Sewage treatment system

Abstract

The utility model provides a sewage treatment system which comprises a filter tank, a water collecting tank and a water outlet tank, sewage in the water collecting tank enters the water outlet tank after being treated by the filter tank through a water inlet pipe, and the filter tank comprises an upward flow reverse granularity filter device. The upward flow reverse granularity filter device comprises a plurality of fiber bundle filter element modules in the filter tank. According to the sewage treatment system provided by the invention, the filter tank, the water collecting tank and the water outlet tank are integrated, and the upward flow reverse granularity filter device is adopted, so that the sewage treatment system has the advantages of efficient filtration, small occupied area, low operation cost, strong impact resistance, high automation degree, stable effluent quality and the like. The high filtering precision and upward flow design of the fiber bundle filtering element module effectively prevent blockage and prolong the filtering period, meanwhile, the system is compact in design and modular in structure, so that the system is suitable for urban areas with strained land, the maintenance is simple and convenient, the energy consumption is low, the system can adapt to water quality change with high pollution load, and the effluent quality is ensured to continuously reach the standard.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, specifically to a wastewater treatment system. Background Technology

[0002] Slightly polluted water bodies refer to water bodies with a relatively low degree of pollution but exceeding environmental benchmark values ​​or drinking water standards. They are mainly caused by agricultural non-point source pollution, domestic sewage, industrial wastewater, and precipitation atmospheric deposition. They are usually characterized by high levels of organic matter, nitrogen and phosphorus nutrients, reduced transparency, and reduced dissolved oxygen.

[0003] In the field of wastewater treatment, with the continuous improvement of environmental protection standards, many cities require that the effluent quality of water purification centers must meet or even exceed the Class A standard of the national standard (GB18918-2002). Furthermore, higher discharge requirements have been imposed on the remediation of polluted natural water bodies and the treatment of effluent from aquaculture water bodies. Traditional ecological filtration technologies, such as constructed wetlands and ecological filter ponds, while showing good results in improving water quality, also have significant drawbacks, such as large land area requirements, susceptibility to clogging and failure, complex construction, numerous devices, high energy consumption, and large investment costs.

[0004] Therefore, how to provide a low-cost, high-efficiency wastewater treatment system with a small footprint has become a technical problem that needs to be solved in this field. Utility Model Content

[0005] In view of this, this application proposes a wastewater treatment system.

[0006] According to this application, a wastewater treatment system is proposed, which includes a filter tank, a collection tank, and an effluent tank. Wastewater in the collection tank is treated by the filter tank through an inlet pipe and then enters the effluent tank. The filter tank includes an upflow reverse particle filter device, which includes multiple fiber bundle filter element modules within the filter tank.

[0007] Specifically, the upward flow reverse particle size filter device further includes an upper end connection part and a lower end connection part that are respectively fixedly connected to both ends of the fiber bundle filter element module, and the upper end connection part and the lower end connection part are fixedly connected inside the filter tank.

[0008] Specifically, the filter pool has a rectangular cross-section and includes: a water collection pit located at the bottom of the filter pool, with its bottom surface lower than the bottom surface of the filter pool; a water inlet device connected to the water inlet pipe and evenly distributed on the bottom surface of the filter pool; and a water collection channel located on the side of the top of the filter pool for temporarily storing treated wastewater.

[0009] Specifically, the water inlet device is evenly distributed on both sides of the water inlet pipe in the filter tank. The water inlet device includes multiple branch water inlet pipes and multiple perforations are provided on the branch water inlet pipes for uniformly distributing water to the filter tank.

[0010] Specifically, the bottom of the water collection pit is connected to a drain pipe, which is used to drain the sewage in the filter tank during backwashing.

[0011] Specifically, the filter tank further includes a drainage tank disposed in the water collection channel, the bottom surface of the drainage tank being lower than the bottom surface of the water collection channel, for draining the sewage in the water collection channel during backwashing; wherein, the side of the drainage tank is provided with an opening connected to the backwash drain pipe; the outer side of the water collection channel is provided with an opening connected to the outlet pipe of the filter tank; wherein, the openings of the water collection channel and the drainage tank are located on the same side.

