A device and method for treating and utilizing rural domestic sewage

Abstract

This invention belongs to the field of ecological environmental protection. It discloses a rural domestic sewage treatment and resource utilization device, including a primary biological treatment tank, a secondary biological treatment tank, and a reclaimed water tank. An grease trap is detachably installed on one side of the upper part of the primary biological treatment tank. The surface of the grease trap wall is uniformly perforated with grease-separating micropores. The remaining space of the primary biological treatment tank is a supernatant tank. An inlet pipe is installed at the top of one side of the outer wall of the primary biological treatment tank, connecting to the grease trap. This invention features a top-inlet, bottom-outlet plug-flow water inlet, effectively avoiding short-flow situations. The inlet water is evenly distributed through the grease-separating micropores on the side wall of the upper grease trap, and then flows evenly downwards through the suspended packing section, achieving initial and thorough adsorption of pollutants. Subsequently, after passing through the outlet pipe, it flows evenly downwards through the suspended packing, achieving a second thorough adsorption of pollutants. Through this design, the pollutant concentration decreases sequentially along the water flow from the inlet to the outlet.

Description

Technical Field

[0001] This invention belongs to the field of ecological and environmental protection, specifically relating to a device and method for treating and utilizing rural domestic sewage. Background Technology

[0002] Rural domestic sewage discharge exhibits significant variations in volume and quality across different times of day, seasons, and even within a single day. Furthermore, due to the dispersed nature of rural settlements and varying elevations, many areas cannot accommodate centralized collection and treatment networks, necessitating decentralized treatment systems for individual or multiple households. Decentralized treatment systems typically aim for resource recovery, and selectable technologies include large three-compartment septic tanks, decentralized constructed wetlands, multi-stage anaerobic digesters with packing materials, and integrated micro-powered equipment.

[0003] However, large three-compartment septic tanks are bulky, expensive, prone to leakage, and their effluent does not easily meet standards; decentralized constructed wetlands occupy a large area, their filter media is prone to clogging and short-circuiting, the filter media is difficult to wash, and their service life is short; multi-stage anaerobic tanks with packing can remove COD from sewage, but the anaerobic process cannot remove ammonia nitrogen and other pollutants, resulting in a strong odor in the effluent and affecting living hygiene; and micro-power integrated equipment has complex control logic, is difficult to manage and maintain, has high energy consumption, and requires a large initial investment. Therefore, there is an urgent need to design a sewage treatment device to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a device for treating and utilizing rural domestic sewage, aiming to solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rural domestic sewage treatment and resource utilization device includes a primary biological treatment tank, a secondary biological treatment tank, and a reclaimed water tank. An oil separator is detachably installed on the upper side of the primary biological treatment tank, and the surface of the oil separator wall is uniformly provided with oil-separating micropores. The remaining space of the primary biological treatment tank is a supernatant tank. An inlet pipe is installed at the top of one side of the outer wall of the primary biological treatment tank, and the inlet pipe is connected to the oil separator. Suspended packing is installed in the lower part of the supernatant tank. The top of one side of the outer wall of the secondary biological treatment tank is connected to one end of a first effluent pipe, and the other end of the first effluent pipe extends into the supernatant tank near the bottom. Suspended packing is installed in the middle of the secondary biological treatment tank, and its bottom is an aerated sedimentation zone. The top of one side of the outer wall of the reclaimed water tank is connected to one end of a second effluent pipe, and the other end of the second effluent pipe extends into the secondary biological treatment tank and is located above the aerated sedimentation zone. A water reuse device is installed inside the reclaimed water tank.

[0007] Furthermore, the pore size of the oil-separating micropores in the oil separator is 2-5 mm.

[0008] Furthermore, the suspended packing includes a suspended floating bed, which floats on the surface of the supernatant tank. Suspended packing is uniformly suspended at the bottom of the suspended floating bed, and a counterweight plate is suspended at the bottom of the suspended packing.

[0009] Furthermore, an aeration coil is provided at the bottom of the aerated sedimentation zone. The inlet of the aeration coil is connected to one end of the aeration pipe, and the other end of the aeration pipe is connected to the output end of the aeration pump.

