Township domestic sewage phosphorus and nitrogen removal reaction device

Abstract

The present application provides a kind of township domestic sewage phosphorus removal denitrification reaction device, belong to wastewater treatment technical field, including chassis, processing jar part, spiral micro-oxygen denitrification component, nitrogen aeration component, oxygen aeration component and nitrogen production part, main jar body is divided into iron-carbon micro-electrolysis cavity, anaerobic phosphorus release cavity, micro-oxygen denitrification cavity and sedimentation separation cavity, sewage flows through each cavity from bottom to top in turn to complete phosphorus removal denitrification treatment;Iron-carbon micro-electrolysis cavity fills iron-carbon particle packing, utilizes micro-electrolysis autotrophic denitrification;Anaerobic phosphorus release cavity is realized hydraulic self-agitation with piston pulse opposite jet, and nitrogen is imported to prevent sludge deposition;Micro-oxygen denitrification cavity is equipped with spiral denitrification component and iron-carbon sintered porous ceramsite packing, realizes short-range nitrification coupling anaerobic ammonia oxidation and denitrification under the condition of micro-oxygen;Nitrogen production part nitrogen is sent into anaerobic phosphorus release cavity to prevent deposition, and oxygen is sent into micro-oxygen denitrification cavity to limit oxygen aeration;Compact structure, low energy consumption, operation and maintenance are simple, suitable for township decentralized wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a phosphorus and nitrogen removal reaction device for rural domestic sewage. Background Technology

[0002] Rural domestic sewage is characterized by small volume, large fluctuations in water quality, and low carbon-to-nitrogen ratio. The difficulties in its treatment are mainly reflected in the competition for carbon sources, sludge age contradictions, and limited operation and maintenance conditions during the phosphorus removal and denitrification processes.

[0003] Currently, rural domestic sewage treatment mainly uses simplified versions of urban sewage treatment processes, with common technologies including the traditional activated sludge process and A... 2 / O process, SBR process, and contact oxidation method, etc. However, the above processes have the following obvious drawbacks in rural application scenarios: First, traditional biological nitrogen removal relies on heterotrophic denitrifying bacteria using organic matter as electron donors to reduce nitrate nitrogen. Similarly, biological phosphorus removal requires polyphosphate-accumulating bacteria to synthesize polyhydroxyalkanoates (PHAs) from organic matter under anaerobic conditions. When organic carbon sources in wastewater are limited, denitrifying bacteria and polyphosphate-accumulating bacteria compete for carbon sources, leading to incomplete nitrogen removal and decreased phosphorus removal efficiency. The carbon-to-nitrogen ratio of rural domestic wastewater is generally below 4, resulting in a severe shortage of carbon sources for conventional heterotrophic denitrification. This often necessitates the external addition of carbon sources such as methanol and sodium acetate to maintain nitrogen removal efficiency, leading to high operating costs and difficulty in precisely controlling the dosage.

[0004] Secondly, traditional anaerobic or anoxic tanks require mechanical agitators to maintain sludge suspension. These agitators are energy-intensive, wear out quickly, and have a high failure rate. Insufficient agitation or intermittent shutdowns cause sludge to rapidly settle at the bottom, reducing effective volume and hindering complete biochemical reactions. Furthermore, filamentous sludge bulking is prone to occur under low load or low temperature conditions, leading to deteriorated settling performance and a decline in effluent quality.

[0005] Third, the phosphorus and nitrogen removal process requires alternating operation of multiple environments such as anaerobic and aerobic. Traditional multi-stage series processes have each reaction tank set up independently, which results in a large footprint, long pipelines, high reflux energy consumption, and low volume utilization. Summary of the Invention

[0006] The purpose of this invention is to provide a phosphorus and nitrogen removal reaction device for rural domestic sewage. It eliminates the dependence on external carbon sources through iron-carbon micro-electrolysis autotrophic denitrification, replaces mechanical stirring devices with hydraulic pulse self-stirring to reduce energy consumption and equipment complexity, adopts an integrated cavity structure and spiral flow channel to improve volume utilization, and utilizes a nitrogen generation unit with dual gas synergy to meet the needs of anaerobic anti-deposition and oxygen-limited aeration. Thus, it achieves efficient, low-consumption and stable treatment of rural domestic sewage in a compact structure.

[0007] The objective of this invention is achieved through the following technical solution: a phosphorus and nitrogen removal reaction device for rural domestic sewage, comprising a treatment tank, a counter-flushing discharge mechanism, a spiral micro-oxygen denitrification component, a nitrogen aeration component, an oxygen aeration component, and a nitrogen generation unit. The processing tank includes a main tank body, which contains, from bottom to top, an iron-carbon micro-electrolysis chamber, an anaerobic phosphorus release chamber, a micro-oxygen denitrification chamber, and a precipitation separation chamber. The iron-carbon micro-electrolysis chamber is filled with iron-carbon granular packing material. The counter-flushing water discharge mechanism is located inside the anaerobic phosphorus release chamber. The counter-flushing water discharge mechanism includes a variable diameter cylinder, a conical water passage cylinder, and a piston. The conical water passage cylinder is connected to the iron-carbon micro-electrolysis chamber. The bottom end of the variable diameter cylinder is fixedly connected to the outer wall of the upper end of the conical water passage cylinder. The piston is elastically closed and slidably connected to the lower end of the inner cavity of the variable diameter cylinder. The lower end of the side wall of the variable diameter cylinder is evenly connected with a first counter-flushing nozzle and a second counter-flushing nozzle. The first counter-flushing nozzle and the second counter-flushing nozzle are used in pairs. The outlets of the first counter-flushing nozzle and the second counter-flushing nozzle of each pair are directly opposite each other. The spiral micro-oxygen denitrification component is located inside the micro-oxygen denitrification chamber. The spiral micro-oxygen denitrification component includes a spiral cylinder, which is filled with iron-carbon sintered porous ceramic filler. The outer inlet of the spiral cylinder is unidirectionally connected to the anaerobic phosphorus release chamber, allowing water to flow into the spiral cylinder only from the anaerobic phosphorus release chamber. The central outlet of the spiral cylinder is connected to the sedimentation separation chamber. The nitrogen aeration assembly is located inside the anaerobic phosphorus release chamber, with each of its outlets facing the bottom of the inner cavity of the anaerobic phosphorus release chamber. The oxygen aeration assembly is located inside the micro-oxygen denitrification chamber, with each of its outlets facing upwards and placed at the bottom of the spiral cylinder. The nitrogen produced by the nitrogen generation unit is supplied to the nitrogen aeration assembly, and the separated oxygen is supplied to the oxygen aeration assembly.

