A fully automatic aquaculture ecological purification system and its operation control method

Abstract

The present invention discloses a fully automatic aquatic aquaculture ecological purification system and an operation control method. The system includes a breeding pool, a sewage pool and a pipeline for connecting the breeding pool and the sewage pool. The sewage pool is connected to a sewage main pipeline. The fully automatic aquatic aquaculture ecological purification system also includes a purification pool. The purification pool is connected to the sewage pool and an automatic micro-filtration device is provided on the communication channel between the two. A graded filtration group is connected between the purification pool and the breeding pool. The breeding pool and the graded filtration group are connected through a reflux pipeline. A backwash sewage pipeline is connected between the graded filtration group and the sewage main pipeline. The present invention filters and purifies the water in the breeding pool through multiple purification methods and returns it to the breeding pool, thereby increasing the fresh-keeping time of the water under the premise of controlling the introduction of external water. The present invention can reversely flush the filtering device in the system to discharge the dirt intercepted by the filter in time, which not only improves the water purification efficiency, but also greatly reduces manual cleaning, saving time and labor.

Description

Technical Field

[0001] The present invention relates to an aquaculture purification system and an operation control method thereof, and more specifically, to a fully automatic aquaculture ecological purification system and an operation control method thereof. Background Art

[0002] With the improvement of people's living standards and living conditions, more and more people are raising aquariums indoors in their residences or workplaces, which can not only beautify the indoor environment, but also cultivate their temperament. Raising aquariums indoors is much more difficult than raising aquariums in the natural environment of ponds and lakes, because in the natural environment, there is ample space and good openness, which makes it easy to form a relatively complete ecosystem. In the indoor environment, the volume of the aquarium breeding device is limited and relatively closed, making it difficult to establish a complete ecological chain to achieve the material exchange of life activities, so it relies more on artificial intervention. At present, the commonly used indoor aquarium breeding devices usually use micro-pumps to blow air into the water body of the aquarium breeding device to achieve the regulation of the living environment of aquariums. Although this can achieve the renewal of the water body and the supplement of oxygen in the aquarium breeding device in the short term, the excrement of aquariums cannot be decomposed. After a period of accumulation, it will still seriously pollute the water quality of the aquarium breeding device and damage the internal environment. Because most of the existing aquarium breeding devices do not have the function of automatically renewing the environment and maintaining the water quality for a long time, when raising aquariums indoors, the excrement of aquariums has to be cleaned regularly, which increases the inconvenience of indoor aquarium breeding. Therefore, the existing aquarium breeding devices still need to be improved. The invention with publication number CN108770771A disclosed a fish tank purification system and fish tank on November 9, 2018, including a first filter chamber and a second filter chamber, the first filter chamber is filled with a first filter medium, the second filter chamber is filled with a second filter medium, the first filter medium and the second filter medium are provided with a cultivation base, a water pump is provided outside the first filter chamber, the water pump is used to transport the water in aquaculture to the top of the first filter medium, a first channel is provided below the cavity wall of the first filter chamber, the first channel is connected to the bottom of the cavity wall of the second filter chamber, a second channel is provided above the cavity wall of the second filter chamber, and the second channel is used to transport the filtered water to the fish tank. The invention achieves efficient removal of pollutants in water and purification of water in the fish tank through the synergistic effect of filter media, plants and microorganisms, without the need to frequently change water in the fish tank, reducing labor costs, improving water quality, and improving the growth environment of fish. However, the invention has a complex structure, requires many types of materials, and is not easy to establish and maintain its micro-ecosystem. Summary of the invention

[0003] Most of the existing aquarium breeding devices do not have the function of automatically updating the environment and maintaining water quality for a long time, which increases the inconvenience of indoor aquarium breeding. To overcome this defect, the present invention provides a fully automatic aquarium breeding ecological purification system that can efficiently clean aquarium excrement, maintain water quality for a long time, and facilitate indoor aquarium breeding.

