Recycling treatment and utilization device for rural domestic sewage

Abstract

The invention relates to the technical field of sewage treatment, and discloses a rural domestic sewage circulation treatment and utilization device, which comprises a plurality of purification units and a treatment center, each purification unit is connected with the sewage discharge end of each household, a plurality of adjacent purification units share one treatment center, each purification unit comprises a pretreatment bin and a purification bin, cyclic heating cavities are formed in bin bodies of the pretreatment bin and the purification bin, sewage firstly enters the pretreatment bin to be subjected to preliminary anaerobic decomposition and homogenization and then enters the purification bin to be further degraded and purified, and each purification unit is provided with a heating assembly in a matched mode. And the environment temperature in the purification unit is kept in a temperature range suitable for the survival of strains by burning the biogas to generate heat. The treatment center collects the biogas generated by the purification unit of each household in a centralized manner, and distributes the biogas according to actual conditions, so that the problem that the purification units are damaged by low temperature is avoided, the activity of strains in the purification units is ensured, and the sewage treatment efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a circulating treatment and utilization device for rural domestic sewage. Background Art

[0002] In rural areas, with rising living standards, the amount of domestic sewage generated is increasing, but existing sewage treatment facilities suffer from numerous drawbacks. The conversion of dry toilets to flush toilets has led to the indiscriminate discharge of large amounts of untreated domestic sewage, deteriorating the water quality in ditches and ponds, turning them black and smelly, breeding mosquitoes, and severely contaminating drinking water sources. This has led to eutrophication of lakes and reservoirs, posing a threat to the rural ecological environment and the health of residents. Furthermore, existing sewage tanks are difficult to clean, making it difficult for cleaning vehicles to access narrow rural roads and expensive to clean. Furthermore, septic tanks quickly fill up, requiring frequent cleaning, which has caused significant dissatisfaction among farmers and further exacerbated the difficulties faced by rural sewage treatment.

[0003] Traditional three-compartment septic tanks suffer from unstable treatment performance and poor adaptability to water volume, making it difficult to maintain effective treatment in the face of fluctuating sewage volumes. They also have low shock resistance and are susceptible to fluctuations in sewage quality and volume, leading to decreased treatment efficiency. Septic tanks on the market vary in quality and price, and are generally frost-resistant in northern cold regions, making them susceptible to damage in low temperatures and unable to meet the needs of local rural domestic sewage treatment. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present invention provides a circulating treatment and utilization device for rural domestic sewage, which solves the problems of poor treatment efficiency and poor frost resistance of existing rural domestic sewage.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a circulating treatment and utilization device for rural domestic sewage, comprising multiple purification units and a treatment center, each of the purification units is connected to the sewage discharge end of each household, and multiple adjacent purification units share a treatment center, the purification unit includes a pretreatment chamber and a purification chamber, both of which are provided with a circulating heating chamber, the sewage first enters the pretreatment chamber for preliminary anaerobic decomposition and homogenization, and then enters the purification chamber for further degradation and purification, each purification unit is equipped with a heating component, and the heat generated by burning biogas is used to keep the ambient temperature in the purification unit within a temperature range suitable for the survival of the bacteria, the treatment center includes a biogas collection unit, a biogas storage unit and a biogas distribution unit, the biogas collection unit is connected to the exhaust port of the pretreatment chamber through a biogas collection pipe, and is used to collect the gas discharged from the pretreatment chamber and inject the collected gas into the biogas storage unit for storage, the biogas distribution unit is respectively connected to the heating component and the aeration end of the pretreatment chamber, and is used to quantitatively distribute the biogas stored in the biogas storage unit to the heating component and the aeration end of the pretreatment chamber.

[0006] Preferably, the purification unit is buried below the freezing line, and a heat insulation layer and a pressure-resistant layer are added to the outside of the purification unit.

[0007] Preferably, the pretreatment tank includes a manure tank and a regulating tank, a partition plate is provided between the two, and an overflow port is opened at the top of the partition plate. The upper part of the manure tank and the regulating tank is a gas collecting chamber, and the bottom of the manure tank and the regulating tank are both provided with an aeration unit. Domestic sewage enters the manure tank, and is treated with anaerobic fermentation to treat parasite eggs and degrade organic matter. As the water level rises, it enters the regulating tank through the overflow port for homogenization adjustment. Part of the biogas enters the manure tank and the bottom of the regulating tank respectively through the aeration unit. As the biogas rises, the sewage inside the two is stirred, and after mixing with the newly generated biogas, it enters the biogas collection unit through the biogas collection pipe.