[0008] The process of using the technical solution of this invention is as follows: The wastewater to be treated enters the iron-carbon micro-electrolysis chamber through the bottom wall of the tank, and passes through the iron-carbon micro-electrolysis chamber, anaerobic phosphorus release chamber, micro-oxygen denitrification chamber and sedimentation separation chamber from bottom to top. Finally, the supernatant overflows from the sedimentation separation chamber and is discharged. The iron-carbon micro-electrolysis chamber is filled with iron-carbon granular filler. After the sewage enters, the iron particles and carbon particles come into contact in the sewage to form countless tiny galvanic cells. As wastewater continuously enters the iron-carbon micro-electrolysis chamber, the water level inside the chamber rises continuously, and the water pressure gradually increases. The bottom inlet of the conical water-passing cylinder is connected to the iron-carbon micro-electrolysis chamber. The wastewater in the iron-carbon micro-electrolysis chamber acts upward on the elastically closed piston through the conical water-passing cylinder. When the water pressure reaches the elastic opening threshold of the piston, the wastewater pushes the piston to slide upward along the inner wall of the variable diameter cylinder. The top opening of the conical water-passing cylinder is opened, and the accumulated wastewater flows into the space between the inner cavity of the variable diameter cylinder and the bottom surface of the piston through the conical water-passing cylinder. Then it is sprayed out simultaneously from the first and second counter-current nozzles. The path between the outlet of the second counter-jet nozzle and the side wall of the variable diameter cylinder is exactly the same as the path between the outlet of the first counter-jet nozzle and the side wall of the variable diameter cylinder. The first and second counter-jet nozzles are set in pairs with their outlets facing each other, so that the two jets collide and flow with the same pressure in the anaerobic phosphorus release chamber. This keeps the wastewater in the anaerobic phosphorus release chamber in a dynamic state, keeping the sludge in the wastewater suspended and preventing sedimentation. When the water level in the iron-carbon micro-electrolysis chamber drops to a point where the water pressure is lower than the elastic restoring force of the piston, the piston slides back and closes the top opening of the conical water passage cylinder, and the first and second flushing nozzles stop discharging water. After that, the wastewater in the iron-carbon micro-electrolysis chamber accumulates and pressurizes again, and the piston is pushed open again, thus forming an intermittent pulse flushing water circulation. This intermittent pulse flushing mechanism can achieve uniform mixing and suspension of sludge in the anaerobic phosphorus release chamber without the need for a mechanical stirring device. In the anaerobic phosphorus release chamber, polyphosphate-accumulating bacteria (PAOs) absorb organic matter in wastewater under anaerobic conditions to synthesize polyhydroxyalkanoates (PHAs) and release phosphate ions; denitrifying polyphosphate-accumulating bacteria (DPAOs) also perform anaerobic phosphorus release and store PHAs, which serve as energy reserves for denitrification phosphorus uptake in the subsequent micro-aerobic denitrification chamber. Nitrogen gas produced by the nitrogen generation unit is introduced into the anaerobic phosphorus release chamber from the bottom through the nitrogen aeration components. Each outlet of the nitrogen aeration components faces the bottom surface of the inner cavity of the anaerobic phosphorus release chamber. Nitrogen bubbles pass through the sludge layer from bottom to top, generating an airlift stirring effect. During the intermittent pauses of the pulse jet nozzles, nitrogen micro-aeration maintains low-intensity continuous stirring, further preventing sludge deposition. Since nitrogen is an inert gas and does not contain oxygen, its introduction does not increase dissolved oxygen in the water, maintaining the low dissolved oxygen and low redox potential environment required for anaerobic phosphorus release. After anaerobic phosphorus release treatment, the wastewater flows unidirectionally into the spiral micro-aerobic denitrification component from the outer inlet of the spiral cylinder. Only water flow is allowed to enter the spiral cylinder from the anaerobic phosphorus release chamber to prevent backflow. The wastewater flows from the outside to the center along the spiral flow channel inside the spiral cylinder and flows through the iron-carbon sintered porous ceramsite filler packed inside the spiral cylinder. The biofilm growing on the surface and within the pores of the iron-carbon sintered porous ceramsite filler performs multiple nitrogen and phosphorus removal functions under micro-oxygen conditions. On the surface of the biofilm, ammonia-oxidizing bacteria (AOB) oxidize ammonia nitrogen to nitrite nitrogen, inhibiting the activity of nitrite-oxidizing bacteria (NOB) under micro-oxygen conditions, thus keeping the nitrification reaction at the nitrite nitrogen stage. In the anoxic zone of the inner biofilm layer, anaerobic ammonia-oxidizing bacteria (AnAOB) directly react ammonia nitrogen with nitrite nitrogen to generate nitrogen gas and water. In the deep anaerobic zone of the biofilm, the iron-carbon microparticles embedded in the ceramsite form auxiliary micro-galvanic cells, driving autotrophic denitrification to reduce residual nitrate nitrogen to nitrogen gas. Simultaneously, denitrifying polyphosphate-accumulating bacteria (DPAOs) utilize nitrite or nitrate nitrogen as electron acceptors for denitrification and phosphorus uptake, achieving simultaneous nitrogen and phosphorus removal from the same carbon source. The iron-carbon microparticles embedded in the ceramsite also have a flocculation effect, promoting the compaction of bacterial flocs and inhibiting the bulking of filamentous sludge. Oxygen separated from the nitrogen generation section is introduced upward from the bottom of the spiral cylinder through the oxygen aeration assembly. Each outlet of the oxygen aeration assembly is placed at the bottom of the spiral cylinder with its outlet facing upward. The bubbles rise along the spiral channel and pass through the iron-carbon sintered porous ceramsite packing layer, supplying oxygen to the biofilm and driving the water flow towards the center along the spiral path. The spiral channel extends the contact time and contact area between the wastewater and the biofilm, improving the denitrification efficiency within the limited cavity volume. At the same time, the air lift driving effect of the rising bubbles causes the water to continuously flow towards the center along the spiral channel. After being treated with micro-aerobic denitrification, the wastewater enters the sedimentation and separation chamber from the center outlet of the spiral drum, where suspended sludge settles and separates, and the supernatant overflows and is discharged. The nitrogen generation unit uses the pressure swing adsorption principle to separate air, separating nitrogen and oxygen in the air; the produced nitrogen is supplied to the nitrogen aeration component for anaerobic anti-deposition stirring in the anaerobic phosphorus release chamber, and the by-product oxygen-enriched gas is supplied to the oxygen aeration component for micro-aerobic aeration in the micro-aerobic denitrification chamber, thus meeting the anaerobic stirring requirements of the anaerobic phosphorus release chamber and the aerobic aeration requirements of the micro-aerobic denitrification chamber. Furthermore, the wastewater treatment process in each chamber is not a one-time rapid flow, but requires sufficient reaction time in each chamber to ensure that the biochemical reaction is fully completed.