[0010] Furthermore, the ratio of the inner cross-sectional diameter to the water depth of both the primary and secondary biological treatment tanks is 1:1 to 1:3.

[0011] Furthermore, the water reuse device includes a reuse water pump, which is fixedly installed at the bottom of the reuse water tank. The reuse water pump is equipped with a float level signal valve. The output end of the reuse water pump is connected to one end of the reuse water pipe, and the other end of the reuse water pipe extends outside the reuse water tank.

[0012] Furthermore, both the recycled water pump and the aeration pump are electrically connected to the recycling system control cabinet via system wiring, and the recycling system control cabinet, the recycled water pump, and the aeration pump are powered by a solar power system.

[0013] A method for using a rural domestic sewage treatment and resource utilization device includes the following steps:

[0014] Step S1: Oil separation and slag removal.

[0015] The oil separator separates the wastewater from oil, removes sludge, and distributes water evenly, creating conditions for the primary biological treatment tank to form a laminar flow state.

[0016] Step S2: Primary treatment of wastewater.

[0017] The primary biological treatment tank is an anaerobic tank, responsible for the initial treatment of sewage. It utilizes anaerobic microorganisms attached to the suspended packing material to fully adsorb and degrade large organic molecules, causing them to hydrolyze, acidify, and undergo anaerobic ammonification, thus initially removing COD from the water.

[0018] Step S3: Advanced treatment of wastewater.

[0019] After preliminary treatment in the anaerobic tank, the wastewater enters the secondary biological treatment tank, which is an anoxic and aerobic tank responsible for the advanced treatment of wastewater. While further reducing COD, it also reduces the concentration of ammonia nitrogen in the water, thereby reducing the odor of the effluent. Through intermittent aeration, the microorganisms attached to the suspended packing are intermittently in an aerobic and anoxic cycle, thereby realizing the simultaneous nitrification and denitrification process.

[0020] Step S4: Water recycling.

[0021] After deep treatment, the sewage flows into the reuse tank for collection. By setting up the reuse device, it can make it more convenient for farmers to use water. The liquid level float valve set in the reuse tank can help realize the high water level alarm reminder to use water and the low water level to stop the pump.

[0022] Furthermore, the intermittent aeration method described in step S3 is divided into two periods: a large volume, low concentration water discharge period and a small volume, high concentration water discharge period.

[0023] For large-volume, low-concentration drainage periods, delay aeration by turning on the aeration device at the beginning of drainage and delaying aeration for 0.5 to 2 hours at the end of drainage.

[0024] For small-volume, high-concentration drainage periods, pre-aeration should be performed. The aeration device should be turned on 0.5 to 1 hour before the start of the drainage period and delayed for 0.5 to 1 hour after the end of the drainage period.

[0025] The beneficial effects of this invention are:

[0026] 1. This invention features a top-in, bottom-out plug-flow water inlet. The large length-to-diameter ratio of the tank effectively prevents short-circuiting. Water is evenly distributed through the oil-water separator's sidewall micropores at the top, then flows downwards uniformly through the suspended packing section, achieving initial and thorough adsorption of pollutants. Subsequently, after passing through the outlet pipe, it flows evenly downwards through the suspended packing, achieving a second round of thorough adsorption of pollutants. This design ensures that the pollutant concentration decreases sequentially along the water flow path from the inlet to the outlet.

[0027] 2. This invention, by setting a detachable grease trap in the primary biochemical tank, can easily remove oil sludge from the primary biochemical tank. It can make full use of the high liquid level in the biochemical tank, allowing the grease to float on the upper part of the liquid surface, ensuring the smooth flow of the grease trap's micropores at the bottom, extending the cleaning cycle of the grease trap, and effectively solving the problem of packing clumping, caking, and failure caused by grease adhesion.