[0008] Preferably, part of the biogas collection pipe is located above the freezing line and is provided with a water collector for collecting water generated by biogas condensation.

[0009] Preferably, the purification tank includes a multi-stage degradation tank and a clear water tank, a partition plate 2 is provided between the two, and an overflow port 2 is opened at the top of the partition plate 2, the bottom of the multi-stage degradation tank is connected to the upper part of the regulating tank through a pipe, the multi-stage degradation tank adopts a mud film symbiosis process, and forms an anoxic and aerobic multi-stage alternating degradation structure in the multi-stage degradation tank, and the homogenized sewage is biodegraded and denitrified. The clear water tank adopts a static sedimentation process, and an immersion disinfection tank is provided in the clear water tank, and the clear water after precipitation is disinfected by ultraviolet disinfection.

[0010] Preferably, the heating component includes a circulation unit and a biogas combustion heating unit. Part of the biogas is allocated to the biogas combustion heating unit for combustion. After the water is heated by the biogas combustion heating unit, it is transported to the circulation heating chamber through the circulation unit to form a circulation heating mode.

[0011] Preferably, each anoxic area and aerobic area in the multi-stage degradation chamber is also provided with an aeration unit, wherein the aeration unit in the anoxic area in the multi-stage degradation chamber is connected to the exhaust end of the biogas combustion heating unit, and the waste gas after biogas combustion enters the anoxic area in the multi-stage degradation chamber, and the aeration unit in the aerobic area in the multi-stage degradation chamber is connected to the air supply equipment, and the outside air enters the aerobic area in the multi-stage degradation chamber.

[0012] The present invention provides a device for recycling and treating rural domestic sewage. It has the following beneficial effects:

[0013] The present invention collects the biogas generated by each household's purification unit in a centralized manner through a processing center, and distributes the use of the biogas according to actual conditions. On the one hand, the biogas is used to aerate and stir the sewage in the pretreatment bin, thereby driving the flow and mixing of the sewage, so that the pollutants, microorganisms and added treatment agents in the sewage can contact and react more fully, thereby improving the sewage treatment efficiency; on the other hand, the heat generated by burning the biogas by the heating component and heating it in the circulating heating chamber is maintained in the temperature range suitable for the survival of the bacteria. This not only avoids the problem of the purification unit being damaged by low temperature, but also ensures the activity of the bacteria in the purification unit, further improving the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the system structure of a circulating treatment and utilization device for rural domestic sewage according to the present invention;

[0015] Figure 2 Schematic diagram of the system structure of the processing center in the present invention;

[0016] Figure 3 Schematic diagram of the system structure of the purification unit in the present invention;

[0017] Figure 4 Schematic diagram of the system structure of the heating component in the present invention.

[0018] Among them, 10, purification unit; 101, pretreatment chamber; 1011, manure tank; 1012, regulating chamber; 1013, partition one; 1014, overflow port one; 1015, gas collecting chamber; 102, purification chamber; 1021, multi-stage degradation chamber; 1022, clean water chamber; 1023, partition two; 1024, overflow port two; 103, circulating heating chamber; 20, processing center; 201, biogas collection unit; 202, biogas storage unit; 203, biogas distribution unit; 204, biogas collection pipe; 30, heating component; 301, circulation unit; 302, biogas combustion heating unit. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Please see the attached Figure 1 -Attached Figure 4The embodiment of the present invention provides a recycling treatment and utilization device for rural domestic sewage, including multiple purification units 10 and a treatment center 20. Each purification unit 10 is connected to the sewage discharge end of each household. Multiple adjacent purification units 10 share a treatment center 20. The purification unit 10 includes a pretreatment chamber 101 and a purification chamber 102. Both chambers are provided with a circulating heating chamber 103. The sewage first enters the pretreatment chamber 101 for preliminary anaerobic decomposition and homogenization, and then enters the purification chamber 102 for further degradation and purification. Each purification unit 10 is equipped with a heating component 30, which generates heat by burning biogas to make the purification unit 1 0 is maintained within a temperature range suitable for the survival of the bacteria. The processing center 20 includes a biogas collection unit 201, a biogas storage unit 202 and a biogas distribution unit 203. The biogas collection unit 201 is connected to the exhaust port of the pretreatment chamber 101 through a biogas collection pipe 204, and is used to collect the gas discharged from the pretreatment chamber 101 and inject the collected gas into the biogas storage unit 202 for storage. The biogas distribution unit 203 is respectively connected to the heating component 30 and the aeration end of the pretreatment chamber 101, and is used to quantitatively distribute the biogas stored in the biogas storage unit 202 to the heating component 30 and the aeration end of the pretreatment chamber 101.