[0012] Specifically, the openings of the water collection channel and the drainage pool are equipped with water outlet control devices for blocking or opening the water outlet; the water outlets of the water collection channel and the drainage pool are not synchronized; the water outlet control device includes: a valve for blocking the opening and stopping the water outlet; a rotating gear and a control lever for opening and closing the gate.

[0013] Specifically, the collection tank is used to temporarily store sewage to be treated. A water inlet pipe is provided at the top of one end of the collection tank, and an overflow pipe is provided at the bottom of the other end. The overflow pipe is connected to the bottom of the filter tank.

[0014] Specifically, the effluent pool is used to temporarily store treated wastewater. An effluent pool inlet pipe is provided at the top of the effluent pool, which is connected to the effluent pipe of the filter pool. An effluent pool outlet pipe is also provided on the bottom side of the effluent pool for discharging wastewater from the effluent pool. A backwashing inlet pipe is also provided at the top of the effluent pool.

[0015] Specifically, the filter pool further includes: a ladder located on the outer side of the filter pool; a maintenance manhole located on the bottom side of the filter pool; and a walkway slab located on the top surface of the filter pool.

[0016] The wastewater treatment system proposed in this application integrates a filtration tank, a collection tank, and an effluent tank, and employs an upflow reverse particle filtration device (comprising multiple fiber bundle filter element modules). It boasts advantages such as high-efficiency filtration, small footprint, low operating costs, strong shock resistance, high degree of automation, and stable effluent quality. The high filtration accuracy and upflow design of the fiber bundle filter element modules effectively prevent clogging and extend the filtration cycle. Simultaneously, the system's compact design and modular structure make it suitable for land-constrained urban areas, and it is easy to maintain, energy-efficient, and adaptable to changes in water quality under high pollution loads, ensuring that the effluent quality consistently meets standards.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application, and the illustrative embodiments and descriptions thereof are used to explain this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the wastewater treatment system and the bottom of the filter tank according to this application.

[0020] Figure 2 This is a schematic diagram showing the open state of the effluent valve when the wastewater treatment system according to this application is treating wastewater.

[0021] Figure 3 This is a schematic diagram showing the closed state of the drain valve when the wastewater treatment system according to this application is treating wastewater.

[0022] Figure 4 This is a schematic diagram showing the effluent valve in the closed state during backwashing of the wastewater treatment system according to this application.

[0023] Figure 5 This is a schematic diagram showing the open state of the drain valve during backwashing of the wastewater treatment system according to this application.

[0024] Figure 6 This is a schematic diagram showing the inlet valve open and the outlet valve closed when the wastewater treatment system according to this application is treating wastewater.

[0025] Figure 7 This is a schematic diagram showing the state of the inlet valve being closed and the outlet valve being open during backwashing of the wastewater treatment system according to this application.

[0026] Figure 8 This is a schematic diagram of the upper and lower fixing parts of the wastewater treatment system and filter tank according to this application.

[0027] Figure 9 This is a schematic diagram of the wastewater treatment system and the top arrangement of the filter tank according to this application. Detailed Implementation

[0028] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Slightly polluted water bodies refer to water bodies containing low concentrations of pollutants. While the pollution level is not severe, it exceeds normal water quality standards and may pose potential risks to the ecological environment and human health. These water bodies typically exhibit slightly higher levels of organic matter, nitrogen and phosphorus nutrients, heavy metals, or other trace pollutants. Currently, traditional ecological filtration technologies, such as constructed wetlands and ecological filter ponds, are commonly used. Although they have shown good results in improving water quality, their problems cannot be ignored, such as large land area requirements, susceptibility to clogging and failure, complex construction, numerous devices, high energy consumption, and large investment costs.