[0028] 3. The suspended packing material and suspension supports of this device are all made of flexible materials, which can be bent or folded and removed as a whole from the top of the tank. After the packing material is removed, the primary biological treatment tank becomes a cavity, which can be easily cleaned with a sludge pump and a high-pressure water gun. This design can effectively solve the problem of difficult replacement and cleaning of packing material in treatment tanks with large burial depths. A large number of anaerobic microorganisms are attached to the suspended packing material section. The flocs formed by these anaerobic microorganisms have a large specific surface area, which can adsorb a large amount of pollutants at once during the water inflow period and preliminarily degrade them in the subsequent non-water inflow period. This design can significantly improve the device's ability to withstand water volume and water quality shock loads.

[0029] 4. By setting up an aeration system, the present invention can make the secondary biological treatment tank intermittently exist in aerobic, anoxic, and anaerobic states, thereby enabling a complete denitrification process, namely nitrification-denitrification, to be completed in the secondary biological treatment tank. This results in a significant reduction in the ammonia nitrogen and total nitrogen content in the effluent, ultimately leading to a significant reduction in the odor of the effluent and improving the sanitary conditions around the treatment device.

[0030] 5. The intermittent operation time of the aeration system of the present invention can be matched with the user's drainage habits. By using pre-aeration and delayed aeration methods, the problem of large influent volume and water quality impact load can be effectively solved.

[0031] 6. The device is equipped with a solar energy system. With the support of an intermittent aeration system that matches the user's drainage habits, the device can operate with minimal power consumption and can work independently without being connected to the mains power under certain circumstances. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a top view of the overall structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the method flow structure of the present invention.

[0035] The attached diagram includes the following reference numerals: 100, Primary biological treatment tank; 101, Inlet pipe; 102, Oil separator; 103, Supernatant tank; 104, Suspended packing material; 1041, Suspended floating bed; 1042, Counterweight plate; 105, First outlet pipe; 200, Secondary biological treatment tank; 201, Suspended packing material; 202, Aerated sedimentation zone; 2021, Aeration coil; 2022, Aeration pipe; 2023, Aeration pump; 203, Second outlet pipe; 300, Reclaimed water tank; 301, Reclaimed water pump; 302, Reclaimed water pipe; 303, System wiring; 304, Float level signal valve; 305, Reclaimed water system control cabinet; 306, Solar power supply system. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0037] Example 1:

[0038] like Figure 1-2 As shown, this embodiment provides a rural domestic sewage treatment and resource utilization device, including a primary biological treatment tank 100, a secondary biological treatment tank 200, and a reclaimed water tank 300. An oil separator 102 is detachably installed on the upper side of the primary biological treatment tank 100. Oil separator micropores are evenly distributed on the surface of the tank wall of the oil separator 102, with a pore size of 2-5 mm. By opening the lower part of the oil separator 102, uniform water distribution and uniform distribution of the suspended packing 104 are achieved, realizing a laminar flow state in the primary biological treatment tank 100 to achieve plug-flow effluent. The remaining space of the primary biological treatment tank 100 is a supernatant tank 103. A water inlet is provided at the top of one side of the outer wall of the primary biological treatment tank 100. Pipe 101, the inlet pipe 101 is connected to the oil separator 102, the lower part of the supernatant tank 103 is provided with suspended packing 104, the top of one side of the outer wall of the secondary biological treatment tank 200 is connected to one end of the first outlet pipe 105, the other end of the first outlet pipe 105 extends into the suspended packing 104 of the supernatant tank 103 and is close to the bottom, the middle part of the secondary biological treatment tank 200 is provided with suspended packing 201, the bottom of which is the aeration sedimentation zone 202, the top of one side of the outer wall of the reclaimed water tank 300 is connected to one end of the second outlet pipe 203, the other end of the second outlet pipe 203 extends into the interior of the secondary biological treatment tank 200 and is above the aeration sedimentation zone 202, and the reclaimed water tank 300 is provided with a water reuse device.

[0039] The suspended packing 104 includes a suspended floating bed 1041, which floats on the surface of the supernatant tank 103. The suspended packing 104 is evenly suspended at the bottom of the suspended floating bed 1041, and a counterweight plate 1042 is suspended at the bottom of the suspended packing 104.