[0021] The rural domestic sewage recycling system primarily consists of multiple purification units 10 and a treatment center 20. Each purification unit 10 is precisely connected to each household's sewage outlet, and multiple adjacent purification units 10 are connected to a single treatment center 20, enabling centralized and scaled treatment.

[0022] The purification unit 10 is further divided into a pretreatment chamber 101 and a purification chamber 102. Both chambers are uniquely designed with a circulating heating chamber 103. The entire sewage treatment process is that the sewage first flows into the pretreatment chamber 101, where the initial anaerobic decomposition and homogenization treatment process is started. In this process, the complex organic matter in the sewage is slowly decomposed by anaerobic microorganisms in an oxygen-free environment, and the various components gradually become uniform. After completing the preliminary treatment, the sewage then enters the purification chamber 102 for further degradation and deep purification. To ensure the stable operation of the system, each purification unit 10 is equipped with a heating component 30. Its operating principle is to generate heat by burning biogas, and then cleverly use the heat in the circulating heating chamber 103, so that the inside of the purification unit 10 is always maintained in a temperature range suitable for the survival and reproduction of the bacteria. This is crucial for sewage treatment. It not only avoids the hidden danger of low temperature damaging the purification unit 10, but also ensures the activity of the bacteria. At the same time, the use of biogas also plays a role in energy conservation and emission reduction, reducing the loss of electricity. The processing center 20 serves as the hub of the entire system, covering the biogas collection unit 201, the biogas storage unit 202 and the biogas distribution unit 203. The biogas collection unit 201 is closely connected to the exhaust port of the pre-treatment chamber 101 by means of the biogas collection pipe 204. Its core responsibility is to accurately collect the gas discharged from the pre-treatment chamber 101, and then steadily inject the collected gas into the biogas storage unit 202 for storage. The biogas distribution unit 203 plays a key allocation function. On the one hand, it is connected to the heating component 30, and on the other hand, it is connected to the aeration end of the pre-treatment chamber 101. The purpose is to quantitatively distribute the biogas stored in the biogas storage unit 202 to the heating component 30 and the aeration end of the pre-treatment chamber 101 according to actual needs.

[0023] From the perspective of practical application, the treatment center 20 collects the biogas produced by each household's purification unit 10 and flexibly adjusts the use of the biogas according to the actual working conditions. This solves the problem of insufficient biogas production in a single household. On the one hand, the biogas is transported to the aeration end of the pretreatment chamber 101, and the sewage in the pretreatment chamber 101 is stirred by biogas aeration. As the biogas bubbles rise in the sewage, they will strongly drive the flow and mixing of the sewage, so that the pollutants, microorganisms and subsequent added treatment agents in the sewage can contact and react in an all-round and deep manner, greatly improving the efficiency of sewage treatment. On the other hand, the heat generated by the combustion of biogas by the heating component 30 builds a stable heating circulation mode in the circulating heating chamber 103, ensuring that the temperature in the purification unit 10 is appropriate.

[0024] The biogas generated by each household's purification unit 10 is collected centrally by the treatment center 20, and the use of the biogas is allocated according to actual conditions. On the one hand, the biogas is used to aerate and stir the sewage in the pretreatment chamber 101, thereby driving the flow and mixing of the sewage, so that the pollutants, microorganisms and added treatment agents in the sewage can contact and react more fully, thereby improving the sewage treatment efficiency; on the other hand, the heat generated by burning the biogas by the heating component 30 and heating the circulating heating chamber 103 is maintained in the temperature range suitable for the survival of the bacteria. This not only avoids the problem of the purification unit 10 being damaged by low temperature, but also ensures the activity of the bacteria in the purification unit 10, further improving the sewage treatment efficiency.