[0009] Since each chamber needs to ensure a minimum hydraulic retention time, the device is equipped with an inlet control system to control the flow rate of sewage entering the main tank, preventing excessive inlet flow from causing insufficient reaction time in each chamber.

[0010] By adopting the above technical solution, the present invention can achieve the following beneficial effects: (1) This invention utilizes the iron and carbon particles in the iron-carbon micro-electrolysis chamber to form numerous micro-galvanic cells in the wastewater, driving autotrophic denitrification to directly reduce nitrate nitrogen to nitrogen gas, eliminating the need for the organic carbon source required for heterotrophic denitrification, and fundamentally avoiding competition between denitrifying bacteria and polyphosphate-accumulating bacteria for carbon source; in the micro-aerobic denitrification chamber, the biofilm on the surface of the iron-carbon sintered porous ceramic packing works in layers, with the surface ammonia-oxidizing bacteria oxidizing ammonia nitrogen to nitrite nitrogen, the inner anaerobic ammonia-oxidizing bacteria using ammonia nitrogen and nitrite nitrogen to directly react and generate nitrogen gas, and the deep iron-carbon microparticles forming auxiliary micro-galvanic cells to drive the reduction of residual nitrate nitrogen; at the same time, denitrifying polyphosphate-accumulating bacteria use nitrite nitrogen as an electron acceptor to denitrify and absorb phosphorus, achieving simultaneous denitrification and phosphorus removal from the same carbon source; the above multiple mechanisms work together to enable the device to maintain high-efficiency treatment performance without external carbon source under low carbon-nitrogen ratio conditions, significantly reducing operating costs; (2) The present invention drives the piston to open and close by raising and lowering the water level in the iron-carbon micro-electrolysis chamber, forming an intermittent pulse-type counter-flushing water discharge. The two jets collide at equal pressure in the anaerobic phosphorus release chamber, which can maintain the uniform suspension of sludge without the need for a mechanical stirring device. At the same time, nitrogen gas separated from the nitrogen production section is introduced from the bottom of the chamber through micro-aeration. The air lifting effect continuously stirs and prevents sedimentation. Moreover, nitrogen gas does not contain oxygen, which is conducive to maintaining the anaerobic low dissolved oxygen environment. In addition, the iron ions released by the iron-carbon microparticles embedded in the ceramic particles have a flocculation effect, which promotes the compaction of bacterial flocs, inhibits the expansion of filamentous bacterial sludge, and ensures the long-term stable operation of the system. (3) This invention integrates four chambers—iron-carbon micro-electrolysis, anaerobic phosphorus release, micro-oxygen denitrification, and sedimentation separation—into a single tank. Wastewater flows sequentially through each chamber from bottom to top, eliminating the need for independent reaction tanks and long-distance return pipelines for multi-stage series processes. This results in a small footprint and high volume utilization. The spiral flow channel of the spiral cylinder in the micro-oxygen denitrification chamber extends the contact time and contact area between wastewater and biofilm, significantly improving denitrification efficiency within a limited chamber volume. The nitrogen generation unit uses the pressure swing adsorption principle with dual gas supply: nitrogen is supplied to the anaerobic phosphorus release chamber for anti-deposition stirring, and oxygen-enriched gas is supplied to the micro-oxygen denitrification chamber for aeration. This allows for simultaneous satisfaction of anaerobic and aerobic needs without the need for independent gas supply equipment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of each processing chamber inside the main tank of the present invention; Figure 3 This is a schematic diagram of the water distributor part of the present invention; Figure 4 This is a schematic diagram of the structure of the flushing water discharge mechanism and the nitrogen aeration component of the present invention; Figure 5 This is a cross-sectional view of the counter-flushing water discharge mechanism of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the spiral micro-oxygen denitrification component and the precipitation separation component of the present invention; Figure 7 This is a front view of the spiral cylinder portion of the present invention; Figure 8 This is a schematic diagram of the structure of the oxygen aeration component of the present invention; Figure 9 This is a front view of the spiral partition portion of the present invention; Figure 10 This is a schematic diagram of the installation structure of the nitrogen generating unit of the present invention; Figure 11 This is a schematic diagram of the connection of the nitrogen generating unit of the present invention.