[0040] An aeration coil 2021 is installed at the bottom of the aeration sedimentation zone 202. The inlet of the aeration coil 2021 is connected to one end of the aeration pipe 2022, and the other end of the aeration pipe 2022 is connected to the output end of the aeration pump 2023.

[0041] The water reuse device includes a reuse water pump 301, which is fixedly installed at the bottom of the reuse water tank 300. The reuse water pump 301 is equipped with a float level signal valve 304. The output end of the reuse water pump 301 is connected to one end of the reuse water pipe 302, and the other end of the reuse water pipe 302 extends out of the reuse water tank 300.

[0042] The recycled water pump 301 and the aeration pump 2023 are both electrically connected to the recycling system control cabinet 305 through the system wiring 303. The recycling system control cabinet 305, the recycled water pump 301 and the aeration pump 2023 are powered by the solar power supply system 306.

[0043] Specifically, this device consists of a primary biological treatment tank 100, a secondary biological treatment tank 200, and a reclaimed water tank 300 connected in series. The optimal ratio of the water depth to the inner cross-sectional diameter of the primary biological treatment tank 100 and the secondary biological treatment tank 200 is 1:1 to 1:3. By utilizing the large length-to-diameter ratio of the primary biological treatment tank 100 and the secondary biological treatment tank 200, the device ensures that the water has sufficient flow length to ensure the stability of the push-flow water discharge during intermittent water intake and avoids water flow short circuit.

[0044] This device features a top-inlet, bottom-outlet plug-flow water inlet, effectively preventing flow interruptions. Water is evenly distributed through the micropores on the side wall of the upper grease trap 102, taking full advantage of the high liquid level in the biological treatment tank. This allows grease to float on the surface, ensuring the unobstructed flow of the micropores at the bottom of the grease trap 102 and extending its cleaning cycle. The primary biological treatment tank 100 and secondary biological treatment tank 200 also employ a top-inlet, bottom-outlet water distribution method. Under gravity flow conditions, this avoids the influence of solids on the liquid flow pattern during solid-liquid separation, better ensuring laminar flow in the primary biological treatment tank 100. Furthermore, the wastewater flows evenly downwards through the suspended packing 104, achieving initial and thorough adsorption of pollutants. Subsequently, after passing through the first outlet pipe 105, it flows evenly downwards through the suspended packing 201, achieving a second round of thorough adsorption of pollutants. Through this design, the pollutant concentration can be reduced sequentially along the water flow from the inlet to the outlet. Thanks to the aforementioned push-flow design, the primary biological treatment tank 100 and the secondary biological treatment tank 200 are respectively equipped with suspended packing material 104 and suspended packing material 201, which can achieve two-stage adsorption of polluted water and better meet the requirements of shock load resistance. The suspended floating bed 1041, suspended packing material 104, and counterweight hanging plate 1042 of the primary biological treatment tank 100 are all made of flexible or foldable materials, and the packing section can be removed as a whole from the biological treatment tank. When a small amount of sewage enters each time, the treated water that meets the standards in the aeration sedimentation zone 202 at the bottom of the secondary biological treatment tank 200 is preferentially pushed into the reuse water tank 300, while the pollutants in the raw water are adsorbed and intercepted by the pollutants in the suspended packing material 104 and suspended packing material 201.

[0045] Furthermore, both the suspended packing material 104 and the suspended floating bed 1041 are flexible materials that can be bent or folded and removed as a whole from the top of the tank. After the packing material is removed, the primary biological treatment tank 100 becomes a cavity, which can be easily cleaned of the bottom sediment using a sludge pump and a high-pressure water gun. This design can effectively solve the problem of difficult replacement and cleaning of packing material in treatment tanks with large burial depths. A large number of anaerobic microorganisms are attached to the suspended packing material section. The bacterial flocs formed by these anaerobic microorganisms have a large specific surface area, which can adsorb a large amount of pollutants at once during the water inflow period and preliminarily degrade them in the subsequent non-water inflow period. This design can significantly improve the device's ability to withstand water volume and water quality shock loads.