[0025] By centrally collecting and intelligently supplying biogas from multiple households, biogas can be used efficiently and effectively. Furthermore, in actual construction, the system can also be connected to septic tanks in places like livestock farms to centrally collect the large amounts of biogas they produce, completely solving the problem of biogas shortages. Furthermore, clean energy sources such as solar energy can be used to supplement biogas shortages.

[0026] The purification unit 10 is buried below the freezing line, and a heat insulation layer and a pressure-resistant layer are added outside the purification unit 10 .

[0027] In terms of installation details, the purification unit 10 is buried below the freezing line, and a thermal insulation layer and a pressure-resistant layer are added to the outside of the purification unit 10. This design not only prevents the purification unit 10 from being corroded by low temperatures, but also enhances its pressure resistance, enabling it to operate stably and long-term in complex underground environments.

[0028] The pretreatment tank 101 includes a manure tank 1011 and a regulating tank 1012, with a partition 1013 provided therebetween, and an overflow port 1014 provided at the top of the partition 1013. The upper part of the manure tank 1011 and the regulating tank 1012 is a gas collecting chamber 1015, and the bottom of the manure tank 1011 and the regulating tank 1012 are both provided with an aeration unit. Domestic sewage enters the manure tank 1011, and is treated with anaerobic fermentation to treat parasite eggs and degrade organic matter. As the water level rises, it enters the regulating tank 1012 through the overflow port 1014 for homogenization and adjustment. Part of the biogas enters the bottom of the manure tank 1011 and the regulating tank 1012 respectively through the aeration unit. As the biogas rises, the sewage inside the two is stirred, and after mixing with the newly generated biogas, it enters the biogas collection unit 201 through the biogas collection pipe 204.

[0029] The pretreatment tank 101 is further divided into a manure tank 1011 and a regulating tank 1012, which are separated by a partition 1013, and an overflow port 1014 is precisely opened at the top of the partition 1013. An air collecting chamber 1015 is constructed above the interior of the manure tank 1011 and the regulating tank 1012, and an aeration unit is installed at the bottom of both. After the domestic sewage flows into the manure tank 1011, the anaerobic fermentation process is started, which specifically treats the parasite eggs in the sewage and gradually degrades the organic matter. As the sewage level gradually rises, it will flow smoothly into the regulating tank 1012 through the overflow port 1014 for homogenous adjustment. During this period, part of the biogas is injected into the bottom of the manure tank 1011 and the regulating tank 1012 respectively by the aeration unit. During the rising process of the biogas, it not only stirs the sewage, but also promotes the mixing of the newly generated biogas with it, and finally enters the biogas collection unit 201 smoothly through the biogas collection pipe 204.

[0030] Part of the biogas collection pipe 204 is located above the freezing line and is equipped with a water collector for collecting water generated by condensation of biogas.

[0031] Because part of the biogas collection pipe 204 is located above the freezing point, when the biogas mixed with water vapor flows through the biogas collection pipe 204, the water vapor condenses under the influence of cold weather, forming liquefied water that enters the water collector. The water in the water collector can be transferred back to the pretreatment chamber 101 or to the purification chamber 102.

[0032] The purification chamber 102 includes a multi-stage degradation chamber 1021 and a clean water chamber 1022, with a partition 1023 provided therebetween, and an overflow port 1024 provided at the top of the partition 1023. The bottom of the multi-stage degradation chamber 1021 is connected to the upper part of the regulating chamber 1012 through a pipe. The multi-stage degradation chamber 1021 adopts a mud film symbiotic process to form an anoxic and aerobic multi-stage alternating degradation structure in the multi-stage degradation chamber 1021, and the homogenized sewage is biodegraded and denitrified. The clean water chamber 1022 adopts a static sedimentation process, and an immersion disinfection tank is provided in the clean water chamber 1022 to disinfect the clean water after precipitation by ultraviolet disinfection.

[0033] Purification chamber 102 consists of a multi-stage degradation chamber 1021 and a clean water chamber 1022, separated by a partition 1023. An overflow port 1024 is located at the top of partition 1023. The bottom of multi-stage degradation chamber 1021 is seamlessly connected to the upper portion of conditioning chamber 1012 via a pipe. Multi-stage degradation chamber 1021 utilizes an advanced mud-film symbiotic process, creating a multi-stage alternating anoxic and aerobic degradation structure within the chamber, enabling efficient biodegradation and precise denitrification of homogenized wastewater. Clean water chamber 1022 utilizes a static sedimentation process and is equipped with an immersion disinfection tank, which utilizes ultraviolet disinfection to thoroughly disinfect the settled clean water, ensuring that the effluent meets quality standards.

