A low-power rural sewage treatment system based on wind-solar complementary power generation

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to a low-power rural sewage treatment system based on wind-solar complementary power generation, comprising a multifunctional anoxic tank, a fixed-bed biofilm anoxic tank, a fixed-bed biofilm aerobic sedimentation tank and a fan connected in sequence; the fan is connected to the fixed-bed biofilm anoxic tank and the fixed-bed biofilm aerobic sedimentation tank through pipelines, and a two-position five-way solenoid valve is provided on the pipeline, and the two-position five-way solenoid valve is used to connect the fixed-bed biofilm anoxic tank with the fan or connect the fixed-bed biofilm anoxic tank with the atmosphere or connect the fan with an aeration device. The present invention sets two stirring modes of "natural water inlet stirring" and "pulse pressure circulation stirring" in the fixed-bed biofilm anoxic tank, which improves the stirring efficiency while reducing energy consumption; at the same time, the fixed-bed biofilm aerobic sedimentation tank adopts air pressure gas water inlet, which greatly reduces energy consumption compared with traditional water pump air lift, reduces dissolved oxygen introduction, and improves carbon source utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a low-power rural sewage treatment system based on wind-solar complementary power generation. Background Art

[0002] With the rapid development of my country's rural economy, the living standards of farmers have greatly improved, but the rural environmental construction is not in sync with economic development, among which the water pollution problem is particularly serious. The random discharge of untreated domestic sewage causes the water in ditches and ponds to become black and smelly, and mosquitoes breed, affecting the rural living environment and threatening the health of residents. At the same time, it will cause drinking water pollution and eutrophication of lakes and reservoirs.

[0003] The existing sewage treatment system has the following shortcomings: high energy consumption, many equipment, poor system operation stability, difficult to control sludge discharge, low carbon source utilization and high carbon emissions. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a low-power rural sewage treatment system based on wind-solar complementary power generation. Two stirring modes, namely "natural water inlet stirring" and "pulse pressure circulation stirring", are set in the fixed-bed biofilm anoxic tank. Slow stirring and high-intensity stirring are combined to improve the stirring efficiency while reducing energy consumption. At the same time, the fixed-bed biofilm aerobic sedimentation tank adopts air pressure gas water inlet, which greatly reduces energy consumption compared with traditional water pump air lift, reduces the introduction of dissolved oxygen, and improves the utilization rate of carbon source.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A low-power rural sewage treatment system based on wind-solar complementary power generation, comprising a multifunctional anoxic tank, a fixed-bed biofilm anoxic tank, a fixed-bed biofilm aerobic sedimentation tank and a fan connected in sequence;

[0007] The liquid level in the fixed-bed biofilm aerobic sedimentation tank is higher than the liquid level in the multifunctional anoxic tank, and the fixed-bed biofilm aerobic sedimentation tank is connected to the water inlet of the multifunctional anoxic tank through a reflux pipe;

[0008] The multifunctional aerobic tank is used to precipitate particulate organic matter in the sewage to the bottom of the multifunctional aerobic tank through at least one precipitation;

[0009] The multifunctional anoxic tank is provided with a regulating area for temporarily storing sewage after sedimentation treatment, and the regulating area is connected with the fixed bed biofilm anoxic tank through a connecting pipe. The sewage entering the fixed bed biofilm anoxic tank through the regulating area makes a circular motion in the fixed bed biofilm anoxic tank, thereby naturally inflowing and stirring the sewage in the fixed bed biofilm anoxic tank;

[0010] The fixed bed biofilm anoxic tank is sealed;

[0011] An aeration device is provided at the bottom of the fixed bed biofilm aerobic sedimentation tank;

[0012] The fan is connected to the fixed bed biofilm anoxic tank and the fixed bed biofilm aerobic sedimentation tank respectively through pipelines, and a two-position five-way solenoid valve is provided on the pipeline. The two-position five-way solenoid valve is used to connect the fixed bed biofilm anoxic tank with the fan or to connect the fixed bed biofilm anoxic tank with the atmosphere or to connect the fan with the aeration device; the fan is used to supply air to the aeration device or to supply air to the fixed bed biofilm anoxic tank to compress the sewage in the fixed bed biofilm anoxic tank into the regulation area or the fixed bed biofilm aerobic sedimentation tank.