[0013] Figure label: 1. Base frame; 2. Treatment tank section; 3. Water distributor; 4. Iron-carbon granular packing; 5. Counter-flushing water discharge mechanism; 6. Spiral micro-oxygen denitrification assembly; 7. Sedimentation separation assembly; 8. Nitrogen aeration assembly; 9. Oxygen aeration assembly; 10. Nitrogen generator; 201. Main tank body; 202. Footing; 203. First baffle; 204. Second baffle; 205. Third baffle; 206. Drain pipe; 207. Drain valve; 208. Iron-carbon micro-electrolysis chamber; 209. Anaerobic phosphorus release chamber; 210. Micro-oxygen denitrification chamber; 211. Sedimentation separation chamber; 301. Main inlet pipe; 302. Branch pipe; 303. Water distribution hole; 304. Inlet valve; 501. Variable diameter cylinder; 502. First counter-flushing nozzle; 503. Second counter-flushing nozzle 504. Anti-settling nozzle; 505. Conical water passage cylinder; 506. Guide column; 507. Guide plate; 508. Compression spring; 509. Piston; 510. Guide cylinder; 601. Spiral cylinder; 602. Water inlet pipe; 603. One-way valve; 604. Spiral baffle; 605. Iron-carbon sintered porous ceramsite packing; 701. Flow guide cylinder; 702. Wide-flow cone; 703. Conical mud hopper; 704. Fixed sleeve; 705. Eccentric interface; 706. Mud discharge pipe; 707. Mud discharge valve; 801. Nitrogen aeration disc; 802. Branch pipe; 803. Nitrogen nozzle; 901. Oxygen aeration disc; 902. Oxygen aeration head; 1001. Air compressor; 1002. PSA nitrogen generator; 1003. Nitrogen buffer tank. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] Example 1: Examples of the process for treating domestic sewage according to the present invention Figures 1-10 As shown; The main tank 201 in the treatment tank section 2 is provided with an iron-carbon micro-electrolysis chamber 208, an anaerobic phosphorus release chamber 209, a micro-aerobic denitrification chamber 210, and a sedimentation separation chamber 211 from bottom to top. The wastewater to be treated enters from the bottom wall of the main tank 201. The iron-carbon micro-electrolysis chamber 208 is filled with iron-carbon granular filler 4; The counter-flushing water discharge mechanism 5 is located inside the anaerobic phosphorus release chamber 209. The counter-flushing water discharge mechanism 5 includes a variable diameter cylinder 501, a first counter-flushing nozzle 502, a second counter-flushing nozzle 503, a conical water passage cylinder 505, and a piston 509. The conical water passage cylinder 505 is connected to the iron-carbon micro-electrolysis chamber 208. The bottom end of the variable diameter cylinder 501 is fixedly connected to the outer wall of the upper end of the conical water passage cylinder 505. The piston 509 is elastically and slidably connected to the lower end of the inner cavity of the variable diameter cylinder 501, closing the top opening of the conical water passage cylinder 505. The lower end of the side wall of the cylinder 501 is evenly connected with a first pair of jet nozzles 502 and a second pair of jet nozzles 503, and the first pair of jet nozzles 502 and the second pair of jet nozzles 503 are used in pairs. The outlets of the first pair of jet nozzles 502 and the second pair of jet nozzles 503 are directly opposite each other. This allows the wastewater in the iron-carbon micro-electrolysis chamber 208 to accumulate to a certain extent, which can intermittently push the piston 509 in the elastically closed state, thereby achieving the purpose of intermittently opening the outlet of the conical water-passing cylinder 505. The spiral micro-oxygen denitrification component 6 is located inside the micro-oxygen denitrification chamber 210. The spiral micro-oxygen denitrification component 6 includes a spiral cylinder 601 and an iron-carbon sintered porous ceramic filler 605. The spiral cylinder 601 is filled with iron-carbon sintered porous ceramic filler 605. The outer inlet of the spiral cylinder 601 is unidirectionally connected to the anaerobic phosphorus release chamber 209, allowing water to flow into the spiral cylinder 601 only from the anaerobic phosphorus release chamber 209. The central outlet of the spiral cylinder 601 is connected to the sedimentation separation chamber 211. The nitrogen aeration assembly 8 is located inside the anaerobic phosphorus release chamber 209, and each of its outlets faces the bottom surface of the inner cavity of the anaerobic phosphorus release chamber 209. The oxygen aeration assembly 9 is located inside the micro-oxygen denitrification chamber 210, and each of its outlets faces upward and is placed at the bottom of the spiral cylinder 601. The nitrogen generated by the nitrogen generation section 10 is supplied to the nitrogen aeration assembly 8, and the separated oxygen is supplied to the oxygen aeration assembly 9. The working principle is as follows: The wastewater to be treated enters the iron-carbon micro-electrolysis chamber 208 through the bottom wall of the self-contained tank 201, and passes through the iron-carbon micro-electrolysis chamber 208, anaerobic phosphorus release chamber 209, micro-aerobic denitrification chamber 210 and sedimentation separation chamber 211 from bottom to top. Finally, the supernatant overflows from the sedimentation separation chamber 211 and is discharged. The iron-carbon micro-electrolysis chamber 208 is filled with iron-carbon granular filler 4. After sewage enters, the iron particles and carbon particles come into contact in the sewage to form countless tiny galvanic cells. Iron acts as the anode and spontaneously oxidizes to release Fe. 2+ And electronics: Fe 0 →Fe 2+ +2e - ; Carbon acts as the cathode, accepting electrons and reducing H₂ in the water. + H2 is generated: 2H + +2e - →H2; Released Fe 2+ As an inorganic electron donor driving autotrophic denitrification, Fe reduces nitrate nitrogen in wastewater to nitrogen gas. 2+ Further oxidation to Fe 3+ It then reacts with phosphate ions in water to form insoluble iron phosphate precipitate (FePO4), achieving chemical precipitation for phosphorus removal. Simultaneously, the micro-electrolysis alkali production process compensates for the alkalinity consumed in the subsequent nitration reaction. This process requires no external power source, relying entirely on the self-generated potential difference of the iron-carbon galvanic cell. As wastewater continues to enter the iron-carbon micro-electrolysis chamber 208, the water level inside the chamber rises continuously, and the water pressure gradually increases. The bottom inlet of the conical water-passing cylinder 505 is connected to the iron-carbon micro-electrolysis chamber 208. The wastewater inside the chamber acts upward on the elastically closed piston 509 through the conical water-passing cylinder 505. When the water pressure reaches the elastic opening threshold of the piston 509, the wastewater pushes the piston 509 to slide upward along the inner wall of the variable diameter cylinder 501. The top opening of the conical water-passing cylinder 505 is opened, and the accumulated wastewater flows through the conical water-passing cylinder 505 into the space between the inner cavity of the variable diameter cylinder 501 and the bottom surface of the piston 509. Then, it is sprayed out simultaneously from the first counter-current nozzle 502 and the second counter-current nozzle 503. The path between the outlet of the second counter-current nozzle 503 and the side wall of the variable diameter cylinder 501 is exactly the same as the path between the outlet of the first counter-current nozzle 502 and the side wall of the variable diameter cylinder 501. The first counter-current nozzle 502 and the second counter-current nozzle 503 are arranged in pairs with their outlets facing each other, so that