sand packing layer X2, a denitrification filter pebble support layer X3, and a denitrification filter plate / brick X4. At the bottom of the denitrification deep bed filter A10, there are a denitrification filter backwash air inlet pipe G12 and a denitrification filter backwash water inlet pipe G13. The denitrification filter backwash air inlet pipe G12 is connected to the denitrification filter air washing blower F2, which provides backwash air to the filter. The denitrification filter backwash water inlet pipe G13 is connected to the outlet of the denitrification filter backwash water inlet pump B4, and the inlet of the denitrification filter backwash water inlet pump B4 is connected to the outlet pipe G14 of the outlet zone A11. The treated water is used as the backwash water source, and the filter adopts a combined air-water backwashing method.

[0043] The working method of this utility model for the integrated system of simultaneous nitrogen and phosphorus removal in low carbon-to-nitrogen ratio wastewater based on MBBR process is as follows:

[0044] The wastewater mixture in anaerobic tank A1 is sequentially treated by pre-anoxic tank A2-1, post-anoxic tank A2-2, aerobic tank A3, anoxic tank A4, aerobic tank A5, anoxic tank A6, aerobic tank A7, secondary sedimentation tank A8, flocculation tank A9, and denitrification deep bed filter A10, and then discharged through effluent zone A11;

[0045] First, the wastewater to be treated is pumped in by the sewage inlet pump B1, and then enters the pre-anoxic tank A2-1, the anoxic tank A4 and the anoxic tank A6 respectively through the sewage inlet pipes G1, G2 and G3 of the anoxic tank 1, respectively, thus achieving segmented water intake;

[0046] Air is pressurized by the aeration blower F1 and enters each aerobic tank to ensure an aerobic environment. The suspended packing material X1 in the aerobic tank provides an attachment site for nitrifying bacteria, achieving zoned enrichment and synergistic effects of functional bacteria (nitrifying / denitrifying bacteria, polyphosphate-accumulating bacteria), improving the volume utilization rate of the reaction tank, and eliminating the need for traditional A 2 The nitrification liquid recirculation facility in the O process saves operating energy consumption; the nitrification liquid generated in each aerobic zone directly enters the next anoxic zone, using the carbon source in the raw water for denitrification, breaking through the carbon source limitation of traditional processes, realizing the full utilization of the carbon source in the raw water, and efficiently exerting the denitrification and phosphorus removal effect of wastewater with low C / N ratio.

[0047] Part of the sludge settled at the bottom of the secondary sedimentation tank A8 is pressurized by the sludge return pump B3 and enters the pre-anoxic tank A2-1 through the sludge return pipe G8 to ensure the stability of the amount of activated sludge in the system; excess sludge is discharged out of the system through the excess sludge discharge pipe G9, and phosphorus released by the activated sludge microorganisms in the aerobic tank is also discharged at the same time.

[0048] The wastewater mixed liquor in the post-anoxic tank A2-2 is pressurized by the mixed liquor return pump B2 and enters the anaerobic tank A1 through the mixed liquor return pipe G7. After denitrification in the pre- and post-anoxic tanks of No. 1, nitrates contained in the returned sludge are effectively removed, thus ensuring a low nitrate concentration in the mixed liquor returned to the anaerobic tank. The low nitrate concentration in the mixed liquor effectively avoids the impact of nitrates on the anaerobic phosphorus release by polyphosphate-accumulating bacteria, alleviates the competition between denitrifying bacteria and anaerobic bacteria for carbon sources, promotes anaerobic phosphorus release, and the mixed liquor in the post-anoxic tank of No. 1 is less disturbed by the returned sludge, reducing the impact of the mixed liquor on the anaerobic tank environment, further ensuring the good nitrogen and phosphorus removal effect of the treatment process.

[0049] The wastewater mixture in the secondary sedimentation tank A8 enters the flocculation tank A9. The coagulant and phosphorus removal agent are added to the flocculation tank A9 through the dosing pipe G10. After being mixed and stirred by the rapid agitator J3, large particles are formed and removed by filtration in the next step of the denitrification deep bed filter, effectively reducing the concentration of suspended solids and total phosphorus in the water.

[0050] An external carbon source is added to the denitrification deep bed filter A10 through the dosing pipe G11. Through further denitrification, the total nitrogen in the wastewater is removed to meet or exceed the discharge standards. The suspended particles of the wastewater mixture in the denitrification deep bed filter A10 are intercepted in the pores between the quartz sand packing layers X2 of the denitrification filter.