[0034] The heating component 30 includes a circulation unit 301 and a biogas combustion heating unit 302. Part of the biogas is allocated to the biogas combustion heating unit 302 for combustion. After the water is heated by the biogas combustion heating unit 302, it is transported to the circulation heating chamber 103 through the circulation unit 301 to form a circulation heating mode.

[0035] Each anoxic area and aerobic area in the multi-stage degradation chamber 1021 is also provided with an aeration unit, wherein the aeration unit in the anoxic area in the multi-stage degradation chamber 1021 is connected to the exhaust end of the biogas combustion heating unit 302, and the waste gas after biogas combustion enters the anoxic area in the multi-stage degradation chamber 1021. The aeration unit in the aerobic area in the multi-stage degradation chamber 1021 is connected to the air supply equipment, and the outside air enters the aerobic area in the multi-stage degradation chamber 1021.

[0036] The heating assembly 30 consists of a circulation unit 301 and a biogas combustion heating unit 302. A portion of the biogas is precisely distributed to the biogas combustion heating unit 302 for combustion. After the water is heated by the biogas combustion heating unit 302, it is rapidly transported to the circulating heating chamber 103 through the circulation unit 301, successfully establishing a circulating heating mode and ensuring temperature stability within the purification unit 10. At the same time, aeration units are also provided for each anoxic zone and aerobic zone within the multi-stage degradation chamber 1021. The aeration units in the anoxic zones of the multi-stage degradation chamber 1021 are connected to the exhaust ports of the biogas combustion heating unit 302, allowing waste gas from biogas combustion to enter the anoxic zones within the multi-stage degradation chamber 1021 for utilization. The aeration units in the aerobic zones of the multi-stage degradation chamber 1021 are connected to the air supply equipment, ensuring that external air can smoothly enter the aerobic zones within the multi-stage degradation chamber 1021, providing sufficient oxygen for the microorganisms and ensuring the smooth progress of the biodegradation process.

[0037] Of course, the entire wastewater recycling system relies on the support of a control system. This system utilizes an intelligent operating model combining fully automatic operation with unattended operation and remote real-time monitoring, connecting the region's wastewater treatment equipment to the "Industrial Internet Digital Centralized Management and Control Platform." Intelligent data collection equipment collects real-time data on wastewater quality (such as COD, ammonia nitrogen, and total phosphorus), water volume, and equipment operating status (such as pump speed, valve opening and closing status, and aeration intensity). Based on local cold weather (or other special climates such as high temperatures and plateaus) and residents' water usage patterns, AI-powered cloud computing analysis is used to develop customized optimal operating procedures for each household or groups. The remote control system automatically drives the equipment based on the analysis results, ensuring that rural domestic wastewater treatment requires no on-site intervention and maintains optimal treatment conditions over the long term. It also monitors biogas collection data in real time and ensures precise allocation of biogas for optimal utilization. Furthermore, clean energy components such as solar energy can be added to provide additional energy when biogas levels are insufficient.

[0038] The system platform also utilizes multi-faceted data interaction and management: users can monitor the system in real time via mobile phones, computers, and other terminals, viewing sewage quality curves, equipment operating parameter charts, historical data records, and other information at any time. When a system malfunction or water quality abnormality occurs, the terminal receives an alert, allowing timely action. The platform also boasts powerful statistical analysis capabilities, enabling in-depth analysis of regional sewage discharge volume, treatment efficiency, energy consumption, and other data. This provides scientific data-driven decision-making support for rural sewage treatment planning and equipment optimization and upgrades, enabling digital, intelligent, and convenient operations and maintenance management.

[0039] The actual operating effect of the above-mentioned rural domestic sewage recycling treatment and utilization device was tested. The water quality was tested at the water inlet and outlet of the system respectively, and a total of three samplings were carried out. The specific results are shown in the following table:

[0040] Sampling time: November 21, 2024:

[0041]

[0042]

[0043] Sampling time: December 5, 2024

[0044]

[0045] Sampling time: December 16, 2024

[0046]

[0047]

[0048] Sampling time: January 8, 2025

[0049]