[0030] Therefore, this application proposes a wastewater treatment system, such as Figure 1 As shown, the wastewater treatment system includes: a filter tank 1, a collection tank 2, and an effluent tank 3. Wastewater in the collection tank 2 is treated by the filter tank 1 through an inlet pipe and then enters the effluent tank 3. The filter tank 1 includes an upward flow reverse particle filtration device, which includes multiple fiber bundle filter element modules 4 within the filter tank 1.

[0031] The bottom side of the above-mentioned water collection tank 2 is provided with a water collection tank inlet pipe, which is used to temporarily store the sewage to be treated and provide a stable source of sewage for the filter tank 1.

[0032] The aforementioned effluent tank 3 is used to temporarily store the wastewater treated by the filter tank 1, to stabilize the effluent quality, and to provide a water source for the backwashing of the filter tank 1. An effluent outlet pipe is also provided on the bottom side of the aforementioned effluent tank 3 to discharge the wastewater in the effluent tank.

[0033] The sewage being transported from the collection tank 2 to the filter tank 1, and the backwash water being transported from the effluent tank 3 to the filter tank 1, are both transported by water pumps installed in the tanks. Using water pumps can achieve high efficiency and stability, provide a certain pressure for the sewage, and allow for precise control of the sewage flow rate.

[0034] The wastewater treatment system proposed in this application integrates a filtration tank, a collection tank, and an effluent tank, and employs an upflow reverse particle filtration device (comprising multiple fiber bundle filter element modules). It boasts advantages such as high-efficiency filtration, small footprint, low operating costs, strong shock resistance, high degree of automation, and stable effluent quality. The high filtration accuracy and upflow design of the fiber bundle filter element modules effectively prevent clogging and extend the filtration cycle. Simultaneously, the system's compact design and modular structure make it suitable for land-constrained urban areas, and it is easy to maintain, energy-efficient, and adaptable to changes in water quality under high pollution loads, ensuring that the effluent quality consistently meets standards.

[0035] To reduce wastewater treatment costs, ensure stable operation of filters, improve filtration efficiency, reduce maintenance costs, and optimize water flow distribution, thereby achieving more efficient and reliable wastewater treatment results, specifically, such as... Figures 2-7As shown, the upward-flow reverse particle filtration device may further include an upper connecting part 41 and a lower connecting part 42, which are respectively fixedly connected to both ends of the fiber bundle filter element module 4. The upper connecting part 41 and the lower connecting part 42 are fixedly connected within the filter tank 1. Fixing the upper and lower ends of the fiber bundle filter element module 4 within the filter tank 1 reduces the wear of the fiber bundle packing, ensures the stability of the fiber bundle filter element module 4, prevents displacement or deformation, and guarantees the filtration effect and long-term service life of the equipment. The fixed design helps to evenly distribute the water flow and prevent short-circuiting, thereby improving filtration efficiency. It also facilitates backwashing and cleaning, simplifies maintenance, and reduces the occurrence of system failures. In addition, the stable arrangement of the fiber bundle filter element module 4 improves the interception capacity of pollutants and ensures the safe and reliable operation of the system.

[0036] The aforementioned upper connecting part 41 is placed on the upper connecting part fixing member 43. The number of the upper connecting part fixing members 43 can be set as needed to ensure that the upper connecting part fixing members 43 stably and smoothly fix the upper end of the fiber bundle filter element module 4. There can be two upper connecting part fixing members 43, symmetrically arranged on both side walls of the filter tank 1; or there can be four, symmetrically arranged on all four side walls of the filter tank 1. The aforementioned lower connecting part 42 is supported to a certain height by a support frame 44. The height of the support frame is set according to actual needs. Figure 8 As shown, the upper connecting part 41 and the lower connecting part 42 are composed of several horizontally parallel elongated structures and elongated structures perpendicular to the horizontally parallel structures, so as to fix the fiber bundle filter element filter assembly 4. The upper connecting part 41 and the lower connecting part 42 can be made of suitable materials that are corrosion-resistant and have a certain load-bearing capacity.