[0046] The wastewater is separated into an inlet pipe 101, an oil separator 102, a supernatant tank 103, a suspended packing material 104, and a first outlet pipe 105 by a primary biological treatment tank 100. The oil separator 102 has oil-water separation micropores evenly distributed on its walls, with a pore size of 2-5 mm. After the wastewater enters the oil separator 102 through the inlet pipe 101, the effective cross-sectional area decreases and the flow velocity decreases, thereby completing the oil-water separation. At the same time, solids with a particle size larger than the small pores in the tank wall are filtered out by the oil separator 102.

[0047] Grease, scum, and large-diameter solids accumulate in the grease trap 102. The grease trap 102 can be disassembled and separated from the primary biological treatment tank 100, making it convenient to clean the grease and scum. Since the primary biological treatment tank 100 is equipped with a detachable grease trap 102, the oil sludge in the tank can be easily removed. At the same time, it can effectively solve the problem of packing clumping, caking, and failure caused by grease adhesion. This treatment process is the pretreatment process of the entire device, which can improve the treatment effect and extend the service life of the equipment.

[0048] After oil separation, the wastewater enters the supernatant tank 103. Due to the slow flow rate, the wastewater is evenly distributed in the supernatant tank 103 before entering the suspended packing material 104. The suspended packing material 104 consists of a suspended floating bed 1041, the suspended packing material 104, and a counterweight hanging plate 1042. The suspended floating bed 1041 is made of a soft material with a density less than water and has evenly distributed perforations with a diameter of 5-15 mm. The suspended floating bed 1041 can be completely removed from the primary biological treatment tank 100 via the supernatant tank 103 after being bent or folded. The primary biological treatment tank 100 is a cavity, which allows for convenient cleaning of the bottom sediment using a sludge pump and a high-pressure water gun. This design effectively solves the problem of difficult replacement and cleaning of the packing material in treatment tanks with large burial depths. In addition, a large number of anaerobic microorganisms are attached to the suspended packing material 104. The bacterial flocs formed by these anaerobic microorganisms have a large specific surface area, which can adsorb a large amount of pollutants at once during the water inflow period and preliminarily degrade them during the subsequent non-water inflow period. This design can significantly improve the device's ability to withstand water volume and water quality shock loads.

[0049] The suspended packing 104 can be composed of multiple soft packings, semi-soft packings, combined fiber packings, or elastic three-dimensional packings, and the central rope of the suspended packing 104 has a certain tensile strength.

[0050] The counterweight plate 1042 is made of a soft material with a density greater than that of water, and can be completely removed from the primary biochemical tank 100 via the supernatant tank 103 after being bent or folded.

[0051] The upper end of the suspended packing 104 is fixed to the suspended floating bed 1041, and the lower end is fixed to the counterweight hanging plate 1042. Under the action of the buoyancy of the suspended floating bed 1041 and the gravity of the counterweight hanging plate 1042, the suspended packing 104 is uniformly distributed in the suspended packing 104 in a vertically suspended state.

[0052] The suspended packing material 104 has a large specific surface area, allowing anaerobic microorganisms such as hydrolytic bacteria, acid-producing bacteria, and methanogenic bacteria in wastewater to attach to and multiply in large quantities. This process initially degrades most pollutants in the wastewater under anaerobic conditions through steps such as adsorption, hydrolysis, acidification, and denitrification. This process is the primary treatment process of the entire device, which can degrade large molecular organic pollutants in wastewater into easily treatable small molecular pollutants.

[0053] After initial degradation, the wastewater flows into the secondary biological treatment tank 200 through the first effluent pipe 105. The first effluent pipe 105 extends into the lower 1 / 3 to 1 / 4 of the suspended packing material 104 to prevent short-circuiting and ensure that the pollutants in the water can be fully adsorbed and degraded by the microorganisms attached to the suspended packing material 104 before flowing into the next tank.