[0051] Air-washing blower F2 pressurizes air and introduces it into the denitrification deep bed filter A10. Backwash inlet pump B4 pumps effluent from the outlet area into the denitrification deep bed filter A10 through backwash inlet pipe G13. Backwashing of the denitrification deep bed filter A10 is performed through a combined air-water backwashing method. Microorganisms proliferate in the filter media, forming a biofilm. Over time, the porosity between the filter media gradually decreases, and the biofilm thickness gradually increases, causing the water level in the distribution area to rise and the filtered water quality to deteriorate, thus requiring backwashing. Under the flushing action of air and water, friction occurs between the filter media, removing solid suspended matter and adhered biofilm trapped in the filter bed, restoring the filter bed's filtration capacity. The water filtered through the denitrification deep bed filter A10 is finally discharged from the system through outlet pipe G14.

[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] The content of this utility model is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solution of this utility model after reading this utility model specification shall be covered by the claims of this utility model.

Claims

1. An integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio, characterized in that: The following areas are set sequentially from front to back: The anaerobic tank A1, the pre-anoxic tank A2-1, the post-anoxic tank A2-2, the aerobic tank A3, the anoxic tank A4, the aerobic tank A5, the anoxic tank A6, the aerobic tank A7, the secondary sedimentation tank A8, the flocculation tank A9, the denitrification deep bed filter A10, and the effluent zone A11 are all connected by partition walls. The different areas are separated by partition walls with connecting openings, and adjacent areas are connected through these openings. Aerobic tank A3 (1#), aerobic tank A5 (2#), and aerobic tank A7 (3#) are equipped with aerobic tank tubular microporous aerators C1 at the bottom. The bottom of the anaerobic tank A1 is connected to the bottom of the No. 1 post-anoxic tank A2-2 via the mixed liquor return pipe G7, and the mixed liquor return pump B2 is installed on the mixed liquor return pipe G7. The bottom of the secondary sedimentation tank A8 is equipped with a sludge return pipe G8 and a residual sludge discharge pipe G9. The sludge return pipe G8 is connected to the pre-anoxic tank A2-1 of No.

1. A sludge return pump B3 is installed on the sludge return pipe G8. The tops of the pre-anoxic tank A2-1, anoxic tank A4, and anoxic tank A6 are respectively equipped with wastewater inlet pipes G1, G2, and G3 for anoxic tank A2-1, G2, and G3. These pipes are connected to wastewater inlet pump B1, and the wastewater to be treated is pumped in by the wastewater inlet pump B1.

2. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 1, characterized in that: Anaerobic tank A1 is equipped with an anaerobic tank agitator J2 at the bottom, anoxic tank agitator J1 is equipped at the bottom of pre-anoxic tank A2-1, post-anoxic tank A2-2, anoxic tank A4, and anoxic tank A6, and flocculation tank A9 is equipped with rapid flocculation tank agitator J3 at the bottom.

3. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 2, characterized in that: Aerobic tank suspended packing material X1 is added to aerobic tank A3, aerobic tank A5 and aerobic tank A7.

4. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 3, characterized in that: The tubular microporous aerators C1 at the bottom of aerobic tanks A3, A5, and A7 are connected to the outlet end of the aerobic tank aeration blower F1 via aeration inlet pipes G4, G5, and G6, respectively.

5. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 4, characterized in that: The bottom of the aerobic tank tubular microporous aerator C1 is equipped with an aerobic tank tubular microporous aerator pipe clamp bracket E1.

6. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 5, characterized in that: All aerobic tanks A3 (No. 1), A5 (No. 2), and A7 (No. 3) have packing mesh installed at the connecting openings of their walls.

7. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 6, characterized in that: The flocculation tank A9 is equipped with a flocculation tank dosing pipe G10.

8. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 7, characterized in that: The denitrification deep bed filter A10 is equipped with a denitrification filter dosing pipe G11. From top to bottom, it is equipped with a water distribution zone, a denitrification filter quartz sand packing layer X2, a denitrification filter pebble support layer X3, and a denitrification filter plate and filter brick X4.

9. The integrated system for simultaneous nitrogen and phosphorus removal from wastewater with a low carbon-to-nitrogen ratio according to claim 8, characterized in that: The bottom of the denitrification deep bed filter A10 is provided with a denitrification filter backwash air inlet pipe G12 and a denitrification filter backwash water inlet pipe G13; The backwash air inlet pipe G12 of the denitrification filter is connected to the air washing blower F2 of the denitrification filter; The backwash inlet pipe G13 of the denitrification filter is connected to the outlet of the backwash inlet pump B4 of the denitrification filter, and the inlet of the backwash inlet pump B4 of the denitrification filter is connected to the outlet pipe G14 of the outlet zone A11.

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