Rural domestic sewage treatment device

Abstract

This invention discloses a rural domestic sewage treatment device, comprising: at least three sets of cylindrical reaction tanks. An inclined plate is installed between the bottom and sidewall of the inner cavity of the reaction tank, dividing the inner cavity into a filtration chamber and a reaction chamber. Two filter plates are horizontally arranged in the middle of the filtration chamber, with filter media filling the space between the filter plates. A water collection pipe is installed at the bottom of the filtration chamber, connected to a drain pipe, which extends outside the reaction tank. A blower and a flushing tank are installed outside the reaction tank. The blower is connected to the drain pipe via an air supply pipe. The upper and lower parts of the flushing tank are connected to the drain pipe via a flushing tank inlet pipe and a flushing tank outlet pipe. A flushing vent valve is installed on the air supply pipe, a flushing inlet valve is installed on the flushing tank inlet pipe, and a flushing pump and a flushing outlet valve are installed on the flushing tank outlet pipe. When the filter plates and filter media become clogged in the reaction tank, a combination of water and air backflushing can be used to flush the filter plates and filter media, preventing clogging and ensuring efficient sewage treatment.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a rural domestic wastewater treatment device. Background Technology

[0002] Currently, the design scale of rural domestic sewage treatment facilities is estimated based on the water consumption of the rural resident population. During holidays and festivals, the population typically increases significantly, a phenomenon known as population tides, leading to a substantial increase in sewage volume. To mitigate the pollution caused by this phenomenon, the main solution implemented in various regions is to increase the volume of equalization tanks in sewage treatment plants. However, the volume of these equalization tanks is generally insufficient, resulting in minimal pollution mitigation. This is because population fluctuations before and after population tides are significant, requiring large equalization tank volumes, resulting in high construction costs, excessive land occupation, and unsustainable projects. Furthermore, the volume and quality of rural domestic sewage are affected by rainy weather. During rainy days, rural domestic sewage pipe networks are mixed with rainwater to varying degrees, leading to an increase in the volume of sewage entering sewage treatment plants. However, the concentration of pollutants in the water is not high, causing the sewage treatment plants to operate beyond their capacity. After the sewage enters the biological treatment facilities, the low pollutant concentration cannot meet the needs of microorganisms during normal operation, resulting in reduced microbial activity. At the same time, the increased water volume reduces the surface load of the sedimentation tank, causing sewage to be discharged directly without sufficient sedimentation, resulting in high suspended solids in the effluent and substandard effluent quality. Furthermore, the number of rural domestic sewage operation and maintenance personnel is limited, and sewage treatment equipment should be highly automated and have a simple structure.

[0003] To address the above issues, Chinese invention patent application number 201611023822.7 discloses a continuous flow SBR wastewater treatment device, including a tank. Inside the tank are a reaction tank and a three-phase separator. A sludge tank is located at the bottom of the tank, with discharge outlets on both sides. A filter screen to prevent sludge from floating is installed at the top of the sludge tank. Microporous aerators are installed at the bottom of the reaction tank, with an air duct on one side and a blower on the other. An agitator is installed at the top of the tank. A sedimentation tank is located at the top of the three-phase separator, with a filter at the bottom. A filtration zone is located on one side of the filter, and a solid-gas-liquid separation zone is located on the other side. The three-phase separator separates digester gas, digester liquid, and sludge particles. Digester gas is discharged through an exhaust port, while sludge particles slide into the sludge tank via a conical sliding plate. A filter screen to prevent sludge from floating is installed at the top of the sludge tank.