[0054] The secondary biological treatment tank 200 consists of suspended packing material 201, an aerated sedimentation zone 202, and a second effluent pipe 203. The suspended packing material 201 is composed of suspended packing material with a high specific surface area and a density lower than that of water. The volume of the suspended packing material 201 is 30-70% of the effective volume of the secondary biological treatment tank 200. Due to the large specific surface area of ​​the suspended packing material 201, anaerobic microorganisms such as hydrolytic bacteria, acid-producing bacteria, and methanogenic bacteria in the wastewater can attach in large quantities to the suspended packing material 201. This allows most of the pollutants in the wastewater to be further degraded under anaerobic conditions through steps such as adsorption, hydrolysis, acidification, nitrification, and denitrification. When the microorganisms on the suspended packing material 201 age and become solids due to the passage of time, they detach from the surface of the packing material and settle in the aerated sedimentation zone 202.

[0055] An aeration coil 2021 is arranged at the bottom of the aerated sedimentation zone 202. The aeration coil 2021 is connected to the aeration pump 2023 through the aeration pipe 2022, so that a large number of micron-sized air bubbles can be introduced into the secondary biological treatment tank 200 to increase the dissolved oxygen concentration in the secondary biological treatment tank 200.

[0056] The reuse system control cabinet 305 can control the aeration pump 2023 to start intermittently, so that the microbial cycle in the secondary biological treatment tank 200 is under aerobic, anoxic, and anaerobic conditions, enabling the ammonia nitrogen in the wastewater to complete the complete process of nitrification and denitrification, thereby reducing the ammonia nitrogen content in the wastewater and fundamentally eliminating the odor in the water. This process is the deep treatment process of the entire device, which can effectively reduce pollutant indicators such as COD, ammonia nitrogen, and total nitrogen in wastewater.

[0057] The reuse system control cabinet 305 can set the time and duration of the aeration pump 2023 to be turned on intermittently each day, according to the user's water usage habits and the quality of the effluent.

[0058] The second outlet pipe 203 extends into the lower part of the suspended packing, but also maintains a certain distance from the bottom of the aerated sedimentation zone 202. The degraded water flows out from the upper part of the aerated sedimentation zone 202. The water from the second outlet pipe 203 enters the recycled water tank 300 for storage. The recycled water tank 300 consists of a recycled water pump 301, a recycled water pipe 302, a recycled water control system wiring 303, a float level signal valve 304, a recycled water system control cabinet 305, an aeration pump 2023, and a solar energy system 307.

[0059] The solar system 307 is equipped with solar panels and a solar controller. Under more optimized conditions, it can also be equipped with a battery or an inverter, or both.

[0060] The float level signal valve 304 can provide high and low level signals to the reuse system control cabinet 305 according to the liquid level of the reuse water tank 300. When the float level signal valve 304 sends a high level signal, the reuse system control cabinet 305 will sound an alarm to indicate that the liquid level is too high. When the float level signal valve 304 sends a low level signal, the reuse system control cabinet 305 will forcibly shut down the reuse water pump 301.

[0061] The reuse system control cabinet 305 can determine whether the liquid level in the reuse water tank 300 and the power generation of the solar system 307 or the battery voltage meet the working conditions of the reuse water pump 301. When the working conditions are met, the reuse water pump 301 can be set to start manually or automatically. The aeration pump 2023 is operated intermittently, and its opening time can be matched with the user's drainage habits. While achieving low power consumption operation, it can better resist water volume impact load. The reuse system can issue an over-high liquid level alarm when the float liquid level signal valve 304 issues a high liquid level signal to remind the user to use water in time; it can forcibly shut down the reuse aeration pump 2023 when the float liquid level signal valve 304 issues a low liquid level signal.

[0062] Thanks to the aforementioned push-flow design, when a small amount of sewage enters each time, the treated water that meets the standards in the aeration sedimentation zone 202 at the bottom of the secondary biological treatment tank 200 is preferentially pushed into the reclaimed water tank 300, while the pollutants in the raw water are adsorbed and intercepted by the pollutants in the suspended packing 104 and the suspended packing 201, thereby realizing the ability of this device to resist water volume and water quality shock loads.