the two jets collide and converge in the anaerobic phosphorus release chamber 209 with the same pressure. This keeps the wastewater in the anaerobic phosphorus release chamber 209 in a dynamic state, keeping the sludge in the wastewater in a suspended state and preventing sedimentation. When the water level in the iron-carbon micro-electrolysis chamber 208 drops to a point where the water pressure is lower than the elastic restoring force of the piston 509, the piston 509 slides back and recloses the top opening of the conical water passage 505, and the first counter-flushing nozzle 502 and the second counter-flushing nozzle 503 stop discharging water; thereafter, the sewage in the iron-carbon micro-electrolysis chamber 208 accumulates and pressurizes again, and the piston 509 is pushed open again, thus forming an intermittent pulse counter-flushing water discharge cycle. This intermittent pulse counter-flushing mechanism can achieve uniform mixing and suspension of sludge in the anaerobic phosphorus release chamber 209 without the need for a mechanical stirring device. Inside the anaerobic phosphorus release chamber 209, polyphosphate-accumulating bacteria (PAOs) absorb organic matter in wastewater under anaerobic conditions to synthesize polyhydroxyalkanoates (PHA) and release phosphate ions; denitrifying polyphosphate-accumulating bacteria (DPAOs) also perform anaerobic phosphorus release and store PHA, reserving energy for denitrification phosphorus uptake in the subsequent micro-aerobic denitrification chamber. Nitrogen gas produced by nitrogen generation unit 10 is introduced into the bottom of anaerobic phosphorus release chamber 209 through nitrogen aeration component 8. Each outlet of nitrogen aeration component 8 faces the bottom surface of the inner cavity of anaerobic phosphorus release chamber 209. Nitrogen bubbles pass through the sludge layer from bottom to top, generating an air lift stirring effect. During the intermittent pause of the pulse jet nozzles, nitrogen micro-aeration maintains low-intensity continuous stirring, further preventing sludge deposition. Since nitrogen is an inert gas and does not contain oxygen, its introduction does not increase dissolved oxygen in the water, maintaining the low dissolved oxygen and low redox potential environment required for anaerobic phosphorus release. After anaerobic phosphorus release treatment, the wastewater flows unidirectionally into the spiral micro-aerobic denitrification component 6 from the outer inlet of the spiral cylinder 601. Only water flow is allowed to enter the spiral cylinder 601 from the anaerobic phosphorus release chamber 209 to prevent backflow. The wastewater flows from the outside to the center along the spiral flow channel inside the spiral cylinder 601 and flows through the iron-carbon sintered porous ceramsite packing 605 filled in the spiral cylinder 601. The biofilm growing on the surface and within the pores of the iron-carbon sintered porous ceramsite filler 605 performs multiple denitrification and phosphorus removal functions under micro-oxygen conditions. At the biofilm surface, dissolved oxygen is maintained at 1.0-2.0 mg / L, where ammonia-oxidizing bacteria (AOB) oxidize ammonia nitrogen to nitrite nitrogen, inhibiting the activity of nitrite-oxidizing bacteria (NOB) under micro-oxygen conditions, thus keeping the nitrification reaction at the nitrite nitrogen stage. In the anoxic zone of the inner biofilm, anaerobic ammonia-oxidizing bacteria (AnAOB) directly react ammonia nitrogen with nitrite nitrogen to produce nitrogen gas and water. In the deep anaerobic zone of the biofilm, the iron-carbon microparticles embedded within the ceramsite form auxiliary micro-galvanic cells, releasing Fe...2+ The autotrophic denitrification process reduces residual nitrate nitrogen to nitrogen gas; simultaneously, denitrifying phosphorus-accumulating bacteria (DPAOs) utilize nitrite or nitrate nitrogen as electron acceptors for denitrification and phosphorus uptake, achieving simultaneous nitrogen and phosphorus removal from the same carbon source. The iron-carbon microparticles embedded in the ceramsite release Fe... 3+ It has a flocculation effect, promotes the compaction of bacterial flocs, and inhibits the bulking of filamentous sludge. Oxygen separated from nitrogen generation unit 10 is introduced upward from the bottom of spiral cylinder 601 through oxygen aeration component 9. Each outlet of oxygen aeration component 9 is placed upward at the bottom of spiral cylinder 601. Bubbles rise along spiral channel and pass through iron-carbon sintered porous ceramic filler 605 layer, supplying oxygen to biofilm and driving water flow along spiral path towards the center. Spiral channel prolongs the contact time and contact area between sewage and biofilm, improving denitrification efficiency within limited cavity volume. At the same time, the air lift driving effect of rising bubbles causes water to continuously flow towards the center along spiral channel. After micro-aerobic denitrification treatment, the wastewater enters the sedimentation and separation chamber 211 from the central outlet of the spiral drum 601, where suspended sludge settles and separates, and the supernatant overflows and is discharged. The nitrogen generation unit 10 uses the pressure swing adsorption principle to separate air, separating nitrogen and oxygen in the air; the produced nitrogen (purity ≥90%) is supplied to the nitrogen aeration component 8 for anaerobic anti-deposition stirring of the anaerobic phosphorus release chamber 209, and the by-product oxygen-enriched gas is supplied to the oxygen aeration component 9 for micro-aerobic aeration of the micro-aerobic denitrification chamber 210, thus meeting the anaerobic stirring requirements of the anaerobic phosphorus release chamber 209 and the aerobic aeration requirements of the micro-aerobic denitrification chamber 210. Furthermore, the wastewater treatment process in each chamber is not a one-time rapid flow, but requires sufficient reaction time in each chamber to ensure the complete completion of the biochemical reactions. The designed retention times for each chamber are as follows: Because the iron-carbon galvanic cell reaction requires sufficient contact between iron particles and wastewater, Fe 2+ Release and FePO4 chemical precipitation require reaction time; insufficient residence time will result in Fe 2+ The release amount is insufficient, resulting in a lack of electron donors for subsequent autotrophic denitrification; the iron-carbon microelectrolysis chamber 208 remains for 1-2 hours. Anaerobic phosphorus release by PAOs / DPAOs is a biological metabolic process that requires time to absorb COD from wastewater, synthesize PHA, and release phosphate ions into the water. Insufficient retention time leads to inadequate phosphorus release and insufficient subsequent phosphorus uptake. Therefore, the retention time in the anaerobic phosphorus release chamber 209 is 1.5-2.5 hours. Short-cut nitrification (AOB), anaerobic ammonium oxidation (AnAOB), and autotrophic denitrification are all slow biological reactions with long biofilm metabolic cycles. Although the contact path has been extended in the spiral tube flow channel, a minimum transit time still needs to be ensured. Therefore, the residence time in the micro-aerobic denitrification chamber 210 is 3-5 hours. How long should the sediment remain in the sedimentation separation chamber 211 (0.5-1 hour)? Since each chamber needs to ensure a minimum hydraulic retention time, the device is equipped with an inlet control system to control the flow rate of sewage entering the main tank 201, preventing excessive inlet flow rate from causing insufficient reaction time in each chamber.