[0004] However, this SBR wastewater treatment device is a continuous flow system and does not have its own regulating capacity, so an equalization tank needs to be set up at the front end; after long-term use, the filter screen is easily clogged by sludge and cannot be self-cleaned online, making manual removal difficult and the cleaning cycle short; the equipment cannot effectively adjust the operating parameters according to the characteristics of the influent, so as to achieve the standard discharge of wastewater when working in rainy weather. Summary of the Invention

[0005] This invention provides a rural domestic sewage treatment device, which aims to solve the problems of existing SBR sewage treatment devices having no adjustment capacity, being unable to self-clean their internal filters online, and causing sewage to exceed standards during rainy days.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A rural domestic sewage treatment device includes: at least three sets of cylindrical reaction tanks. An inclined plate is installed between the bottom and sidewall of the inner cavity of each reaction tank, dividing the inner cavity into a filtration chamber and a reaction chamber. Two filter plates are horizontally arranged in the middle of each filtration chamber, with filter media filling the space between the plates. A water collection pipe is installed at the bottom of each filtration chamber, connecting to a drain pipe that extends to the outside of the reaction tank. A reaction tank outlet valve is installed on the side of the drain pipe closest to the reaction tank, and a main outlet valve is installed on the side of the drain pipe furthest from the reaction tank. A float is connected to the upper part of each reaction chamber via a rope. The float is hollow inside, with water inlet channels on the left and right sidewalls of its inner cavity. A flexible hose is connected to the bottom of the float's inner cavity, extending to the outside of the reaction tank and connecting to one end of the filter chamber inlet pipe. Two branches are provided at the other end of the filter chamber inlet pipe. One branch is connected to the space above the upper filter plate in the filter chamber, and the other branch is equipped with a flushing drain valve and connected to the drainage inspection well. A filter chamber inlet valve is provided before the branch of the filter chamber inlet pipe. The bottom of the reaction chamber is connected to the reaction tank inlet pipe. A blower and a flushing tank are also provided outside the reaction tank. The blower is connected to the drain pipe through an air supply pipe. The upper and lower parts of the flushing tank are connected to the drain pipe through the flushing tank inlet pipe and the flushing tank outlet pipe, respectively. The connection point between the air supply pipe, the flushing tank inlet pipe, and the flushing tank outlet pipe and the drain pipe is located between the reaction tank outlet valve and the main outlet valve. A flushing vent valve is provided on the air supply pipe. A flushing inlet valve is provided on the flushing tank inlet pipe. A flushing pump and a flushing outlet valve are provided on the flushing tank outlet pipe.

[0008] Furthermore, the water collection pipe includes several perforated pipes and a connecting pipe. One end of each perforated pipe is connected to the bottom of the inclined plate. The several perforated pipes are evenly distributed radially around the center of the circle surrounded by the inclined plate. The other end of each perforated pipe is connected to the connecting pipe, which is connected to the drain pipe. Several perforations are evenly opened on the perforated pipe.

[0009] Furthermore, an aeration device is horizontally installed in the middle of the reaction chamber. Several branches are opened between the air inlet of the air supply pipe and the flushing vent valve, and pass through the corresponding reaction tank to connect with the aeration device inside the reaction tank. An aeration valve is installed on each branch connected to the aeration device.

[0010] Furthermore, a water distribution pipe is installed at the outlet of the reaction tank inlet pipe that connects to the reaction chamber, and several nozzles are evenly arranged on the water distribution pipe.

[0011] Furthermore, the bottom of the reaction chamber is connected to a sludge discharge pipe, which extends to the outside of the reaction tank. A branch sludge discharge valve is installed on the side of the sludge discharge pipe closest to the reaction tank, and a main sludge discharge valve is installed on the side of the sludge discharge pipe furthest from the reaction tank.

[0012] Furthermore, an inlet valve is installed on the side of the inlet pipe of the reaction tank that is close to the reaction tank, and an inlet pump is installed on the side of the inlet pipe of the reaction tank that is away from the reaction tank.

[0013] Furthermore, a filter screen is provided at the inlet of the water inlet channel in the float.

[0014] Furthermore, the angle between the inclined plate and the bottom surface of the reaction tank is 55°-75°.