[0004] The technical solution of the present invention is: a fully automatic aquarium breeding pond ecological purification system and control method, comprising a breeding pond, a sewage discharge pond and a pipeline for connecting the breeding pond and the sewage discharge pond, the sewage discharge pond is connected to a sewage discharge main pipeline, the fully automatic aquarium breeding pond ecological purification system also includes a purification pool, the purification pool is connected to the sewage discharge pond and an automatic micro-filtration device is arranged on the communication channel between the two, a graded filtration group is connected between the purification pool and the breeding pond, the purification pool and the graded filtration group are connected through a main circulation pipeline, the breeding pond and the graded filtration group are connected through a reflux pipeline, and a backwash sewage discharge pipeline is connected between the graded filtration group and the sewage discharge main pipeline. When this fully automatic aquarium aquaculture ecological purification system is working, the water in the aquaculture pool is first discharged into the sewage pool, and then filtered by the automatic microfiltration device. The larger particles and impurities are blocked and trapped in the sewage pool. The water after preliminary filtration enters the graded filtration group for fine filtration, and finally returns to the aquaculture pool through the reflux pipe. After multiple treatments, the content of harmful substances in the water can be controlled at a low level. This part of the water is then treated by adding air through a conventional air pump to increase the oxygen content in the water, and then a microcirculation of an aquaculture system is completed, ensuring a beneficial environment for the survival of aquatic animals. The particles and impurities trapped in the sewage pool can be directly discharged through the sewage main pipe. After the system has been running for a certain period of time, the switch and the water pump can be used to automatically start the backwashing program, and the cleaner water in the purification pool can be used for backwashing, and the insoluble matter trapped in the graded filtration group and the pipeline can be backwashed to the backwash sewage pipeline, and then discharged from the sewage main pipeline. In this way, the graded filtration group and related pipelines can be regenerated by themselves to prevent the graded filtration group from failing due to long-term deposition of dirt.

[0005] Preferably, the automatic microfiltration device includes a support plate, a filter, a filter support plate and a motor. The support plate is fixed between the purification tank and the sewage tank and is provided with a connecting port. The filter is fixed on the filter support plate. The filter support plate is a hollow structure. The filter support plate is rotatably connected to the connecting port of the support plate and connected to the output end of the motor. The motor drives the filter support plate to rotate, so that the filter always filters the water in a dynamic state, which helps to slow down the adhesion of particles and impurities on the filter and keep the filter effective for a long time. The filter cleaning device can also be set at a fixed point to form a relative motion with the dynamic filter, so as to remove the attached dirt on the filter in time.

[0006] Preferably, the motor is fixed on the support plate, and the output end of the motor is connected to the filter support plate through a belt transmission mechanism. Through the belt transmission mechanism, the motor can drive the filter support plate at a long distance, so that the motor can be set at a position far away from the water, reducing the probability of getting wet and avoiding short circuit.

[0007] Preferably, a flushing nozzle is provided in the purification tank to spray water to the filter screen. The flushing nozzle sprays water from one side of the purification tank to the sewage tank, which can pass through the filter screen to flush away the dirt attached to the filter screen toward the sewage tank side, so as to keep the filter screen unobstructed so as to work normally for a long time.

[0008] Preferably, a sealing strip is provided between the filter support plate and the support plate, so as to prevent the purification tank and the sewage tank from communicating through the gap between the filter support plate and the support plate, and to prevent the water in the sewage tank from directly entering the purification tank without being filtered by the automatic micro-filtration device, thereby polluting the water in the purification tank.

[0009] Preferably, a sterilization device is provided in the purification pool. Aquatic excrement is rich in organic matter and is prone to breeding bacteria and other microorganisms. The automatic microfiltration device can block solid phase substances, but it is difficult to intercept microorganisms. The sterilization device is used to sterilize and inactivate the water in the system through ultraviolet rays and ozone, or to add drugs to improve the overall water quality.

[0010] As a preferred embodiment, the return pipe is provided with an automatic thermostat, a disinfection device and an air-water mixing device. The automatic thermostat is used to adjust the temperature of the water entering the return pipe so that the temperature of the water finally returning to the breeding pool meets the requirements of aquarium breeding; the disinfection device is used to perform the final disinfection treatment on the water that is about to return to the breeding pool to ensure that the water entering the breeding pool is clean and hygienic; the air-water mixing device is used to increase the oxygen content in the water, which is suitable for aquarium life.

[0011] Preferably, a graded filter group backwash pipe is connected between the purification tank and the return pipe, and electric valves are provided in the graded filter group backwash pipe and the return pipe. The electric valves in the graded filter group backwash pipe and the return pipe can respectively control the opening and closing of the graded filter group backwash pipe and the return pipe according to the work instructions. When the graded filter group backwash pipe is closed and the return pipe is connected, the fully automatic aquarium breeding ecological purification system performs a positive circulation operation, that is, the water in the breeding pool is returned to the breeding pool through the return pipe after multiple treatments in the sewage tank, the purification tank, and the graded filter group; when the graded filter group backwash pipe is connected and the return pipe is closed, the fully automatic aquarium breeding ecological purification system performs a backwash operation, and the cleaner water in the purification tank enters the graded filter group backwash pipe, and reverses in the graded filter group backwash pipe, reversely flushes the graded filter group, and finally backwashes the insoluble matter trapped in the graded filter group and the pipe during the positive circulation to the backwash sewage pipe, and then discharges it from the sewage main pipe.