[0013] Furthermore, the fixed bed biofilm anoxic tank comprises a closed container, the closed container comprises an upper cylindrical cavity and a lower conical cavity, and the connecting pipe is arranged along the tangent direction of the cylindrical cavity in the water outlet direction in the closed container.

[0014] Furthermore, the connecting pipe is a U-shaped pipe.

[0015] Furthermore, one end of the connecting pipe connected to the closed container is located below the highest operating liquid level in the closed container.

[0016] Furthermore, a basket grille is provided at the water inlet of the regulating zone.

[0017] Furthermore, the multifunctional oxygen-containing pool is provided with three sedimentation zones, and the three sedimentation zones all absorb water from the middle and enter water from the top.

[0018] Furthermore, the DC fan is powered by a battery, a wind turbine or a photovoltaic panel.

[0019] Furthermore, it also includes a wind-solar hybrid controller, an Internet controller and a liquid level meter, wherein the liquid level meter is arranged in the closed container to monitor the liquid level in the closed container;

[0020] The wind turbine, photovoltaic panel, and battery are electrically connected to the wind-solar hybrid controller, and the wind-solar hybrid controller is electrically connected to the Internet controller and the DC motor respectively, and the Internet controller is also electrically connected to the liquid level meter.

[0021] The beneficial effects of the present invention are:

[0022] 1) The system of the present invention has low power consumption, and the power generation of the "wind-solar complementary" power generation system can be designed to meet the energy consumption of equipment operation.

[0023] 2) The present invention adopts direct current for power supply, does not require inverter conversion, and has low power loss.

[0024] 3) The present invention only uses a DC fan as the power source and oxygenation equipment for sewage treatment and lifting, and does not require agitators, water pumps and other equipment, which greatly saves energy consumption.

[0025] 4) The present invention adopts air pressure gas lift method. Compared with the traditional gas lift method (gas lift method in which the aeration head is set at the bottom of the gas lift pipe), the pressure gas lift method uses much less gas than the traditional gas lift method. In addition, the traditional gas lift method cannot accurately control the gas lift amount, while the pressure gas lift method can accurately measure and control the lift amount through the liquid level. It is convenient to calculate the water volume, select the equipment startup time according to the water volume, and reduce the equipment's fearless operation.

[0026] 5) The front-end multifunctional aerobic tank adopts a three-stage sedimentation process, which can remove most of the particulate organic matter in the sewage. The sludge anaerobic fermentation can remove some pollutants, reduce the aeration volume of the back-end aerobic zone, and save energy.

[0027] 6) The present invention dispatches the equipment according to the solar and wind power generation conditions, so that when the power generation is large, the equipment operating load is large, and when the battery is powered, the equipment operating load is reduced, thereby reducing the energy loss of battery charging and discharging.

[0028] 7) The present invention sets two stirring modes, namely "natural water inlet stirring" and "pulse pressure circulation stirring", in the fixed-bed biofilm anoxic tank, combining slow stirring and high-intensity stirring, thereby improving stirring efficiency while reducing energy consumption; at the same time, the fixed-bed biofilm aerobic sedimentation tank adopts air pressure gas inlet, which greatly reduces energy consumption compared with traditional water pump air lift, reduces dissolved oxygen introduction, and improves carbon source utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of a low-power rural sewage treatment system based on wind-solar complementary power generation in an embodiment of the present invention;

[0030] In the figure, 1. Multifunctional anoxic tank; 2. Fixed-bed biofilm anoxic tank; 3. Fixed-bed biofilm aerobic sedimentation tank; 4. Fan; 5. Adjustment area; 6. Connecting pipe; 7. Aeration device; 8. Two-position five-way solenoid valve; 9. Closed container; 10. Cylindrical cavity; 11. Conical cavity; 12. Basket grille; 13. Sedimentation area; 14. Battery; 15. Wind turbine; 16. Photovoltaic panel; 17. Wind-solar hybrid controller; 18. Internet controller; 19. Liquid level meter. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , the present invention provides a technical solution:

[0033] Example:

[0034] A low-power rural sewage treatment system based on wind-solar complementary power generation, comprising a multifunctional anoxic tank 1, a fixed-bed biofilm anoxic tank 2, a fixed-bed biofilm aerobic sedimentation tank 3 and a fan 4 connected in sequence;

[0035] The liquid level in the fixed-bed biofilm aerobic sedimentation tank 3 is higher than the liquid level in the multifunctional anoxic tank 1, and the fixed-bed biofilm aerobic sedimentation tank 3 is connected to the water inlet of the multifunctional anoxic tank 1 through a reflux pipe;

[0036] The multifunctional oxygen-conducting tank 1 is used to precipitate particulate organic matter in the sewage to the bottom of the multifunctional oxygen-conducting tank 1 through at least one precipitation;

[0037] The multifunctional anoxic tank 1 is provided with a regulating area 5 for temporarily storing sewage after sedimentation treatment, and the regulating area 5 is connected with the fixed bed biofilm anoxic tank 2 through a connecting pipe 6. The sewage entering the fixed bed biofilm anoxic tank 2 through the regulating area 5 makes a circular motion in the fixed bed biofilm anoxic tank 2, thereby naturally stirring the sewage in the fixed bed biofilm anoxic tank 2;

[0038] The multifunctional anoxic tank 1 is provided with three sedimentation areas 13, and the three sedimentation areas 13 absorb water from the middle and enter water from the top. Such a configuration allows the floating matter in the sewage to stay in the sedimentation area 13, thereby removing the floating particles in the sewage. The particles in the original sewage and the biofilm detached in the reflux liquid are precipitated to the bottom of the sedimentation area 13 to form a sludge area, and the organic matter in the particles undergoes hydrolysis reaction or anaerobic digestion under anaerobic conditions, so that a small amount of solid organic matter is converted into dissolved pollutants, and part of the solid organic matter is directly removed by anaerobically generating methane.

[0039] There are nitrates in the return liquid of the "multi-functional aerobic pool 1". Under the action of denitrifying bacteria in the sewage and the bottom mud, the nitrates are oxidized into organic matter, thereby removing part of the nitrates.

[0040] However, due to the limited amount of denitrifying bacteria in the "multifunctional anoxic pool 1", it is generally unable to completely remove nitrates from the sewage, and there are still nitrates in the effluent of the "multifunctional anoxic pool 1"; the "fixed bed carrier filler" in the "fixed bed biofilm anoxic pool 2" is particularly suitable for the growth of denitrifying bacteria, and the remaining nitrates are acted on by denitrifying bacteria on the "fixed bed carrier filler", and the organic matter in the sewage is used to remove nitrates from the sewage.

[0041] The fixed bed biofilm anoxic tank 2 is sealed;

[0042] The bottom of the fixed-bed biofilm aerobic sedimentation tank 3 is provided with an aeration device 7; the bottom of the "fixed-bed biofilm aerobic tank / sedimentation tank" has an aeration system, and aeration can make the tank an aerobic environment, and the "fixed bed" filler can provide a growth environment for aerobic heterotrophic bacteria and nitrifying bacteria. Under the action of aerobic heterotrophic bacteria and nitrifying bacteria, organic matter in the sewage is removed, and ammonia nitrogen is oxidized into nitrate.

[0043] The fixed-bed biofilm aerobic tank is equipped with an adjustable weir and an outlet weir. The sewage has a sedimentation function when it is not aerated. After sedimentation, the sewage is discharged through the outlet weir. On the other hand, the mud discharge pipe in the mud hopper is connected to the top mud discharge area, and the sludge can be discharged under the action of the adjustable weir. Since the liquid level of the "fixed-bed biofilm aerobic tank / sedimentation tank" is higher than that of the "multi-functional anoxic tank 1", the reflux liquid enters the front end of the "multi-functional anoxic tank 1" under the action of gravity, realizing the reflux of the nitrification liquid.