[0037] During wastewater treatment, wastewater flows from bottom to top through the aforementioned fiber bundle filter element module 4. The upper part of the fiber bundle filter element module 4 is more compact than the lower part, and the filtration gap gradually decreases from bottom to top, forming an upward flow reverse particle filtration. During filtration, larger particles are intercepted by the lower, looser fiber bundle filter element module, effectively preventing filter media clogging, while smaller particles are intercepted by the upper, denser fiber bundle filter element module. Furthermore, the water flow from bottom to top ensures that wastewater passes evenly through the fiber bundle filter element, avoiding excessively high or low local flow velocities. During backwashing, the water flow from top to bottom washes away particles attached to the fiber bundles, restoring their filtration performance. This saves on backwashing frequency and water consumption. It can also be used to treat high-turbidity wastewater with low operating costs. The fiber bundle filter element module 4 used in this application can be in an appropriate form, such as a braided single-bundle fiber bundle filter element module or a braided curtain-type fiber bundle filter element module.

[0038] To ensure the proper functioning of the fiber bundle filter module 4, the filter tank 1 can have a rectangular cross-section. This rectangular shape facilitates the installation of the fiber bundle filter module 4. The filter tank 1 may include: a water collection pit 5, located at the bottom of the filter tank 1, with its bottom surface lower than the bottom surface of the filter tank 1; the water collection pit 5 effectively collects settled wastewater and sludge; a water inlet device, connected to the water inlet pipe and evenly distributed on the bottom surface of the filter tank 1, ensuring uniform water flow to the filter layer and guaranteeing the stability and efficiency of the filtration process; and a water collection channel 6, located on the side of the top of the filter tank 1, for temporarily storing treated wastewater and effectively guiding the filtered wastewater out, preventing secondary pollution. The water collection channel 6 is located on one side of the filter tank 1.

[0039] To further ensure uniform water distribution within the filter tank 1 and to guarantee uniform wastewater distribution at the bottom of the fiber bundle filter element module 4, specifically, the water inlet device is evenly distributed on both sides of the water inlet pipe within the filter tank 1. This water inlet device includes multiple branch water inlet pipes, each with multiple perforations for uniform water distribution to the filter tank 1. The water inlet pipe extends from the outside of the filter tank 1 into its interior, and multiple parallel branch water inlet pipes are arranged on both sides of the main water inlet pipe inside the filter tank 1. Multiple perforations are provided at the top of each branch water inlet pipe, ensuring truly uniform water distribution at the bottom of the filter tank 1. The water inlet pipe can enter the filter tank 1 from one side of its bottom side. In this application, to maintain uniform water distribution, the water inlet pipe is positioned in the middle of the bottom side of the filter tank 1 before entering. This achieves uniform water flow distribution. Each perforation can evenly disperse the water flow within the filter tank 1, ensuring uniform water flow within the tank and preventing excessively large or small local water flows, thereby improving the filtration effect. This uniform water distribution design helps improve the overall treatment efficiency of the filtration tank 1, ensuring that the water flow can fully contact the filter media and enhance the water purification effect. At the same time, this structure can also reduce damage to the filter module caused by water flow scouring and extend the service life of the equipment.

[0040] During backwashing, all wastewater in filter tank 1 needs to be emptied to remove particulate matter from filter tank 1 and the fiber bundle filter element module 4. Specifically, the bottom of the water collection pit 5 can be connected to a vent pipe 51 to empty the wastewater in filter tank 1 during backwashing. The water collection pit 5 effectively collects wastewater generated during backwashing, and the vent pipe 51 at the bottom can promptly discharge larger particulate pollutants from the water collection pit 5 and the lower part of the fiber bundle filter element module 4.