[0015] Furthermore, a water quality analyzer is installed outside the reaction tank to detect the influent water quality of the inlet pipe and the effluent water quality of the outlet pipe.

[0016] Furthermore, a controller is installed outside the reaction tank. The water quality detector, inlet pump, inlet valve, branch sludge discharge valve, main sludge discharge valve, flushing pump, flushing outlet valve, flushing inlet valve, blower, aeration valve, flushing vent valve, reaction tank outlet valve, main outlet valve, filter chamber inlet valve, and flushing drain valve are all connected to the controller.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] 1. The rural domestic sewage treatment device of the present invention collects treated sewage through a flushing tank. When the filter media and filter plates in the filtration chamber of the reaction tank become clogged, the treated sewage in the flushing tank is pumped into the filtration chamber by a flushing pump to clean the filter media and filter plates. The special design of the water collection pipe ensures that the cleaning water flow thoroughly and evenly cleans the filter media and filter plates. It is highly practical, and the flushing tank collects the sewage treated in the reaction tank, so there is no need to add clean water, which is very convenient. The air supply pipe is connected to the drain pipe, and the staff can also perform online flushing of the filter media and filter plates by combining air and water, further ensuring that the filter media is not clogged.

[0019] 2. The rural domestic sewage treatment device of the present invention uses a float instead of a traditional decanter for drainage, which consumes less energy. By optimizing the pipeline design, multiple pools can share a set of blowers, inlet pumps and flushing pumps, which can reduce project investment and subsequent operation and maintenance costs.

[0020] 3. The rural domestic sewage treatment device of the present invention treats sewage by setting up multiple reaction tanks. Each reaction tank can use the SBR process for sewage treatment. When the sewage volume in rural areas changes greatly due to population ebb and flow, the controller can control the various reaction tanks to work together to increase the sewage treatment capacity. There is no need to build a separate regulating tank, thus solving the problem of large sewage volume changes caused by population ebb and flow.

[0021] 4. The rural domestic sewage treatment device of the present invention controls the operation of various valves, water pumps and blowers through a controller, and can adjust the operating parameters such as aeration intensity, aeration time and sewage sedimentation retention time of the reaction tank. During rainy days, it can effectively reduce the shock load caused by changes in sewage volume and water quality, keep the microbial activity at a high level, and at the same time, sedimentation keeps the surface load constant, which can effectively remove chemical oxygen demand, ammonia nitrogen, total nitrogen, total phosphorus and suspended solids from sewage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of multiple reaction tanks in a rural domestic sewage treatment device according to the present invention;

[0023] Figure 2 This is a schematic diagram of a single reaction tank of a rural domestic sewage treatment device according to the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the float of a rural domestic sewage treatment device according to the present invention;

[0025] Figure 4 This is a side view of the float of a rural domestic sewage treatment device according to the present invention;

[0026] Figure 5 This is a schematic diagram of the water collection pipe of a rural domestic sewage treatment device according to the present invention;

[0027] Figure 6 This is a schematic diagram of the bottom of the reaction tank of a rural domestic sewage treatment device according to the present invention;

[0028] Figure 7 This is a schematic diagram illustrating the COD removal process in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram illustrating the removal of ammonia nitrogen in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram illustrating the removal of TN in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram illustrating the removal of TP in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram illustrating the removal of suspended solids in an embodiment of the present invention.