[0012] Preferably, monitoring sensors are provided in the purification tank and the sewage tank. The monitoring sensors may be water level sensors, temperature sensors, oxygen content sensors, pressure sensors, water quality sensors, etc., which are used to monitor the operating status and operating effect of the system and serve as trigger signals for starting related pumps, valves, and motors in the system, so that the system can respond quickly and save energy, and finally make the water environment most suitable for aquatic survival.

[0013] The operation control method of the fully automatic aquaculture ecological purification system comprises the following steps:

[0014] 1) The equipment is powered on, the system self-checks, and the operating data of the circulating water pump is initialized;

[0015] 2) Run the circulating water pump, connect the main circulation pipe and the return pipe, and disconnect the sewage main pipe and the backwash sewage pipe;

[0016] 3) Determine whether the monitoring sensor in the sewage tank is continuously closed for m seconds, if so, jump to step 4);

[0017] 4) Disconnect the circulating water pump, delay, start the sewage pump for y seconds, continue to run the circulating water pump, and jump to step 6);

[0018] 5) Determine whether the monitoring sensor in the purification pool is continuously closed for e seconds, if so, run the water pump and jump to step 6); or determine whether the monitoring sensor in the purification pool is continuously disconnected for f seconds, if so, disconnect the water pump and jump to step 6);

[0019] 6) Check whether the water pump has been running for T1 hours cumulatively, if so, jump to step 7);

[0020] 7) Disconnect the main circulation pipeline and the return pipeline, connect the sewage main pipeline and the backwash sewage pipeline, and delay T2 seconds;

[0021] 8) Connect the main circulation pipeline and the return pipeline, and disconnect the main sewage pipeline and the backwash sewage pipeline;

[0022] 9) Run the sewage discharge for T3 seconds, start the oxygen supply for T4 minutes, and jump to step 2).

[0023] The beneficial effects of the present invention are

[0024] The water quality of aquaculture is maintained for a long time through water circulation. The present invention filters and purifies the water in the aquaculture pool through multiple purifications and then returns it to the pool, thereby increasing the water preservation time under the premise of controlling the introduction of external water.

[0025] The invention has a high degree of automation and is convenient for indoor aquarium breeding. The invention can reversely flush the filter device in the system to discharge the dirt intercepted by the filter in time, which not only improves the water purification efficiency, but also greatly reduces manual cleaning, saves time and labor, and makes indoor aquarium breeding more convenient.

[0026] The system is easy to build. The configuration of the present invention is relatively simple and contains more industrial components. Compared with the practice of cultivating and establishing a complete ecosystem in an aquaculture device, the present invention introduces more artificial intervention methods, which facilitates the rapid construction of the system and immediate effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A structural schematic diagram of the present invention;

[0028] Figure 2 A schematic diagram of the structure of the automatic microfiltration device of the present invention;

[0029] Figure 3 A side view of the automatic microfiltration device of the present invention;

[0030] Figure 4 A schematic diagram of the structure of the filter support plate in the present invention;

[0031] Figure 5 The present invention is a system operation flow chart.

[0032] In the figure, 1-breeding pond, 2-purification pond, 3-drainage pond, 41-first electric valve, 42-second electric valve, 43-third electric valve, 44-fourth electric valve, 5-drainage main pipeline, 51-drainage pump, 52-recoil drainage pipeline, 6-circulating water pump, 7-intermediate filtration device, 8-PH regulating device, 9-nitrification device, 10-denitrification device, 11-sterilization device, 110-reflux pipeline, 12-disinfection device, 13-gas-water mixing device Combination device, 14-oxygen source, 15-monitoring sensor, 16-automatic microfiltration device, 161-support plate, 162-filter, 163-filter support plate, 164-motor, 165-flushing nozzle, 166-driving pulley, 167-driven pulley, 168-synchronous belt, 17-water supply pipe, 171-water full automatic shut-off device, 18-water outlet pipe, 19-automatic constant temperature device, 20-main circulation pipeline, 21-grading filter group backwash pipeline. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments of the accompanying drawings.