[0041] To avoid confusion between treated wastewater and backwash water, the filter tank 1 specifically includes a drainage tank 7 located within the collection channel 6. This optimizes the separation and discharge of wastewater and backwash water. The bottom of the drainage tank 7 is lower than the bottom of the collection channel 6, allowing for the emptying of wastewater from the collection channel 6 during backwashing. The collection channel 6 and drainage tank 7 ensure that treated wastewater and backwash water are separated, preventing cross-contamination. The drainage tank 7 has an opening on its side, connecting to the backwash drain pipe 71. The outer opening of the collection channel 6 connects to the outlet pipe of the filter tank 1, facilitating the effective discharge of treated wastewater and backwash water. The outer surface of the collection channel 6 also has an opening connecting to the outlet pipe of the filter tank 1, allowing for the discharge of treated wastewater from the collection channel 6. This simplifies water flow management and control, enhancing system stability, cleaning effectiveness, and ease of operation.

[0042] To facilitate control of wastewater discharge and backwash water drainage, specifically, the openings of the collection channel 6 and the drainage pool 7 can be equipped with water outlet control devices for blocking or opening the outlets; the water outlets of the collection channel 6 and the drainage pool 7 are asynchronous; the water outlet control device includes: a gate 8 for blocking the opening and stopping the water outlet; a rotating gear 9 and a control lever 10 for opening and closing the gate 8. The above-mentioned water outlet control device provides precise water flow control by controlling the water outlet synchronously. The gate 8 can precisely block or open the outlet, ensuring that the water outlets of the collection channel 6 and the drainage pool 7 are asynchronous, avoiding the mixing of wastewater and backwash water, and reducing cross-contamination. This design improves the system's flexibility and backwashing efficiency, simplifies operation and maintenance, saves energy, and reduces water waste. Simultaneously, asynchronous water outlets avoid water flow interference, enhancing the system's stability and filtration effect.

[0043] To ensure uniform water intake within the filter tank 1, specifically, the collection tank 2 is used to temporarily store wastewater to be treated. A water inlet pipe can be installed at the top of one end of the collection tank 2, and an overflow pipe 11 is installed at the bottom of the other end, connected to the bottom of the filter tank 1. The arrangement of two inlet pipes and an inlet pump within the collection tank 2 increases the wastewater intake volume, improves the wastewater treatment effect, and ensures uniform water distribution at the bottom of the filter tank 1. The overflow pipe 11, connected to the bottom of the filter tank 1, is used to discharge some wastewater when there is a large amount of wastewater inside the filter tank 1, preventing water accumulation.

[0044] The aforementioned inlet pipes can be of a suitable number. In this application, two inlet pipes extend into the collection tank 2, and an inlet pump is connected to the top of each inlet pipe. The two inlet pipes merge into one inlet pipe outside the collection tank 2, and are connected to a compressed air pipe on the inlet pipe outside the filter tank 1. The air compressor provides oxygen to the wastewater in the inlet pipe, allowing the oxygen in the air to quickly mix with the water, thus improving the oxygen dissolution efficiency. The use of oxygen-rich wastewater activates the growth of beneficial bacteria in the fiber bundle filter element module 4, giving the effluent from the filter tank 1 biological activity and facilitating the restoration of the water body's self-purification capacity.

[0045] To ensure proper management and discharge of filtered wastewater, specifically, the effluent tank 3 is used for temporary storage of treated wastewater. An inlet pipe can be installed at the top of the effluent tank 3, which connects to the outlet pipe of the filter tank 1. An outlet pipe can also be installed on the bottom side of the effluent tank 3 to discharge the wastewater. A backwash inlet pipe is also installed at the top of the effluent tank 3. The effluent tank 3 acts as a buffer, preventing unstable water flow or system pressure fluctuations caused by excessively rapid wastewater discharge, while ensuring that the water quality meets standards before discharge. The design of the inlet pipe of the effluent tank 3 ensures that the treated water flows steadily into the effluent tank 3, avoiding unstable water flow or uneven flow after treatment. The design of the outlet pipe of the effluent tank 3 ensures that the water in the effluent tank 3 can be discharged smoothly, avoiding overflow or water accumulation due to excessively high water levels. The location of the drain pipe at the bottom helps to maximize the drainage of water in the tank, keeping the tank clean and empty. With the design of the effluent tank 3, the filter tank 1 will not be discharged directly in a frequent manner, which can realize the temporary storage and stable discharge of sewage, reduce the burden on the pipeline, and extend the service life of the equipment.