[0044] The fan 4 is connected with the fixed bed biofilm anoxic tank 2 and the fixed bed biofilm aerobic sedimentation tank 3 through pipelines respectively, and a two-position five-way solenoid valve 8 is provided on the pipeline, and the two-position five-way solenoid valve 8 is used to connect the fixed bed biofilm anoxic tank 2 with the fan 4 or connect the fixed bed biofilm anoxic tank 2 with the atmosphere or connect the fan 4 with the aeration device 7; the fan 4 is used to supply air to the aeration device 7 or to supply air to the fixed bed biofilm anoxic tank 2 to compress the sewage in the fixed bed biofilm anoxic tank 2 into the regulating area 5 until the liquid level in the fixed bed biofilm anoxic tank 2 is lower than its water inlet (that is, the pipe mouth of the connecting pipe 6), at which time the fixed bed biofilm anoxic tank 2 is connected with the atmosphere, and the sewage in the regulating tank re-enters the fixed bed biofilm anoxic tank 2, and a reciprocating cycle is performed to stir the sewage in the fixed bed biofilm anoxic tank 2 in a pulsed pressure cycle.

[0045] Or a fixed bed biofilm aerobic sedimentation tank 3, the aforementioned compressed sewage in the fixed bed biofilm anoxic tank 2 enters the regulating area 5 until the liquid level in the fixed bed biofilm anoxic tank 2 is lower than its water inlet, and air is continued to be supplied to the fixed bed biofilm anoxic tank 2, when the liquid in the fixed bed biofilm anoxic tank 2 enters the fixed bed biofilm aerobic sedimentation tank 3 through the water inlet pipe at the bottom thereof, the pressure-type self-lifting of sewage is realized.

[0046] Among them, 1. The fixed bed biofilm anoxic tank 2 is connected to the fixed bed biofilm aerobic sedimentation tank 3 through an inlet pipe, the inlet end of the inlet pipe is located below the outlet pipe of the connecting pipe 6 (here located in the conical cavity 11, the connecting pipe 6 is located in the cylindrical cavity 10), and the outlet end of the outlet pipe is connected to the fixed bed biofilm aerobic sedimentation tank 3. 2. The fan 4 is a DC fan.

[0047] The fixed bed biofilm anoxic tank 2 includes a closed container 9, which includes an upper cylindrical cavity 10 and a lower conical cavity 11. The connecting pipe 6 is arranged along the tangent direction of the cylindrical cavity 10 in the water outlet direction of the closed container 9.

[0048] The connecting pipe 6 is a U-shaped pipe. The "lowest point height of the U-shaped pipe must meet" the requirement of liquid being pressed into the downstream.

[0049] One end of the connecting pipe 6 communicating with the sealed container 9 is located below the highest operating liquid level in the sealed container 9 .

[0050] A basket grille 12 is provided at the water inlet of the regulating zone 5. The basket grille 12 is used to remove large particle pollutants that are not completely removed in the front multifunctional aeration tank 1.

[0051] The DC fan is powered by a battery 14 , a wind turbine 15 or a photovoltaic panel 16 .

[0052] It also includes a wind-solar hybrid controller 17, an Internet controller 18 and a liquid level meter 19, wherein the liquid level meter 19 is arranged in the closed container 9 to monitor the liquid level in the closed container 9;

[0053] The wind turbine 15, photovoltaic panel 16, battery 14 are electrically connected to the wind-solar hybrid controller 17, and the wind-solar hybrid controller 17 is electrically connected to the Internet controller 18 and the DC motor respectively. The Internet controller 18 is also electrically connected to the liquid level meter 19, and the Internet controller 18 is also connected to a cloud server for connecting to web page control or APP control. The wind-solar hybrid controller 17 is used to:

[0054] 1) Record the operating parameters of the wind-solar hybrid power generation system (wind turbines and photovoltaic panels) and provide an external query interface. (Such as: battery power, wind power generation, photovoltaic power generation, wind power generation voltage, current, photovoltaic power generation voltage and current, external power supply voltage, external power supply current, etc.)