[0034] Embodiment 1:

[0035] like Figures 1 to 5As shown, a fully automatic aquarium aquaculture ecological purification system includes a breeding pool 1, a sewage pool 3, and a water outlet pipe 18 for connecting the breeding pool 1 and the sewage pool 3. The sewage pool 3 is connected to a sewage main pipeline 5, and a sewage pump 51 is installed at the beginning of the sewage main pipeline 5. It also includes a purification pool 2, and a water supply pipe 17 is connected to the purification pool 2. The water supply pipe 17 is provided with a water full automatic closing device 171 at the connecting part on the inner wall of the purification pool 2. The purification pool 2 is connected to the sewage pool 3, and an automatic micro-filtration device 16 is provided on the connecting channel between the two. A graded filtration group is provided between the purification pool 2 and the breeding pool 1. The purification pool 2 is connected to the graded filtration group through a main circulation pipeline 20, and a circulating water pump 6 is provided at the beginning of the main circulation pipeline 20. The breeding pool 1 is connected to the graded filtration group through a reflux pipeline 110, and a backwash sewage pipeline 52 is connected between the graded filtration group and the sewage main pipeline 5. The two ends of the backwash sewage pipeline 52 are respectively connected to the sewage main pipeline 5 and the main circulation pipeline 20. The purification tank 2 and the sewage tank 3 are both provided with a water level sensor 15. The automatic microfiltration device 16 comprises a support plate 161, a filter screen 162, a filter screen support plate 163 and a motor 164. The support plate 161 and the filter screen support plate 163 are both made of organic glass. The support plate 161 is fixed between the purification tank 2 and the sewage tank 3 and is provided with a connecting port. The filter screen 162 is fixed on the filter screen support plate 163. The filter screen support plate 163 is a hollow structure. The main body of the filter screen support plate 163 is annular and has cross-shaped spokes. The cross-shaped spokes divide the inner circle area of ​​the filter screen support plate 163 into four fan-shaped windows. The filter screen support plate 163 covers the connecting port of the support plate 161. A sealing strip is provided between the filter screen support plate 163 and the support plate 161. The motor 164 is fixed on the support plate 161, and the output end of the motor 164 is connected to the filter screen support plate 163 through a belt transmission mechanism. The belt transmission mechanism includes a driving pulley 166, a driven pulley 167 and a synchronous belt 168. The output shaft of the motor 164 passes through the support plate 161 and is connected to the driving pulley 166 through a coupling. The driven pulley 167 is fixedly connected to the center of the filter support plate 163, that is, the intersection center of the cross-shaped spokes, through a connecting shaft, so that when the motor 164 is running, the filter support plate 163 can rotate with the driven pulley 167 and form a rotational connection with the connecting port of the support plate 161. A flushing nozzle 165 that can spray water to the filter 162 is provided in the purification tank 2. The flushing nozzle 165 points to the sewage tank 3 across the filter 162. The flushing nozzle 165 is fixed to the support plate 161 through a nozzle bracket, and the flushing nozzle 165 draws water from the purification tank 2. A sterilization device 11 is provided in the purification tank 2. The return pipe 110 is provided with an automatic constant temperature device 19 , a disinfection device 12 and an air-water mixing device 13 . The disinfection device 12 is an ultraviolet lamp. The air-water mixing device 13 is connected to an oxygen source 14 .A graded filter group backwash pipe 21 is connected between the purification pool 2 and the return pipe 110. Electric valves are provided in the main circulation pipe 20, the graded filter group backwash pipe 21, the return pipe 110 and the backwash sewage pipe 52. The electric valves include a first electric valve 41 in the backwash sewage pipe 52, a second electric valve 42 in the main circulation pipe 20, a third electric valve 43 in the graded filter group backwash pipe 21 and a fourth electric valve 44 in the return pipe 110. The second electric valve 42 is located upstream of the intersection of the backwash sewage pipe 52 and the main circulation pipe 20, and the fourth electric valve 44 is located downstream of the intersection of the graded filter group backwash pipe 21 and the return pipe 110. The motor 164 and each electric valve 4 are connected to a controller. The graded filter group includes an intermediate filter device 7, a pH adjustment device 8, a nitrification device 9 and a denitrification device 10 of the beneficial biological legion, and the intermediate filter device 7, the pH adjustment device 8, the nitrification device 9 and the denitrification device 10 are connected in series in sequence. The decomposition of aquatic excrement is mainly carried out through the action of nitrifying bacteria and denitrifying bacteria. Substances beneficial to aquatic animals will dissolve in the water and continue to circulate, while insoluble substances will be retained in the corresponding purification and filtration devices and then pass through the pH adjustment device to adjust the pH value of the water. The pH buffer solution can be used to control the pH value of the water at around 7.3, which is suitable for aquatic life.