[0046] The aforementioned backwash inlet pipes can be of a suitable number. In this application, two backwash inlet pipes are installed, extending into the effluent tank 3. Two backwash pumps provide backwash water for backwashing. The two backwash pipes merge into one pipe outside the effluent tank 3. A relatively high water pressure is required during backwashing to flush out blockages on the fiber bundle filter element module 4, thus achieving the purpose of cleaning the filter tank 1. The backwash pipes are connected to the inlet pipe of the filter tank 1 on the outside of the filter tank 1. During backwashing, the filter tank 1 is backwashed using the inlet pipes.

[0047] like Figure 9As shown, to provide convenient operation and maintenance conditions, the filter tank 1 may further include: a ladder 12 located on the outer side of the filter tank 1; a manhole 13 located on the bottom side of the filter tank 1; and a walkway 14 located on the top surface of the filter tank 1. The ladder 12 allows personnel to safely and conveniently enter the filter tank 1, the manhole 13 facilitates the inspection and maintenance of the bottom equipment, and the walkway 14 provides a safe passage to the top surface of the filter tank 1, ensuring that personnel can efficiently and safely conduct daily inspections and operations. These designs improve the operational safety and efficiency of the system, simplify equipment maintenance, and extend the service life of the filter tank 1.

[0048] The aforementioned wastewater treatment system is also equipped with a PLC control box and a power distribution box for controlling the operation of the wastewater treatment system.

[0049] The wastewater treatment system proposed in this application is used as follows:

[0050] Wastewater treatment stages:

[0051] The effluent control device closes the outlet of drainage tank 7 and opens the outlet of collection channel 6. Wastewater to be treated enters through the inlet pipe at the bottom of filter tank 1 via the collection tank 2 and the perforated inlet pipe. The wastewater flows from bottom to top through the fiber bundle filter module 4, collection channel 6, and outlet pipe into the effluent tank 3. When wastewater needs to be discharged from effluent tank 3, the outlet pipe of effluent tank 3 is opened to discharge the treated wastewater. During water intake, the outlet valve of collection channel 6 is open, and the outlet valve of drainage tank 7 is closed. Both the outlet and outlet valves are controlled by a PLC control box.

[0052] Backwashing stage:

[0053] An ultrasonic level gauge is installed inside the filter tank 1. When the water level in the filter tank 1 rises to the backwash water level, the PLC control box is used to shut down the inlet pump in the collection tank 2 and open the electric knife gate on the vent pipe 51. The larger particles of pollutants in the lower part of the loose fiber bundle filter element module in the filter tank 1 are quickly discharged by using the water level difference between the collection pit 5 and the bottom of the filter tank 1. After the filter tank 1 is emptied, the electric knife gate of the vent pipe 51 is closed. At the same time, the water outlet control device installed on the water collection channel 6 in the filter tank 1 is started, the water outlet valve of the water collection channel 6 is closed, the drainage valve of the drainage tank 7 is started, and then the water inlet pump in the water outlet tank 3 is started to lift the water in the water outlet tank 3 into the filter tank 1. The water is distributed through the water inlet pipe and the perforated water inlet pipe installed at the bottom of the tank. From bottom to top, the water passes through the sparse fiber bundle interception module and the dense fiber bundle interception module. Under the flushing of the high flow rate and high head water flow, the pollutants intercepted by the packing of the sparse fiber bundle interception module and the dense fiber bundle interception module are discharged into the drainage well through the drainage tank 7 with the water flow.

[0054] The preferred embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0055] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0056] Furthermore, various different embodiments of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed by this invention.