[0017] The specific structure of the processing tank 2 is as follows: Figure 2 As shown, the first partition 203, the second partition 204 and the third partition 205 are fixed to the inner wall of the main tank 201 from bottom to top, and are used to divide the inner cavity of the main tank 201 into an iron-carbon micro-electrolysis chamber 208, an anaerobic phosphorus release chamber 209, a micro-oxygen denitrification chamber 210 and a precipitation separation chamber 211. A base frame 1 is provided below the main tank body 201, and feet 202 are evenly fixed to the outer bottom of the main tank body 201, with the bottom end of the feet 202 being fixedly connected to the top end of the base frame 1. A drain pipe 206 is connected to the upper end of the side wall of the main tank 201. A drain valve 207 is installed in the drain pipe 206. The drain valve 207 remains open during normal operation of the device and is closed only in the following two situations: First, when the device is shut down for maintenance, close the drain valve 207 and drain the water in the cavity to facilitate cleaning the conical mud hopper 703 and inspecting the internal components. Secondly, during the sludge removal operation, if the mud and water are agitated significantly during the sludge removal process, which may affect the water quality of the effluent from the clear water zone, the drain valve 207 can be temporarily closed and reopened after the sludge removal is completed and the settling zone has returned to stability.

[0018] The specific structures of the flushing water discharge mechanism 5, the spiral micro-oxygen denitrification component 6, the nitrogen aeration component 8, and the oxygen aeration component 9 are as follows: Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the conical water-passing cylinder 505 is integrally formed with the first partition 203, and the large conical end of the conical water-passing cylinder 505 faces the side of the first partition 203, the outer wall of the small conical end is fixed to the bottom end of the variable diameter cylinder 501, and the top end of the variable diameter cylinder 501 is fixed to the bottom surface of the second partition 204. A guide cylinder 510 is fixed in the middle of the bottom surface of the second partition 204. A guide column 506 is slidably connected inside the guide cylinder 510. A guide plate 507 is fixed to the bottom end of the guide column 506. A piston 509 is installed and fixed to the bottom end of the guide plate 507. A compression spring 508 is sleeved on the outside of the guide cylinder 510. One end of the compression spring 508 is fixed to the top surface of the guide plate 507, and the other end is fixed to the bottom surface of the second partition 204. It can provide a supporting elastic force for the guide plate 507 and the piston 509 towards the conical water passage cylinder 505, so that within the supporting elastic force range set by the compression spring 508, the piston 509 is in the position of closing the top opening of the conical water passage cylinder 505. The lower part of the reducing cylinder 501 is cylindrical and the upper part is conical. The opening and closing action of the piston 509 always takes place on the inner wall of the cylinder of the reducing cylinder 501, so there will be no obstruction or leakage. The lower end of the side wall of the variable diameter cylinder 501 is also evenly connected with anti-settling nozzles 504. The outlet of the anti-settling nozzles 504 also faces the bottom surface of the inner cavity of the anaerobic phosphorus release chamber 209, which can further improve the stirring effect and anti-settling effect on the sewage in the anaerobic phosphorus release chamber 209. One end of the water inlet pipe 602 is connected to the outer wall of the spiral cylinder 601, and the other end passes through the second partition 204 and enters the inner cavity of the anaerobic phosphorus release chamber 209. A one-way valve 603 is installed in the water inlet pipe 602. A perforated spiral baffle 604 is fixed to the lower inner end of the spiral cylinder 601. Iron-carbon sintered porous ceramsite filler 605 is filled in the spiral cylinder 601 located above the spiral baffle 604. The spiral baffle 604 is used to form a barrier between each outlet of the oxygen aeration component 9 and the iron-carbon sintered porous ceramsite filler 605. The top end of the spiral cylinder 601 is fixedly connected to the bottom surface of the third partition 205; The nitrogen aeration disc 801 passes through the side wall of the main tank 201 and enters the inner cavity of the anaerobic phosphorus release chamber 209. The nitrogen nozzles 803 are evenly connected to the bottom wall of the nitrogen aeration disc 801 and the position directly opposite the first partition 203. After the nitrogen enters from the nitrogen aeration disc 801, it can be sprayed downward from each group of nitrogen nozzles 803. A branch pipe 802 is also uniformly fixed between the bottom outer wall of the nitrogen aeration disc 801 and the top surface of the first partition 203, which is used to form an interval placement of the nitrogen aeration disc 801 relative to the first partition 203, providing space for the nitrogen nozzle 803. The oxygen aeration disc 901 passes through the side wall of the main tank 201 and enters the inner cavity of the micro-oxygen denitrification chamber 210. The oxygen aeration heads 902 are evenly connected to the top wall of the oxygen aeration disc 901, and the outlet end of the oxygen aeration head 902 is located in the inner cavity of the spiral cylinder 601. The air inlet pipe of the oxygen aeration head 902 passes through the bottom wall of the spiral cylinder 601 and connects to the oxygen aeration disc 901. After entering from the oxygen aeration disc 901, the oxygen can be sprayed upward from each group of oxygen aeration heads 902, and after passing through the through hole of the spiral baffle 604, it enters the iron-carbon sintered porous ceramic filler 605 and the sewage.

[0019] The specific structure of the water distributor 3 installed at the bottom of the main tank 201 is as follows: Figure 3 As shown, the main water inlet pipe 301 passes through the bottom wall of the main tank 201 and enters the inner cavity of the iron-carbon micro-electrolysis chamber 208. The branch pipes 302 are evenly connected to the upper side wall of the main water inlet pipe 301. Each branch pipe 302 has evenly distributed water distribution holes 303 in its side wall, so that the sewage entering the main water inlet pipe 301 is evenly distributed into the iron-carbon micro-electrolysis chamber 208 through the water distribution holes 303 of each branch pipe 302. The inlet valve 304 is installed in the inlet end of the main inlet pipe 301 to control the flow rate of wastewater entering the iron-carbon micro-electrolysis chamber 208. The inlet flow rate is set by the control system according to the designed treatment capacity. When the actual inlet flow rate exceeds the design value, the control system automatically adjusts the opening of the inlet valve 304 to maintain the flow rate entering the device within the design range, ensuring that the treatment capacity of each chamber is not lower than the minimum limit. When the inlet flow rate is insufficient, the control system maintains low flow operation to ensure the treatment effect. Furthermore, a buffer tank can be installed at the inlet end of the main water inlet pipe 301, and the regulating tank can be used to smooth out peak and valley water flows. During peak periods, excess water is stored in the buffer tank, and during off-peak periods, the buffer tank is used to replenish the water flow, so that the flow rate entering the main tank 201 remains relatively stable.