[0033] In the diagram: 1. Reaction tank; 2. Reaction tank inlet pipe; 3. Inlet pump; 4. Inlet valve; 5. Sludge outlet pipe; 6. Branch sludge outlet valve; 7. Main sludge outlet valve; 8. Water quality analyzer; 9. Controller; 10. Rinsing tank; 11. Rinsing tank inlet pipe; 12. Rinsing tank outlet pipe; 13. Rinsing pump; 14. Rinsing outlet valve; 15. Rinsing inlet valve; 16. Blower; 17. Air supply pipe; 18. Aeration valve; 19. Rinsing vent valve; 20. Drain pipe; 21. Reaction tank 21. Outlet valve; 22. Main outlet valve; 23. Water collection pipe; 24. Water distribution pipe; 25. Nozzle; 26. Filter plate; 27. Filter media; 28. Inclined plate; 29. ​​Filter chamber; 30. Reaction chamber; 31. Rope; 32. Float; 33. Filter chamber inlet pipe; 34. Filter chamber inlet valve; 35. Flushing drain valve; 36. Hose; 37. Drainage inspection well; 38. Aeration device; 39. Inlet channel; 40. Filter screen; 41. Perforated pipe; 42. Connecting pipe; 43. Perforation. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present application and with reference to the accompanying drawings.

[0035] like Figure 1-3 and Figure 6As shown, a rural domestic sewage treatment device includes: at least three sets of cylindrical reaction tanks 1. An inclined plate 28 is provided between the bottom and sidewall of the inner cavity of each reaction tank 1, dividing the inner cavity of the reaction tank 1 into a filtration chamber 29 and a reaction chamber 30. Two filter plates 26 are horizontally arranged in the middle of the filtration chamber 29, and filter media 27 is filled between the filter plates 26. A water collection pipe 23 is provided at the bottom of the filtration chamber 29, and the water collection pipe 23 is connected to a drain pipe 20, which extends... Extending to the outside of the reaction tank 1, the drain pipe 20 is equipped with a reaction tank outlet valve 21 on the side close to the reaction tank 1, and a main outlet valve 22 on the side away from the reaction tank 1. A float 32 is connected to the upper part of the reaction chamber 30 by a rope 31. The float 32 is hollow inside, and water inlet channels 39 are opened on the left and right side walls of the inner cavity of the float 32. A flexible hose 36 is connected to the bottom of the inner cavity of the float 32. The flexible hose 36 extends to the outside of the reaction tank 1 and is connected to one end of the filter chamber inlet pipe 33. The filter chamber inlet pipe 33 has two branches at the other end. One branch connects to the space above the upper filter plate 26 in the filter chamber 29, and the other branch is equipped with a flushing drain valve 35 and connected to the drainage inspection well 37. A filter chamber inlet valve 34 is provided before the branch of the filter chamber inlet pipe 33. The bottom of the reaction chamber 30 is connected to the reaction tank inlet pipe 2. A blower 16 and a flushing tank 10 are also provided outside the reaction tank 1. The blower 16 is connected to the drain pipe 20 through the air supply pipe 17 for flushing. The upper and lower parts of the tank 10 are connected to the drain pipe 20 through the flushing tank inlet pipe 11 and the flushing tank outlet pipe 12, respectively. The connection point between the air supply pipe 17, the flushing tank inlet pipe 11 and the flushing tank outlet pipe 12 and the drain pipe 20 is located between the reaction tank outlet valve 21 and the main outlet valve 22. A flushing vent valve 19 is installed on the air supply pipe 17, a flushing inlet valve 15 is installed on the flushing tank inlet pipe 11, and a flushing pump 13 and a flushing outlet valve 14 are installed on the flushing tank outlet pipe 12.

[0036] like Figure 5 As shown, the water collection pipe 23 includes several perforated pipes 41 and a connecting pipe 42. One end of each perforated pipe 41 is connected to the bottom of the inclined plate 28. The perforated pipes 41 are radially and evenly distributed around the center of the circle surrounded by the inclined plate 28. The other end of each perforated pipe 41 is connected to the connecting pipe 42, which is connected to the drain pipe 20. Several perforations 43 are evenly provided on the perforated pipes 41. This arrangement can improve the water intake efficiency during water intake and also improve the cleaning efficiency of the cleaning water flow and cleaning gas during filter cleaning.