[0055] 2) Manage the four independent modules of wind power generation, photovoltaic power generation, battery charging, and external power supply to form a unified entity, hide the system details and provide simple services to the outside world.

[0056] 3) Abnormal handling and alarm (e.g. when the battery is fully charged, cut off charging to avoid overcharging; when the battery is too low, cut off external power supply; diagnose whether the system has abnormalities and issue an alarm).

[0057] The Internet controller 18 is used to:

[0058] 1) Query the operating parameters of the "wind-solar hybrid controller" and adjust the system operation strategy according to its parameters.

[0059] 2) Collect liquid level meter signals to control the fan and two-position five-way battery valve.

[0060] 3) Determine the system working status based on the collected signal and current status, and send out a control signal.

[0061] 4) Upload the collected signals and internal parameters to the "cloud server" and receive control signals from the "cloud server".

[0062] Working principle: (1) Under the natural water inflow state (the fixed bed biofilm anoxic tank 2 is connected to the atmosphere through a two-position five-way valve), when the liquid level in the fixed bed biofilm anoxic tank 2 is higher than the water inlet (connecting pipe 6) height H1 (this parameter is a custom parameter), if the non-stirring time is greater than the preset value T1 (also a custom time, which can be set according to actual needs), the pulse pressure circulation stirring is started:

[0063] The principle of pulse pressure circulation stirring is: switch the two-position five-way valve to connect the fixed bed biofilm anoxic tank 2 with the DC fan, the DC fan supplies air to the fixed bed biofilm anoxic tank 2, the air pressure in the fixed bed biofilm anoxic tank 2 increases, and the sewage in the fixed bed biofilm anoxic tank 2 is pressed into the regulating area 5. When the liquid level in the fixed bed biofilm anoxic tank 2 drops to the water inlet, switch the two-position five-way valve to connect the fixed bed biofilm anoxic tank 2 with the atmosphere, and the sewage in the regulating area 5 is automatically pressed into the fixed bed biofilm anoxic tank 2. In this process, the sewage in the regulating tank will quickly enter the "fixed bed biofilm anoxic tank 2", and under the impact of the water flow, the sewage in the fixed bed biofilm anoxic tank 2 will move in a circle, thereby realizing "pulse pressure circulation stirring". Since the water inlet time from the regulating area 5 to the fixed bed biofilm anoxic tank 2 is short and fast, the stirring intensity is high. Repeating the above actions can realize pulse pressure circulation stirring.

[0064] (2) When the liquid level of the fixed-bed biofilm anoxic tank 2 reaches the high liquid level H2 (H2>H1), the fixed-bed biofilm aerobic sedimentation tank 3 is in the sedimentation state (i.e., the two-position five-way valve is switched to disconnect the DC fan from the aeration device 7), and this lasts for a period of time T2. At this time, "air lift water inlet" can be started, specifically:

[0065] Switch the two-position five-way valve to connect the fixed-bed biofilm anoxic tank 2 with the DC fan, and the DC fan supplies air to the fixed-bed biofilm anoxic tank 2. The air pressure in the fixed-bed biofilm anoxic tank 2 increases, and the sewage in the fixed-bed biofilm anoxic tank 2 is pressed into the regulating area 5. When the liquid level in the fixed-bed biofilm anoxic tank 2 is lower than the water inlet, continue to supply air. At this time, the liquid level difference at both ends of the connecting pipe 6 becomes larger, and the air pressure in the fixed-bed biofilm anoxic tank 2 continues to increase, and the sewage in the fixed-bed biofilm anoxic tank 2 that is lower than its water inlet is pressed into the fixed-bed biofilm aerobic sedimentation tank 3 through the water inlet pipe, realizing self-lifting.