[0063] Example 2:

[0064] A method for using a rural domestic sewage treatment and resource utilization device includes the following steps:

[0065] Step S1: Oil separation and slag removal.

[0066] The oil separator 102 separates the wastewater from oil, removes sludge, and distributes water evenly, creating conditions for the primary biological treatment tank 100 to form a laminar flow state.

[0067] Step S2: Primary treatment of wastewater.

[0068] The primary biological treatment tank 100 is an anaerobic tank, responsible for the primary treatment of sewage. It utilizes anaerobic microorganisms attached to the suspended packing material 104 to fully adsorb and degrade large organic molecules, causing them to hydrolyze, acidify, and undergo anaerobic ammonification, thus initially removing COD from the water.

[0069] Step S3: Advanced treatment of wastewater.

[0070] After preliminary treatment in the primary biological treatment tank 100 (anaerobic tank), the wastewater enters the secondary biological treatment tank 200. The secondary biological treatment tank 200 is an anoxic and aerobic tank, responsible for the advanced treatment of wastewater. While further reducing COD, it also reduces the concentration of ammonia nitrogen in the water, thereby reducing the odor of the effluent. Through intermittent aeration, the microorganisms attached to the suspended packing material 201 are intermittently in an aerobic and anoxic cycle, thereby realizing the simultaneous nitrification and denitrification process.

[0071] Step S4: Water recycling.

[0072] After deep treatment, the sewage flows into the reuse tank for collection. The reuse device makes it more convenient for farmers to use water. The liquid level float valve installed in the reuse tank 300 can help realize the high water level alarm reminder to use water and the low water level to stop the pump.

[0073] Meanwhile, by controlling the aeration time through intermittent aeration according to the user's drainage habits, the aeration system consumes the least amount of electricity, which is also conducive to achieving the standard concentration of pollutants in the effluent.

[0074] The intermittent aeration method in step S3 is divided into two periods: a large volume of water with low concentration during water discharge and a small volume of water with high concentration during water discharge.

[0075] For large-volume, low-concentration drainage periods, delay aeration by turning on the aeration device at the beginning of drainage and delaying aeration for 0.5 to 2 hours at the end of drainage.

[0076] For small-volume, high-concentration drainage periods, pre-aeration should be performed. The aeration device should be turned on 0.5 to 1 hour before the start of the drainage period and delayed for 0.5 to 1 hour after the end of the drainage period.

[0077] Specifically, the reuse system control cabinet 305 can flexibly set the intermittent start time and duration of the aeration pump 2023 according to the user's water usage habits and the effluent water quality, in order to cope with the large fluctuations in the volume and quality of rural domestic sewage. For example, rural domestic sewage discharge is usually divided into three periods: morning, noon and evening. Then, the reuse system control cabinet 305 can be set to have 3 operating cycles, with the start time nodes of each operating cycle being T1, T2 and T3 respectively. The aeration duration of the aeration pump 2023 in each cycle is set to H1, H2 and H3 respectively according to the effluent water quality. The operating cycle ends when the aeration ends.

[0078] At the end of each operating cycle, the concentrations of pollutants such as COD and ammonia nitrogen in the primary biological treatment tank 100 and the secondary biological treatment tank 200 are at their lowest. At the beginning of the next operating cycle, the aeration pump 2023 is in a stopped state. Due to the consumption of dissolved oxygen by microorganisms in the water, the secondary biological treatment tank 200 will gradually enter a hypoxic or even anaerobic state, thereby completing the denitrification process. When the instantaneous flow rate of the influent is large and the average concentration of pollutants in the influent is high, the resistance to shock load can be achieved by extending the single aeration time H1, H2, and H3, thereby ensuring the stability of the effluent treatment effect.