[0036] When the fully automatic aquaculture ecological purification system is working, there are two working states: positive circulation and backwashing. Each electric valve 4 performs opening and closing actions according to the working instructions issued by the controller, so that the backwash pipe 21 and the backwash drainage pipe 52 of the graded filtration group are closed and the main circulation pipe 20 and the return pipe 110 are connected. The fully automatic aquaculture ecological purification system performs a positive circulation operation, and the water in the breeding pool 1 is discharged into the drainage pool 3. The motor 164 drives the filter support plate 163 to rotate, so that the filter 162 always filters the water in a dynamic state, which helps to slow down the adhesion of particles and impurities on the filter, so that the filter can maintain its effectiveness for a long time. After preliminary filtration by the automatic microfiltration device 16, larger particles and impurities are blocked and retained in the sewage tank 3. The water after preliminary filtration enters the graded filtration group for fine filtration, and finally returns to the breeding pond 1 through the reflux pipe 110. The content of harmful substances in the water body after multiple treatments can be controlled at a low level. This part of the water body is then treated by adding air through the air-water mixing device 13 to increase the oxygen content in the water body, thus completing the microcirculation of an aquaculture system and ensuring a beneficial environment for the survival of aquatic animals. After the system has been running for a certain period of time, under the control of the controller, the backwashing procedure is automatically started by using the cooperation of the electric valve 4 and various pumps. At this time, the backwashing pipe 21 of the graded filter group and the backwashing sewage pipe 52 are connected, while the main circulation pipe 20 and the return pipe 110 are closed. The relatively clean water in the purification tank 2 enters the backwashing pipe 21 of the graded filter group, and flows backward in the backwashing pipe 21 of the graded filter group, backwashing the graded filter group, and finally backwashes the insoluble matter trapped in the graded filter group and related pipes during the positive circulation to the backwashing sewage pipe 52, and then discharged from the sewage main pipe 5. At the same time, the flushing nozzle 165 sprays water from one side of the purification tank 2 to the sewage tank 3, which can pass through the filter screen 162 to wash away the attached dirt on the filter screen toward the sewage tank side, and keep the filter screen 162 unobstructed so as to work normally for a long time. The particles and impurities trapped in the sewage tank 3 can be directly discharged through the sewage main pipe 5.

[0037] The system executes the control program through the controller, and its operation control steps are as follows:

[0038] 1) The equipment is powered on, the system self-checks, and the operating data of the circulating water pump is initialized;

[0039] 2) The circulating water pump is operated, the second electric valve 42 and the fourth electric valve 44 are connected, so that the main circulation pipeline 20 and the return pipeline 110 are connected, and the first electric valve 41 and the third electric valve 43 are disconnected, so that the sewage main pipeline 5 and the backwash sewage pipeline 52 are disconnected;

[0040] 3) Determine whether the monitoring sensor 15 in the sewage tank 3 is continuously closed for m seconds, if so, jump to step 4);

[0041] 4) Disconnect the circulating water pump, delay, start the sewage pump for y seconds, continue to run the circulating water pump, and jump to step 6);

[0042] 5) Determine whether the monitoring sensor in the purification pool 2 is continuously closed for e seconds, if so, run the water pump and jump to step 6); or determine whether the monitoring sensor 15 in the purification pool 2 is continuously disconnected for f seconds, if so, disconnect the water pump and jump to step 6);

[0043] 6) Check whether the water pump has been running for T1 hours cumulatively, if so, jump to step 7);

[0044] 7) The second electric valve 42 and the fourth electric valve 44 are disconnected, so that the main circulation pipeline 20 and the return pipeline 110 are disconnected, and the first electric valve 41 and the third electric valve 43 are connected, so that the sewage main pipeline 5 and the backwash sewage pipeline 52 are connected, and the delay is T2 seconds;

[0045] 8) The second electric valve 42 and the fourth electric valve 44 are connected, so that the main circulation pipeline 20 and the return pipeline 110 are connected, and the first electric valve 41 and the third electric valve 43 are disconnected, so that the sewage main pipeline 5 and the backwash sewage pipeline 52 are disconnected;

[0046] 9) Run the sewage discharge for T3 seconds, start the oxygen supply for T4 minutes, and jump to step 2).