[0020] The specific structure of the sedimentation separation component 7 installed in the sedimentation separation chamber 211 is as follows: Figure 2 and Figure 6 As shown, the outer wall of the inlet end of the guide tube 701 is fixedly connected to the third partition 205, and the inlet end of the guide tube 701 extends downward into the inner middle of the spiral tube 601 after passing through the third partition 205, so that the inlet of the guide tube 701 is connected to the central outlet of the spiral tube 601. The wide-flow cone head 702 is connected to the top outlet of the guide tube 701. A fixed sleeve 704 is fixedly connected to the center of the lower end of the cone-shaped mud hopper 703. The fixed sleeve 704 is fixed to the outer wall of the guide tube 701. An eccentric interface 705 is provided at the eccentric part of the bottom end of the cone-shaped mud hopper 703. The mud discharge pipe 706 passes through the side wall of the main tank 201 and communicates with the eccentric interface 705. The sludge discharge valve 707 is installed in the sludge discharge end of the sludge discharge pipe 706; Furthermore, the height of the wide-flow cone 702 is higher than that of the conical sludge hopper 703, and the height of the drain pipe 206 is higher than that of the wide-flow cone 702. This causes the treated wastewater to be refracted by the wide-flow cone 702 and flow downwards, forming a sedimentation zone inside the conical sludge hopper 703. The area of ​​height difference between the drain pipe 206 and the wide-flow cone 702 is the clear water zone. In fact, the water above the conical sludge hopper 703 is basically clear, but a small amount of tiny flocs still float slowly to the surface. The clear water zone provides an additional safety height to ensure that the supernatant discharged from the drain pipe 206 meets the standards.

[0021] Example 2: Examples of specific connection methods for the nitrogen generating unit 10 of the present invention Figure 1 and Figure 11 As shown; The air compressor 1001, PSA nitrogen generator 1002, and nitrogen buffer tank 1003 in the nitrogen generation unit 10 are all fixedly installed on the top surface of the base frame 1. The air inlet of the air compressor 1001 is connected to the atmosphere, and the air outlet of the air compressor 1001 is connected to the air inlet of the PSA nitrogen generator 1002, which is used to pressurize the outside air and send it into the PSA nitrogen generator 1002; the working pressure of the air compressor 1001 is 0.6-0.8 MPa. The PSA nitrogen generator 1002 is equipped with a nitrogen outlet and an exhaust gas outlet. The nitrogen outlet outputs nitrogen gas, and the exhaust gas outlet outputs oxygen-enriched gas. The PSA nitrogen generator 1002 adopts the carbon molecular sieve adsorption separation principle. Under pressure, the carbon molecular sieve preferentially adsorbs oxygen molecules in the air, and nitrogen gas is discharged as the product gas through the adsorption bed. The separation accuracy is that the nitrogen purity is ≥99%. The nitrogen production rate is set to 0.4-0.8 m³ based on the anti-deposition stirring requirements of the anaerobic phosphorus release chamber 209. 3 / h; When adsorption is saturated, the PSA nitrogen generator 1002 automatically switches to depressurization desorption mode, releasing the adsorbed oxygen molecules to form oxygen-enriched gas. The oxygen-enriched gas has an oxygen content of 30%-40%, which is supplied to the micro-oxygen denitrification chamber 210 as a by-product gas. The nitrogen outlet of the PSA nitrogen generator 1002 is connected to the air inlet of the nitrogen buffer tank 1003, and the air outlet of the nitrogen buffer tank 1003 is connected to the air inlet of the nitrogen aeration disc 801, so that the nitrogen is supplied to the nitrogen aeration disc 801 after being stabilized by the nitrogen buffer tank 1003. The nitrogen buffer tank 1003 has a volume of 0.05-0.1 m³. 3 The working pressure is 0.1-0.15MPa. It is used to eliminate the airflow pulsation generated during the pressure swing adsorption process of the PSA nitrogen generator 1002, so that the nitrogen supplied to the nitrogen aeration disc 801 maintains a stable pressure and flow rate, and avoids the airflow fluctuation causing uneven stirring intensity in the anaerobic phosphorus release chamber 209, which affects the sludge suspension effect. The exhaust outlet of the PSA nitrogen generator 1002 is connected to the air inlet of the oxygen aeration disc 901, so that the oxygen-enriched gas is directly supplied to the oxygen aeration disc 901 and each oxygen aeration head 902. Since the oxygen-enriched gas has an oxygen content of 30%-40%, which is lower than the concentration of pure oxygen, the dissolved oxygen in the micro-oxygen denitrification chamber 210 can be naturally maintained in the micro-oxygen range of 0.3-0.5 mg / L. This eliminates the need for an additional gas dilution device to meet the requirements of short-range nitrification coupled with anaerobic ammonia oxidation for a low dissolved oxygen environment. At the same time, the oxygen-enriched gas is directly transported using exhaust gas without the need for additional power, achieving zero-emission recovery and utilization of nitrogen production byproducts.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A phosphorus and nitrogen removal reaction device for rural domestic sewage, comprising a treatment tank (2), characterized in that: It also includes a flushing water discharge mechanism (5), a spiral micro-oxygen denitrification component (6), a nitrogen aeration component (8), an oxygen aeration component (9), and a nitrogen generation unit (10). The processing tank section (2) includes a main tank (201). The main tank (201) is provided with an iron-carbon micro-electrolysis chamber (208), an anaerobic phosphorus release chamber (209), a micro-oxygen denitrification chamber (210), and a precipitation separation chamber (211) from bottom to top. The iron-carbon micro-electrolysis chamber (208) is filled with iron-carbon granular filler (4). The counter-flushing water discharge mechanism (5) located in the anaerobic phosphorus release chamber (209) includes a conical water passage cylinder (505), which is connected to the iron-carbon micro-electrolysis chamber (208). A variable diameter cylinder (501) is fixedly connected to the outer wall of the upper end of the conical water passage cylinder (505). A piston (509) is elastically slidably connected to the lower end of the inner cavity of the variable diameter cylinder (501). A pair of first counter-flushing nozzles (502) and second counter-flushing nozzles (503) are evenly connected to the lower end of the side wall of the variable diameter cylinder (501). The outlets of the first counter-flushing nozzles (502) and the second counter-flushing nozzles (503) are directly opposite each other. The spiral micro-oxygen denitrification assembly (6) located in the micro-oxygen denitrification chamber (210) includes a spiral The cylinder (601) is filled with iron-carbon sintered porous ceramic filler (605). The outer inlet of the spiral cylinder (601) is unidirectionally connected to the anaerobic phosphorus release chamber (209). The central outlet of the spiral cylinder (601) is connected to the sedimentation separation chamber (211). The nitrogen aeration component (8) is located in the anaerobic phosphorus release chamber (209), with each outlet facing the bottom of the inner cavity of the anaerobic phosphorus release chamber (209). The oxygen aeration component (9) is located in the micro-oxygen denitrification chamber (210), with each outlet facing upward at the bottom of the spiral cylinder (601). The nitrogen produced by the nitrogen generating unit (10) is supplied to the nitrogen aeration component (8), and the discharged oxygen-enriched gas is supplied to the oxygen aeration component (9).