[0037] like Figure 1-2 As shown, an aeration device 38 is horizontally arranged in the middle of the reaction chamber 30. Several branches are opened between the air inlet of the air supply pipe 17 and the flushing air valve 19 and pass through the corresponding reaction tank 1 to communicate with the aeration device 38 inside the reaction tank 1. An aeration valve 18 is provided on each branch that communicates with the aeration device 38.

[0038] like Figure 2 and Figure 6 As shown, a water distribution pipe 24 is installed at the outlet of the reaction tank inlet pipe 2, which connects to the reaction chamber 30. Several nozzles 25 are evenly arranged on the water distribution pipe 24. The nozzles 25 can evenly spray sewage into the reaction chamber 30, raising the sludge deposited at the bottom of the reaction chamber 30 and redistributing it in the sewage, thus bringing the microorganisms in the sludge into contact with the sewage.

[0039] like Figure 1-2 As shown, the bottom of the reaction chamber 30 is also connected to the sludge discharge pipe 5, which extends to the outside of the reaction tank 1. A branch sludge discharge valve 6 is provided on the side of the sludge discharge pipe 5 closest to the reaction tank 1, and a main sludge discharge valve 7 is provided on the side of the sludge discharge pipe 5 furthest from the reaction tank 1.

[0040] like Figure 1-2 As shown, each of the reaction tank inlet pipes 2 is equipped with an inlet valve 4 on the side closest to the reaction tank 1, and an inlet pump 3 is installed on the side of the reaction tank inlet pipe 2 away from the reaction tank 1. The inlet pump 3 can increase the sewage inlet water pressure and accelerate the inlet efficiency. Different inlet valves 4 correspond to different reaction tanks 1, which can ensure that each reaction tank 1 can work independently.

[0041] like Figure 3-4 As shown, a filter screen 40 is installed at the inlet of the water inlet channel 39 in the float 32. The filter screen 40 can prevent suspended matter on the surface of sewage from entering the interior of the float 32.

[0042] like Figure 2 As shown, the angle between the inclined plate 28 and the bottom surface of the reaction tank 1 is 55°-75°. This prevents sludge from accumulating on the inclined plate 28.

[0043] like Figure 1-2 As shown, a water quality detector 8 is also installed outside the reaction tank 1. The water quality detector 8 is used to detect the influent water quality of the reaction tank inlet pipe 2 and the effluent water quality of the outlet pipe 20.

[0044] like Figure 1-2 As shown, a controller 9 is also installed outside the reaction tank 1. The water quality detector 8, inlet pump 3, inlet valve 4, branch sludge outlet valve 6, main sludge outlet valve 7, flushing pump 13, flushing outlet valve 14, flushing inlet valve 15, blower 16, aeration valve 18, flushing vent valve 19, reaction tank outlet valve 21, main outlet valve 22, filter chamber inlet valve 34, and flushing drain valve 35 are all connected to the controller 9.

[0045] Working principle: The SBR process for treating wastewater in a single reactor 1 involves five steps: influent, aeration, sedimentation, drainage, and sludge removal. When reactor 1 needs to be replenished with wastewater, the corresponding influent valve 4 is opened. Wastewater, pressurized by the influent pump 3 in the influent pipe 2, flows from the bottom of reactor 1 into the reaction chamber 30 within reactor 1 through the influent valve 4. A distribution pipe 24 is installed at the outlet of the influent pipe 2 within the reaction chamber 30. Several nozzles 25, which can be Venturi nozzles, are installed on the distribution pipe 24, spraying the wastewater from the bottom of the reaction chamber 30, thus resuspending the activated sludge at the bottom of the reaction chamber 30 in the wastewater. After the wastewater reaches the required water level, close the inlet valve 4 and open the aeration valve 18. The airflow generated by the blower 16 enters the aeration device 38 in the middle of the reaction chamber 30 through the air supply pipe 17. The aeration device 38 sprays the airflow into the wastewater to aerate it. The inside of the reaction chamber 30 is in an aerobic state. Under the action of microorganisms, the organic matter in the influent is decomposed and consumed, and ammonia nitrogen undergoes nitrification to generate nitrate nitrogen. After the aeration reaches the set time, close the aeration valve 18, and the reaction chamber 30 enters a static sedimentation state, where sludge begins to settle. After the sludge has settled, open the filter chamber inlet valve 34. The clear liquid on the upper layer of the water in the reaction chamber 30 flows in through the inlet channel of the float 32, and then flows through the hose 36 and the filter chamber inlet pipe 33 before flowing into the filter chamber 29. Under the influence of gravity, the liquid flows into the water collection pipe 23 after further filtration by the filter plate 26 and filter media. The reaction tank outlet valve 21 and the flushing inlet valve 15 are opened, and the filtered sewage first flows into the flushing tank 10 through the drain pipe 20 and the flushing tank inlet pipe 11. After the flushing tank 10 is full, the flushing inlet valve 15 is closed and the main outlet valve 22 is opened, and the treated sewage can be discharged through the drain pipe 20.