[0079] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for using a rural domestic sewage treatment and resource utilization device, the rural domestic sewage treatment and resource utilization device comprising a first biochemical tank, a second biochemical tank and a reuse water tank, an oil separation tank being detachably arranged on one side of the upper portion of the first biochemical tank, oil separation micropores being uniformly arranged on the surface of the tank wall of the oil separation tank, the remaining space of the first biochemical tank being a supernatant tank, a water inlet pipe being arranged at the top of one side of the outer wall of the first biochemical tank, the water inlet pipe being in communication with the oil separation tank, a suspended filler assembly being arranged in the lower portion of the supernatant tank, the suspended filler assembly comprising a suspended floating bed, the suspended floating bed floating on the liquid surface of the supernatant tank, suspended fillers being uniformly suspended on the bottom of the suspended floating bed, a counterweight hanging plate being suspended on the bottom of the suspended fillers, the top of one side of the outer wall of the second biochemical tank being in communication with one end of a first water outlet pipe, the other end of the first water outlet pipe extending into the supernatant tank near the bottom, a suspended filler being arranged in the middle of the second biochemical tank, the bottom being an aeration sedimentation zone, the top of one side of the outer wall of the reuse water tank being in communication with one end of a second water outlet pipe, the other end of the second water outlet pipe extending into the second biochemical tank and being above the aeration sedimentation zone, a water reuse device being arranged in the reuse water tank, and the method being characterized by the following steps: The use method comprises the following steps: Step S1, oil separation and residue removal: The oil separation tank is used to separate oil, remove residue and uniformly distribute water, so as to create conditions for forming a laminar flow state in the primary biochemical tank; Step S2, primary treatment of sewage: The primary biochemical tank is an anaerobic tank, which is responsible for the primary treatment of sewage, uses anaerobic microorganisms attached to the suspended filler to fully adsorb and degrade macromolecular organic matter, so as to hydrolyze, acidify and anaerobically ammonify the macromolecular organic matter, and preliminarily remove COD in the water; Step S3, advanced treatment of sewage: The sewage treated preliminarily in the primary biochemical tank enters the secondary biochemical tank, which is an anoxic and aerobic tank, and is responsible for the advanced treatment of sewage, further reduces COD, reduces the ammonia nitrogen concentration in the water, thereby reduces the odor of the effluent, and through the intermittent aeration method, the microorganisms attached to the suspended filler are intermittently in the cyclic state of aerobic and anoxic, so as to realize the same process nitrification and denitrification process; The intermittent aeration method opens the aeration according to the user's drainage habit, for the large water volume and low concentration drainage period: the aeration device is controlled to be opened at the beginning of the drainage period, and delayed aeration for 0.5-2h at the end of the drainage period; for the small water volume and high concentration drainage period: the aeration device is controlled to be opened 0.5-1h before the beginning of the drainage period, and delayed aeration for 0.5-1h at the end of the drainage period; Step S4, water recycling: After the advanced treatment of sewage, the sewage flows into the recycled water tank for collection, through the water recycling device, the water use of farmers is more convenient, and through the liquid level float ball valve arranged in the recycled water tank, high water level alarm reminding water use and low water level pump stop are realized.

2. The method of use of claim 1, wherein: The pore size of the oil separation micro-pores of the oil separation tank is 2-5mm.

3. The method of use of claim 2, wherein: The ratio of the cross-sectional diameter size to the water depth size in the primary biochemical tank and the secondary biochemical tank is 1:1-1:

3.

4. The method of use of claim 3, wherein: The bottom of the aeration sedimentation zone is provided with an aeration coil pipe, the input port of the aeration coil pipe is in communication with one end of an aeration pipe, and the other end of the aeration pipe is in communication with the output end of an aeration pump.

5. The method of use of claim 4, wherein: The water recycling device comprises a recycled water pump, the recycled water pump is fixedly installed on the inner bottom of the recycled water tank, the recycled water pump is provided with a float ball liquid level signal valve, the output end of the recycled water pump is in communication with one end of a recycled water pipe, and the other end of the recycled water pipe extends out of the recycled water tank.

6. The method of use of claim 5, wherein: The recycled water pump and the aeration pump are electrically connected with a recycled system control cabinet through system wiring, and the recycled system control cabinet, the recycled water pump and the aeration pump are powered by a solar power supply system.

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