[0066] When the self-lifting is finished and the liquid level is lower than H3 (H3 is less than H1 and H3 is the liquid level below the water inlet of the fixed bed biofilm anoxic tank 2), the two-position five-way valve is switched to connect the fixed bed biofilm anoxic tank 2 with the atmosphere, and the DC fan is connected with the fixed bed biofilm aerobic sedimentation tank 3. At this time, the regulating area 5 feeds water into the fixed bed biofilm anoxic tank 2, and the DC fan aerates the fixed bed biofilm aerobic sedimentation tank 3.

[0067] (3) After the fixed-bed biofilm aerobic sedimentation tank 3 enters the "treatment demand aeration stage", that is, the DC fan is started and stopped cyclically, such as running for T3 minutes and stopping for T4 minutes. When the "treatment demand aeration stage" accumulates to T5 minutes, it enters the "maintaining microbial minimum growth demand stage" (also letting the DC fan start and stop cyclically, running for T6 minutes and stopping for T7 minutes).

[0068] (4) When the wind-solar hybrid system fails to communicate with the wind-solar hybrid controller, an alarm is issued; when the DC fan is abnormal, an alarm is issued; when the wind-solar hybrid system, the liquid level of the fixed-bed biofilm anoxic tank 2 remains unchanged for a long time (set duration T8), an alarm is issued and the manager is notified through various channels. The manager handles the abnormality in a timely manner. Among them, the aforementioned T1-T8 are all custom times, which are set according to the actual sewage situation and treatment needs.

[0069] (5) Sludge cleaning: Clean the sludge in the “Multi-functional Aeration Pool 1” every 1 to 6 months as needed.

[0070] The present invention sets two stirring modes of "natural water inlet stirring" and "pulse pressure circulation stirring" in the fixed bed biofilm anoxic tank, combining slow stirring and high-intensity stirring, thereby improving stirring efficiency while reducing energy consumption; at the same time, the fixed bed biofilm aerobic sedimentation tank adopts air pressure gas water inlet, which greatly reduces energy consumption compared with traditional water pump air lift, reduces dissolved oxygen introduction, and improves carbon source utilization.

[0071] The present invention has low power consumption; at the same time: (1) low carbon source consumption: TN in the nitrification liquid reflux mainly exists in the form of nitrate. When it refluxes to the multifunctional aerobic tank, it will make the multifunctional aerobic tank have a certain degree of oxidation. Denitrifying bacteria in the bottom mud and sewage can remove part of the nitrate by using the carbon source in the sludge. Because the particulate organic matter in the raw water is used to reduce the nitrate, the carbon source utilization rate is higher than that of the pure precipitation process.

[0072] (2) Low carbon emissions:

[0073] 1) Low energy consumption and carbon source consumption, and its energy consumption and drug consumption correspond to low carbon emissions;

[0074] 2) Since the return liquid enters the "multifunctional aerobic pool", it contains nitrates and dissolved oxygen, making the "multifunctional aerobic pool" less anaerobic than the traditional anaerobic pool, producing less methane and lowering carbon emissions (the greenhouse gas equivalent of methane is more than twenty times that of carbon dioxide).

[0075] (3) Good treatment effect

[0076] This system has a professional reflux pipe compared to the general micro-power agricultural sewage treatment system, and the dissolved oxygen in the reflux liquid is lower than that in the traditional gas lift reflux, and the carbon source is fully utilized, with a good denitrification effect.

[0077] (4) Good system stability:

[0078] 1) Use pressure air to lift sewage to avoid small-flow sewage pumps that are easily blocked and cause the system to fail to operate normally.

[0079] 2) During the sewage lifting process, there are no valves or other blocking devices in the water channel, which reduces the risk of blockage and improves system stability.

[0080] 3) The power source of the whole system is the fan, and the solenoid valve is the air valve. The particles in the air are not enough to block the pipeline, and the overall life stability is strong.

[0081] 4) The system adopts the biofilm method, which does not require deliberate sludge discharge, reduces sludge discharge requirements, and makes the operating water quality more stable.