Claims

1. A sewage treatment system, the sewage treatment system comprising: The filter tank (1), the water collecting tank (2) and the effluent tank (3), the sewage in the water collecting tank (2) is treated by the water inlet pipe through the filter tank (1) and then enters the effluent tank (3), characterized in that the filter tank (1) comprises an upward flow reverse particle size filtering device comprising a plurality of fiber bundle filter element modules (4) in the filter tank (1).

2. The sewage treatment system of claim 1, wherein, The upward flow reverse particle size filtering device further comprises an upper end connecting part (41) and a lower end connecting part (42) fixedly connected to both ends of the fiber bundle filter element module (4) respectively, and the upper end connecting part (41) and the lower end connecting part (42) are fixedly connected in the filter tank (1).

3. The sewage treatment system of claim 1, wherein, The cross section of the filter tank (1) is rectangular, and the filter tank (1) comprises: A water collecting pit (5) is arranged at the bottom of the filter tank (1), and the bottom surface of the water collecting pit (5) is lower than the bottom surface of the filter tank (1); The water inlet device is in communication with the water inlet pipe and is uniformly distributed on the bottom surface of the filter tank (1); A water collecting channel (6) is arranged on the side surface of the top end of the filter tank (1) and is used for temporarily storing the treated sewage.

4. The sewage treatment system of claim 3, wherein, The water inlet device is uniformly distributed on both sides of the water inlet pipe in the filter tank (1), The water inlet device comprises a plurality of sub-water inlet pipes, and a plurality of perforations are arranged on the sub-water inlet pipes for uniformly distributing water to the filter tank (1).

5. The sewage treatment system of claim 3, wherein, The bottom of the water collecting pit (5) is communicated with a vent pipe (51) for emptying the sewage in the filter tank (1) during backwashing.

6. The sewage treatment system of claim 3, wherein, The filter tank (1) further comprises a drainage tank (7) arranged in the water collecting channel (6), the bottom surface of the drainage tank (7) is lower than the bottom surface of the water collecting channel (6), and the drainage tank (7) is used for emptying the sewage in the water collecting channel (6) during backwashing; wherein the side surface of the drainage tank (7) is provided with an opening in communication with a backwashing drainage pipe (71); An opening is arranged on the outer side surface of the water collecting channel (6) and is in communication with the water outlet pipe of the filter tank (1); wherein The openings of the water collecting channel (6) and the drainage tank (7) are arranged on the same side surface.

7. The sewage treatment system of claim 6, wherein, The openings of the water collecting channel (6) and the drainage tank (7) are provided with water outlet control devices for blocking or opening the water outlet; the water outlets of the water collecting channel (6) and the drainage tank (7) are not synchronous; The water outlet control device comprises a gate (8) for blocking the opening and stopping the water outlet; A rotating gear (9) and a control rod (10) for opening and closing the gate (8).

8. The sewage treatment system of claim 1, wherein, The water collecting tank (2) is used for temporarily storing the sewage to be treated, one end of the bottom of the water collecting tank (2) is provided with a water collecting tank (2) water inlet pipe, and the other end of the bottom is provided with an overflow pipe (11), the overflow pipe (11) is in communication with the bottom end of the filter tank (1).

9. The sewage treatment system of claim 1, wherein, The effluent tank (3) is used for temporarily storing the treated sewage, The top end of the effluent tank (3) is provided with an effluent tank (3) water inlet pipe, and the effluent tank (3) water inlet pipe is in communication with the water outlet pipe of the filter tank (1), The bottom side of the effluent tank (3) is further provided with an effluent tank (3) water outlet pipe for discharging the sewage in the effluent tank (3), The top end of the water outlet pool (3) is further provided with a backwashing water inlet pipe.

10. The wastewater treatment system of claim 1, wherein, The filter pool (1) further comprises: a ladder (12) arranged on the outer side of the filter pool (1); An inspection manhole (13) arranged on the bottom side of the filter pool (1); A walkway plate (14) arranged on the top surface of the filter pool (1).

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