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A circulating treatment and utilization device for rural domestic sewage, comprising a plurality of purification units (10) and a treatment center (20), characterized in that: Each of the purification units (10) is connected to the sewage discharge end of each household, and a plurality of adjacent purification units (10) share a processing center (20). The purification unit (10) includes a pretreatment chamber (101) and a purification chamber (102), both of which are provided with a circulating heating chamber (103). The sewage first enters the pretreatment chamber (101) for preliminary anaerobic decomposition and homogenization, and then enters the purification chamber (102) for further degradation and purification. Each purification unit (10) is equipped with a heating component (30), which generates heat by burning biogas to keep the ambient temperature in the purification unit (10) within a temperature range suitable for the survival of the bacteria. The center (20) includes a biogas collection unit (201), a biogas storage unit (202) and a biogas distribution unit (203). The biogas collection unit (201) is connected to the exhaust port of the pretreatment chamber (101) through a biogas collection pipe (204) and is used to collect gas discharged from the pretreatment chamber (101) and inject the collected gas into the biogas storage unit (202) for storage. The biogas distribution unit (203) is respectively connected to the heating component (30) and the aeration end of the pretreatment chamber (101) and is used to quantitatively distribute the biogas stored in the biogas storage unit (202) to the heating component (30) and the aeration end of the pretreatment chamber (101).

2. The device for recycling and treating rural domestic sewage according to claim 1, characterized in that: The purification unit (10) is buried below the freezing line, and a heat insulation layer and a pressure-resistant layer are added outside the purification unit (10).

3. The circulating treatment and utilization device for rural domestic sewage according to claim 1 is characterized in that: The pretreatment chamber (101) includes a manure chamber (1011) and a regulating chamber (1012), a partition (1013) is provided between the two, and an overflow port (1014) is provided at the top of the partition (1013). The manure chamber (1011) and the regulating chamber (1012) are provided with an air collecting chamber (1015) at the top, and an aeration unit is provided at the bottom of the manure chamber (1011) and the regulating chamber (1012). 1011), parasite eggs are treated by anaerobic fermentation and organic matter is degraded. As the water level rises, the biogas flows from the overflow port 1 (1014) into the regulating chamber (1012) for homogenization. Part of the biogas flows from the aeration unit into the bottom of the manure tank (1011) and the regulating chamber (1012). As the biogas rises, the sewage inside the two chambers is stirred and mixed with the newly generated biogas before entering the biogas collection unit (201) through the biogas collection pipe (204).

4. The circulating treatment and utilization device for rural domestic sewage according to claim 3 is characterized in that: Part of the biogas collection pipe (204) is located above the freezing line and is equipped with a water collector for collecting water generated by biogas condensation.

5. The circulating treatment and utilization device for rural domestic sewage according to claim 3 is characterized in that: The purification chamber (102) includes a multi-stage degradation chamber (1021) and a clean water chamber (1022), with a second partition (1023) provided between the two, and a second overflow port (1024) provided at the top of the second partition (1023). The bottom of the multi-stage degradation chamber (1021) is connected to the upper part of the regulating chamber (1012) through a pipeline. The multi-stage degradation chamber (1021) adopts a mud film symbiotic process to form an anoxic and aerobic multi-stage alternating degradation structure in the multi-stage degradation chamber (1021), and biodegrades and denitrifies the homogenized sewage. The clean water chamber (1022) adopts a static sedimentation process, and an immersion disinfection tank is provided in the clean water chamber (1022), and the clean water after sedimentation is disinfected by ultraviolet disinfection.

6. The circulating treatment and utilization device for rural domestic sewage according to claim 5, characterized in that: The heating component (30) comprises a circulation unit (301) and a biogas combustion heating unit (302); part of the biogas is distributed to the biogas combustion heating unit (302) for combustion; water is heated by the biogas combustion heating unit (302) and then transported to the circulation heating chamber (103) through the circulation unit (301) to form a circulation heating mode.

7. The device for recycling and treating rural domestic sewage according to claim 6, characterized in that: Each anoxic area and aerobic area in the multi-stage degradation chamber (1021) is also provided with an aeration unit, wherein the aeration unit in the anoxic area in the multi-stage degradation chamber (1021) is connected to the exhaust end of the biogas combustion heating unit (302), and the waste gas after the biogas combustion enters the anoxic area in the multi-stage degradation chamber (1021); the aeration unit in the aerobic area in the multi-stage degradation chamber (1021) is connected to the air supply equipment, and the outside air enters the aerobic area in the multi-stage degradation chamber (1021).

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