[0046] When there is too much sludge in the reaction chamber 30, the branch sludge discharge valve 6 and the main sludge discharge valve 7 can be opened, and the sludge at the bottom of the reaction chamber 30 can be discharged through the sludge discharge pipe 5.

[0047] When the filter plates 26 and filter media 27 in the filter chamber 29 become clogged, they can be cleaned by air-water backwashing. The specific operation is as follows: during water backwashing, close the filter chamber inlet valve 34 and the main outlet valve 22, and open the backwash outlet valve 14, the backwash pump 13, and the backwash drain valve 35. The backwash pump 13 pressurizes the liquid inside the backwash tank 10 and flows it through the backwash tank outlet pipe 12, the drain pipe 20, and the collection pipe 23, and sprays it out from the bottom of the filter plates 26, thereby rinsing the filter plates 26 and the filter media 27 inside. The excess wastewater after rinsing flows into the drainage inspection well 37 through the filter chamber inlet pipe 33 and the backwash drain valve 35. After the water backwashing is completed, air backwashing is performed. Close the backwash pump 13 and the backwash outlet valve 14, and open the backwash vent valve 19. The airflow flows through the drain pipe 20 and the collection pipe 23 into the filter chamber 29 to backwash the filter plates 26 and filter media 27. The excess gas is discharged into the drainage inspection well through the filter chamber inlet pipe 33. In practical use, staff can alternate between water rinsing and air rinsing according to the type of filter plate 26 and filter media 27, and determine the rinsing intensity and time.

[0048] All valves, pumps, and water quality analyzers 8 of the wastewater treatment device can be controlled by controller 9. Controller 9 can adjust the specific treatment method of reaction tank 1 and allocate different reaction tanks 1 for wastewater treatment based on the wastewater influent and effluent water quality detected by water quality analyzer 8, thereby increasing the wastewater treatment capacity of the entire wastewater treatment device.

[0049] When nitrogen and phosphorus in wastewater need to be treated, they can be removed by changing the aerobic or anaerobic state of the wastewater. The specific operation is as follows: Open the inlet valve 4 corresponding to reaction tank 1. After the water level reaches 50% of the set maximum water level, close the inlet valve 4 and open the corresponding aeration valve 18 to aerate the wastewater in reaction chamber 30. Under aerobic conditions, organic matter in the wastewater is consumed, and ammonia nitrogen reacts to generate nitrate nitrogen. Then, close the aeration valve 18 and open the inlet valve 4. Simultaneously, dissolved oxygen in reaction tank 1 increases. The process gradually degrades to an anaerobic state. Simultaneously, the wastewater contains a large amount of nitrate nitrogen. With the addition of a carbon source from the influent, a large amount of nitrate nitrogen undergoes denitrification under anaerobic conditions, generating nitrogen gas. Then, the influent valve 4 is closed, and the aeration valve 18 is opened to re-aerate the wastewater inside the reaction chamber 30. The wastewater undergoes nitrification, consuming the organic matter from the newly influent and converting ammonia nitrogen into nitrate nitrogen. After the organic matter and ammonia nitrogen are consumed, the influent and aeration process is repeated until the influent to reaction tank 1 reaches the designed high water level. After sufficient aeration and biochemical reactions, the wastewater enters the sedimentation stage. Under alternating aerobic and anaerobic conditions, microorganisms in the sludge remove nitrogen and phosphorus from the wastewater.