[0082] 5) There is no sludge return and professional sludge discharge system. The "fixed bed biofilm anoxic tank" and "fixed bed biofilm aerobic tank / sedimentation tank" are not easy to accumulate sludge, thereby clogging the sludge discharge system. It is both stable and convenient.

[0083] 6) The "pressure air lift" water inlet and "pulse pressure circulation stirring" will increase the short-term water flow velocity in the "U"-shaped pipe, making it difficult for mud to accumulate at the bottom of the "U"-shaped pipe, preventing blockage and achieving high operating stability.

[0084] (5) Convenient operation and management:

[0085] 1) The system has few devices and the control logic is integrated in the controller. The operating parameters can be changed remotely, which is convenient for management.

[0086] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A low-power rural sewage treatment system based on wind-solar complementary power generation, characterized by: It includes a multifunctional anoxic tank, a fixed bed biofilm anoxic tank, a fixed bed biofilm aerobic sedimentation tank and a fan which are connected in sequence; The liquid level in the fixed-bed biofilm aerobic sedimentation tank is higher than the liquid level in the multifunctional anoxic tank, and the fixed-bed biofilm aerobic sedimentation tank is connected to the water inlet of the multifunctional anoxic tank through a reflux pipe; The multifunctional aerobic tank is used to precipitate particulate organic matter in the sewage to the bottom of the multifunctional aerobic tank through at least one precipitation; The multifunctional anoxic tank is provided with a regulating area for temporarily storing sewage after sedimentation treatment, and the regulating area is connected with the fixed bed biofilm anoxic tank through a connecting pipe. The sewage entering the fixed bed biofilm anoxic tank through the regulating area makes a circular motion in the fixed bed biofilm anoxic tank, thereby naturally inflowing and stirring the sewage in the fixed bed biofilm anoxic tank; The fixed bed biofilm anoxic tank is sealed; An aeration device is provided at the bottom of the fixed bed biofilm aerobic sedimentation tank; The fan is connected to the fixed-bed biofilm anoxic tank and the fixed-bed biofilm aerobic sedimentation tank through pipelines, respectively. A two-position five-way solenoid valve is provided on the pipeline. The two-position five-way solenoid valve is used to connect the fixed-bed biofilm anoxic tank with the fan or to connect the fixed-bed biofilm anoxic tank with the atmosphere or to connect the fan with the aeration device; the fan is used to supply air to the aeration device or to supply air to the fixed-bed biofilm anoxic tank to compress the sewage in the fixed-bed biofilm anoxic tank into the adjustment area or the fixed-bed biofilm aerobic sedimentation tank; The fixed bed biofilm anoxic tank comprises a closed container, the closed container comprises an upper cylindrical cavity and a lower conical cavity, and the connecting pipe is arranged in the tangent direction of the cylindrical cavity in the water outlet direction of the closed container; The wind turbine is powered by a battery, a wind turbine or a photovoltaic panel; It also includes a wind-solar hybrid controller, an Internet controller and a liquid level meter, wherein the liquid level meter is arranged in the closed container to monitor the liquid level in the closed container; The wind turbine, photovoltaic panel, and battery are electrically connected to the wind-solar hybrid controller, and the wind-solar hybrid controller is electrically connected to the Internet controller and the DC motor respectively, and the Internet controller is also electrically connected to the liquid level meter.

2. According to claim 1, the low-power rural sewage treatment system based on wind-solar complementary power generation is characterized by: The connecting pipe is a U-shaped pipe.

3. According to claim 2, the low-power rural sewage treatment system based on wind-solar complementary power generation is characterized by: One end of the connecting pipe communicating with the closed container is located below the highest operating liquid level in the closed container.

4. According to claim 1, the low-power rural sewage treatment system based on wind-solar complementary power generation is characterized by: A basket grille is provided at the water inlet of the regulating zone.

5. According to claim 1, the low-power rural sewage treatment system based on wind-solar complementary power generation is characterized by: The multifunctional oxygen-conducting pool is provided with three sedimentation zones, and the three sedimentation zones all absorb water from the middle and enter water from the top.

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