[0047] In this embodiment, m is 7 seconds, e is 7 seconds, f is 7 seconds, y is 7 seconds, T1 is 7 hours, T2 is 40 seconds, T3 is 20 seconds, and T4 is 20 minutes.

[0048] Embodiment 2:

[0049] m is 2 seconds, e is 2 seconds, f is 2 seconds, y is 2 seconds, T1 is 1 hour, T2 is 20 seconds, T3 is 10 seconds, and T4 is 10 minutes. The rest is the same as in Example 1.

[0050] Embodiment 3:

[0051] m is 12 seconds, e is 12 seconds, f is 12 seconds, y is 12 seconds, T1 is 10 hours, T2 is 60 seconds, T3 is 30 seconds, and T4 is 30 minutes. The rest is the same as in Example 1.

Claims

1. A fully automatic aquarium breeding ecological purification system, comprising a breeding pool, a sewage pool and a pipeline for connecting the breeding pool and the sewage pool, wherein the sewage pool is connected to a sewage main pipeline, and is characterized by: It also includes a purification pool, which is connected to a sewage pool and an automatic micro-filtration device is provided on the connecting channel between the two. A graded filtration group is provided between the purification pool and the breeding pool. The purification pool and the graded filtration group are connected through a main circulation pipeline, the breeding pool and the graded filtration group are connected through a reflux pipeline, and a backwash sewage pipeline is connected between the graded filtration group and the sewage main pipeline. The automatic micro-filtration device includes a support plate, a motor and a filter support plate with a hollow structure and a filter fixed thereon. The support plate is fixed between the purification pool and the sewage pool and is provided with a connecting port. The filter support plate is rotatably connected in the connecting port and is connected to the output end of the motor. A flushing nozzle that can spray water onto the filter is provided in the purification pool.

2. The fully automatic aquaculture ecological purification system according to claim 1 is characterized by: The motor is fixed on the support plate, and the output end of the motor is connected with the filter support plate through a belt transmission mechanism.

3. The fully automatic aquaculture ecological purification system according to claim 1 is characterized by: A sealing strip is provided between the filter support disc and the support plate.

4. The fully automatic aquaculture ecological purification system according to claim 1 is characterized by: There is a sterilization device in the purification tank.

5. The fully automatic aquaculture ecological purification system according to claim 1 is characterized by: The return pipe is equipped with an automatic constant temperature device, a disinfection device and a gas-water mixing device.

6. The fully automatic aquaculture ecological purification system according to claim 5 is characterized by: A graded filter group backwash pipe is connected between the purification tank and the return pipe, and electric valves are arranged in the graded filter group backwash pipe and the return pipe.

7. The fully automatic aquaculture ecological purification system according to any one of claims 1 to 6, characterized in that Monitoring sensors are installed in both the purification tank and the sewage tank.

8. The operation control method of the fully automatic aquaculture ecological purification system according to any one of claims 1 to 7, characterized in that The following steps are included : 1) The equipment is powered on, the system self-checks, and the operating data of the circulating water pump is initialized; 2) Run the circulating water pump, connect the main circulation pipe and the return pipe, and disconnect the sewage main pipe and the backwash sewage pipe; 3) Determine whether the monitoring sensor in the sewage tank is continuously closed for m seconds, if so, jump to step 4); 4) Disconnect the circulating water pump, delay, start the sewage pump for y seconds, continue to run the circulating water pump, and jump to step 6); 5) Determine whether the monitoring sensor in the purification pool is continuously closed for e seconds, if so, run the water pump and jump to step 6); or determine whether the monitoring sensor in the purification pool is continuously disconnected for f seconds, if so, disconnect the water pump and jump to step 6); 6) Check whether the water pump has been running for T1 hours cumulatively, if so, jump to step 7); 7) Disconnect the main circulation pipeline and the return pipeline, connect the sewage main pipeline and the backwash sewage pipeline, and delay T2 seconds; 8) Connect the main circulation pipeline and the return pipeline, and disconnect the main sewage pipeline and the backwash sewage pipeline; 9) Run the sewage discharge for T3 seconds, start the oxygen supply for T4 minutes, and jump to step 2).

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