2. The phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 1, characterized in that: The processing tank (2) also includes a foot (202), a first partition (203), a second partition (204), a third partition (205), and a drain valve (207). The first partition (203), the second partition (204), and the third partition (205) are fixed to the inner wall of the main tank (201) from bottom to top. A base frame (1) is provided below the main tank (201). The foot (202) is evenly fixed to the outer bottom of the main tank (201), and the bottom end of the foot (202) is fixed to the top end of the base frame (1). A drain pipe (206) is connected to the upper end of the side wall of the main tank (201), and the drain valve (207) is installed in the drain pipe (206).

3. The phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 2, characterized in that: The counter-flushing water discharge mechanism (5) also includes a guide plate (507), a conical water passage cylinder (505) integrally formed with the first partition plate (203), and the large conical end of the conical water passage cylinder (505) facing the side of the first partition plate (203), the outer wall of the small conical end being fixed to the bottom end of the variable diameter cylinder (501), the top end of the variable diameter cylinder (501) being fixed to the bottom surface of the second partition plate (204), a guide slide cylinder (510) being fixed in the middle of the bottom surface of the second partition plate (204), and a guide slide column (506) being slidably connected inside the guide slide cylinder (510). (507) is fixed to the bottom end of the guide column (506), the piston (509) is installed and fixed to the bottom end of the guide plate (507), and a compression spring (508) is sleeved on the outside of the guide cylinder (510). One end of the compression spring (508) is fixed to the top surface of the guide plate (507), and the other end is fixed to the bottom surface of the second partition (204). The lower end of the side wall of the variable diameter cylinder (501) is also evenly connected with anti-settling nozzles (504). The outlet of the anti-settling nozzles (504) also faces the bottom surface of the inner cavity of the anaerobic phosphorus release chamber (209).

4. The phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 3, characterized in that: The spiral micro-oxygen denitrification assembly (6) also includes a water inlet pipe (602) and a one-way valve (603). One end of the water inlet pipe (602) is connected to the outer wall of the spiral cylinder (601), and the other end passes through the second partition (204) and enters the inner cavity of the anaerobic phosphorus release chamber (209). The one-way valve (603) is installed in the water inlet pipe (602). The spiral partition (604) is fixedly connected to the lower inner end of the spiral cylinder (601). Iron-carbon sintered porous ceramic filler (605) is filled in the spiral cylinder (601) located above the spiral partition (604). The top of the spiral cylinder (601) is fixedly connected to the bottom surface of the third partition (205).

5. A phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 2, 3, or 4, characterized in that: The nitrogen aeration assembly (8) includes a nitrogen aeration disc (801) and a nitrogen nozzle (803). The nitrogen aeration disc (801) passes through the side wall of the main tank (201) and enters the inner cavity of the anaerobic phosphorus release chamber (209). The nitrogen nozzle (803) is evenly connected to the bottom wall of the nitrogen aeration disc (801) and the position directly opposite the first partition (203). A branch pipe (802) is also evenly fixed between the bottom outer wall of the nitrogen aeration disc (801) and the top surface of the first partition (203).

6. The phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 5, characterized in that: The oxygen aeration assembly (9) includes an oxygen aeration disc (901) and an oxygen aeration head (902). The oxygen aeration disc (901) passes through the side wall of the main tank (201) and enters the inner cavity of the micro-oxygen denitrification chamber (210). The oxygen aeration head (902) is evenly connected to the top wall of the oxygen aeration disc (901), and the outlet end of the oxygen aeration head (902) is located in the inner cavity of the spiral cylinder (601). The air inlet pipe of the oxygen aeration head (902) passes through the bottom wall of the spiral cylinder (601) and connects to the oxygen aeration disc (901).

7. The phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 6, characterized in that: The nitrogen generation unit (10) includes an air compressor (1001), a PSA nitrogen generator (1002), and a nitrogen buffer tank (1003). The air compressor (1001), the PSA nitrogen generator (1002), and the nitrogen buffer tank (1003) are all fixedly installed on the top surface of the base frame (1). The air inlet of the air compressor (1001) is connected to the atmosphere, and the air outlet of the air compressor (1001) is connected to the air inlet of the PSA nitrogen generator (1002). The PSA nitrogen generator (1002) is equipped with a nitrogen outlet and an exhaust outlet. The nitrogen outlet outputs nitrogen gas, and the exhaust outlet outputs oxygen-enriched gas. The nitrogen outlet of the PSA nitrogen generator (1002) is connected to the air inlet of the nitrogen buffer tank (1003). The air outlet of the nitrogen buffer tank (1003) is connected to the air inlet of the nitrogen aeration disc (801). The exhaust outlet of the PSA nitrogen generator (1002) is connected to the air inlet of the oxygen aeration disc (901).

8. A phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 1, 2, 3, 4, 6 or 7, characterized in that: It also includes a water distributor (3), which includes a main water inlet pipe (301), branch pipes (302) and a water inlet valve (304). The main water inlet pipe (301) passes through the bottom wall of the main tank (201) and enters the inner cavity of the iron-carbon micro-electrolysis chamber (208). The branch pipes (302) are evenly connected to the upper side wall of the main water inlet pipe (301). Each branch pipe (302) has a water distribution hole (303) evenly opened in the side wall, so that the sewage entering the main water inlet pipe (301) is evenly distributed into the iron-carbon micro-electrolysis chamber (208) through the water distribution hole (303) of each branch pipe (302). The water inlet valve (304) is installed in the pipeline at the water inlet end of the main water inlet pipe (301).

9. A phosphorus and nitrogen removal reaction device for rural domestic sewage according to claim 2, 3, 4, 6 or 7, characterized in that: It also includes a sedimentation separation component (7), which includes a guide tube (701), a broad-flow cone (702), a conical sludge hopper (703), a fixed sleeve (704), a sludge discharge pipe (706), and a sludge discharge valve (707). The outer wall of the inlet end of the guide tube (701) is fixedly connected to the third partition (205), and the inlet end of the guide tube (701) extends downward into the inner middle of the spiral cylinder (601) after passing through the third partition (205). The broad-flow cone (702) is also included. 2) A fixed sleeve (704) is fixed at the center of the lower end of the conical mud hopper (703) connected to the top outlet of the guide tube (701). The fixed sleeve (704) is fixed to the outer wall of the guide tube (701). An eccentric interface (705) is provided at the eccentric part of the bottom end of the conical mud hopper (703). The mud discharge pipe (706) passes through the side wall of the main tank (201) and communicates with the eccentric interface (705). The mud discharge valve (707) is installed in the mud discharge end pipeline of the mud discharge pipe (706).

Images