[0050] In Specific Implementation Example 1: The pilot-scale device simulates a sewage treatment plant designed using a coastal plain village as an example. The village has a permanent population of 2000, with approximately 3000 residents during holidays. A section of the sewage pipe network uses a combined sewer system with interception. The pilot-scale device has a design capacity of 320 m³ / d, and the effluent quality meets the Class I standard of the "Water Pollutant Discharge Standard for Rural Domestic Sewage Treatment Facilities" (DB35 / 1869—2019). The influent uses simulated chemical preparation, and the designed influent and effluent volumes and quality are shown in Table 1.

[0051] Table 1

[0052]

[0053]

[0054] Where COD represents chemical oxygen demand, SS represents suspended solids concentration, TN represents total nitrogen, and TP represents total phosphorus.

[0055] The pilot plant uses four reaction tanks, operating at full load for four cycles per day, with each cycle lasting 6 hours. The total influent and aeration time is 4 hours, adjusted according to the influent water quality. Sedimentation takes 1 hour, and effluent takes 1 hour. Each reaction tank has an effective biochemical volume of approximately 100 m³, and the filter media is fiber ball filter media.

[0056] The experiment was conducted with influent volume and quality adjusted according to normal sunny weather conditions. After the effluent stabilized and met the standards, the influent water quality and volume were configured in four stages: normal sunny weather, rainy weather, holidays, and normal sunny weather. Each stage was run for 7 days, and the effluent conditions were as follows. Figures 7-11 As shown. Due to the instability of the influent water quality, the COD, ammonia nitrogen, TN, TP and suspended solids content of the pilot plant effluent all fluctuated to some extent, but always met the Class I discharge standard of the "Water Pollutant Discharge Standard for Rural Domestic Sewage Treatment Facilities" (DB35 / 1869—2019).

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A rural domestic sewage treatment device, characterized in that, include: At least three sets of cylindrical reaction tanks (1), wherein an inclined plate (28) is provided between the bottom of the inner cavity and the side wall of the reaction tank (1), the inclined plate (28) divides the inner cavity of the reaction tank (1) into a filtration chamber (29) and a reaction chamber (30), two filter plates (26) are horizontally arranged in the middle of the filtration chamber (29), and filter media (27) is filled between the filter plates (26), and a water collection pipe (23) is provided at the bottom of the filtration chamber (29), the water collection pipe (23) is connected to a drain pipe (20) and the drain pipe (20) extends to the outside of the reaction tank (1), the drain pipe ( 20) A reaction tank outlet valve (21) is provided on the side near the reaction tank (1), and a main outlet valve (22) is provided on the side of the drain pipe (20) away from the reaction tank (1). A float (32) is connected to the upper part of the reaction chamber (30) by a rope (31). The float (32) is hollow inside. Water inlet channels (39) are opened on the left and right side walls of the inner cavity of the float (32). A hose (36) is connected to the bottom of the inner cavity of the float (32). The hose (36) extends to the outside of the reaction tank (1) and is connected to one end of the filter chamber inlet pipe (33). (33) Two branches are provided at the other end. One branch is connected to the space above the upper filter plate (26) in the filter chamber (29). The other branch is equipped with a flushing drain valve (35) and is connected to the drainage inspection well (37). A filter chamber inlet valve (34) is provided before the branch of the filter chamber inlet pipe (33). The bottom of the reaction chamber (30) is connected to the reaction tank inlet pipe (2). A blower (16) and a flushing tank (10) are also provided outside the reaction tank (1). The blower (16) is connected to the drain pipe (20) through the air supply pipe (17). The flushing tank (10) The upper and lower parts are connected to the drain pipe (20) through the flushing tank inlet pipe (11) and the flushing tank outlet pipe (12) respectively. The connection point between the air supply pipe (17), the flushing tank inlet pipe (11) and the flushing tank outlet pipe (12) and the drain pipe (20) is located between the reaction tank outlet valve (21) and the main outlet valve (22). A flushing air valve (19) is provided on the air supply pipe (17), a flushing inlet valve (15) is provided on the flushing tank inlet pipe (11), and a flushing pump (13) and a flushing outlet valve (14) are provided on the flushing tank outlet pipe (12). The water collection pipe (23) includes several perforated pipes (41) and a connecting pipe (42). One end of each perforated pipe (41) is connected to the bottom of the inclined plate (28). The several perforated pipes (41) are evenly distributed radially around the center of the circle surrounded by the inclined plate (28). The other end of each perforated pipe (41) is connected to the connecting pipe (42). The connecting pipe (42) is connected to the drain pipe (20). Several perforations (43) are evenly opened on the perforated pipe (41). A controller (9) is also provided outside the reaction tank (1). The flushing pump (13), flushing outlet valve (14), flushing inlet valve (15), blower (16), flushing vent valve (19), reaction tank outlet valve (21), main outlet valve (22), filter chamber inlet valve (34) and flushing drain valve (35) are all connected to the controller (9).

2. The rural domestic sewage treatment device according to claim 1, characterized in that, An aeration device (38) is horizontally arranged in the middle of the reaction chamber (30). Several branches are opened between the air inlet of the air supply pipe (17) and the flushing air valve (19) and pass through the corresponding reaction tank (1) to communicate with the aeration device (38) inside the reaction tank (1). An aeration valve (18) is provided on each branch that communicates with the aeration device (38).

3. A rural domestic sewage treatment device according to claim 2, characterized in that, A water distribution pipe (24) is installed at the outlet of the reaction tank inlet pipe (2) which connects to the reaction chamber (30). Several nozzles (25) are evenly arranged on the water distribution pipe (24).

4. A rural domestic sewage treatment device according to claim 3, characterized in that, The bottom of the reaction chamber (30) is also connected to the mud discharge pipe (5), which extends to the outside of the reaction tank (1). A branch mud discharge valve (6) is provided on the side of the mud discharge pipe (5) close to the reaction tank (1), and a main mud discharge valve (7) is provided on the side of the mud discharge pipe (5) away from the reaction tank (1).

5. A rural domestic sewage treatment device according to claim 4, characterized in that, The inlet pipe (2) of the reaction tank is equipped with an inlet valve (4) on the side close to the reaction tank (1), and an inlet pump (3) is installed on the side of the inlet pipe (2) away from the reaction tank (1).

6. A rural domestic sewage treatment device according to claim 5, characterized in that, A filter screen (40) is provided at the inlet of the water inlet channel (39) in the float (32).

7. A rural domestic sewage treatment device according to claim 6, characterized in that, The angle between the inclined plate (28) and the bottom surface of the reaction tank (1) is 55°-75°.

8. A rural domestic sewage treatment device according to claim 7, characterized in that, A water quality detector (8) is also installed outside the reaction tank (1). The water quality detector (8) is used to detect the inlet water quality of the reaction tank inlet pipe (2) and the outlet water quality of the drain pipe (20).

9. A rural domestic sewage treatment device according to claim 8, characterized in that, The water quality tester (8), water inlet pump (3), water inlet valve (4), branch sludge discharge valve (6), main sludge discharge valve (7) and aeration valve (18) are all connected to the controller (9).

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