A sewage purification system

Abstract

The utility model relates to the technical field of sewage treatment provides a sewage purification system, including collecting jar, purification tank and liquid storage jar, and collecting jar has water inlet, and the inside filling of collecting jar has elastic filler to form anaerobic bacteria bed, and purification tank forms at least two filter pools that communicate in proper order, and liquid storage jar has water outlet, and liquid storage jar communicates with filter pool through pipeline, wherein, two filter pools are first filter pool and second filter pool respectively, and the water distribution pipe is arranged in first filter pool, and the water distribution pipe extends along the water flow direction of purification tank and communicates with collecting jar to distribute sewage evenly to first filter pool, and the reflux pipe is arranged in second filter pool, and at least partial section of reflux pipe extends to first filter pool to reflux part of treatment water in liquid storage jar to purification tank. The utility model highly integrates anaerobic treatment, biological filter pool, reflux dephosphorization and pretreatment interception and the like function, can be installed in the ground, and is applicable to multiple application scenes.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, specifically to a wastewater purification system. Background Technology

[0002] With the acceleration of urbanization and the advancement of rural living environment improvement, the treatment of domestic sewage has received increasing attention. Traditional sewage treatment processes mostly adopt activated sludge or biofilm processes, which, although achieving good treatment results, generally suffer from high construction costs, complex operation and management, and high energy consumption, making them particularly unsuitable for decentralized, small-scale sewage treatment scenarios.

[0003] In recent years, buried integrated wastewater treatment devices based on biofilm technology have been widely used in rural areas, residential communities, and scenic spots due to their advantages such as compact structure, stable operation, and simple maintenance. Among these, anaerobic-aerobic (A / O) or anaerobic-anoxic-aerobic (A² / O) combined processes are often used to achieve organic matter removal and denitrification. In these devices, an anaerobic zone is typically set up for preliminary degradation and denitrification of organic matter, followed by further removal of pollutants through aerobic units such as biological filters.

[0004] However, existing integrated wastewater treatment devices still have some technical shortcomings: First, the front-end anaerobic zone often uses a simple sedimentation or hydrolysis acidification structure, resulting in insufficient microbial attachment carriers and unstable treatment efficiency; second, uneven water distribution in the biological filter can easily cause short-circuiting or local blockage, affecting the uniform growth of the biofilm; third, the return system often relies on external pumping equipment, which is complex in structure, energy-intensive, and difficult to control precisely; fourth, the filter media is prone to loss or caking, making maintenance difficult and resulting in a short service life. Furthermore, wastewater often contains a large amount of suspended solids and fibrous impurities. Without effective pretreatment measures, this can easily cause blockage of subsequent packing materials and siltation of water distribution pipelines, affecting the long-term stable operation of the entire system. Therefore, there is an urgent need for a wastewater treatment device with a reasonable structure, stable operation, easy maintenance, and good denitrification capacity, especially suitable for the on-site treatment and reuse of decentralized domestic wastewater. Utility Model Content

[0005] This invention provides a wastewater purification system to solve the problems existing in the background art. The specific implementation is as follows: A wastewater purification system includes a collection tank having an inlet, the collection tank being filled with elastic packing material to form an anaerobic bacterial bed; A purification tank, wherein the purification tank comprises at least two filter pools connected in sequence, and the filter pools are connected to a collection tank via pipes; A liquid storage tank having an outlet, the liquid storage tank being connected to the filter tank via a pipeline; The two filter tanks are the first filter tank and the second filter tank. The first filter tank is equipped with a water distribution pipe that extends along the water flow direction of the purification tank and is connected to the collection tank to distribute the sewage evenly to the first filter tank. The second filter is equipped with a return pipe, at least a section of which extends into the first filter to return a portion of the treated water in the storage tank to the purification tank.

[0006] As a further embodiment of this utility model, both the first and second filter tanks are filled with filter media. The filter media is packaged in multiple mesh bags to form independent mesh bag filter media units, and these units are used as basic modules to fill the filter bed of the filter tank layer by layer.

[0007] As a further embodiment of this utility model, the bottom of the purification tank is provided with a supporting base plate, the surface of which is provided with a plurality of evenly distributed water permeable holes. A water storage grid is formed between the supporting base plate and the purification tank. The water storage grid is connected to the outlet of the second filter tank through water passage holes, so as to collect the water treated by the filter tank and guide it to the storage tank.

[0008] As a further embodiment of this utility model, both the water distribution pipe and the return pipe are cross-shaped weir-type water distributors. The cross-shaped weir-type water distributor is connected to the inner wall of the purification tank and has multiple evenly distributed water distribution holes, configured to allow water flowing through the water distributor to be discharged through the water distribution holes.

[0009] As a further embodiment of this utility model, the distance between two adjacent water distribution holes on the cross-shaped weir flow water distributor in the second filter tank is smaller than the distance between two adjacent water distribution holes on the cross-shaped weir flow water distributor in the first filter tank.

[0010] As a further embodiment of this utility model, the collection tank is provided with at least two sewage treatment compartments, and adjacent sewage treatment compartments are connected by water pipes to achieve step-by-step sedimentation and anaerobic treatment of sewage.

[0011] As a further embodiment of this utility model, a filter brush is provided inside the water pipe, and the filter brush is distributed sequentially along the direction of the water pipe.

[0012] As a further embodiment of this utility model, a basket grid is provided near the inlet of the collection tank to intercept large solid particles in the sewage. The basket grid includes a body and a basket, and the basket and the body are detachably connected by a connecting structure.

[0013] As a further embodiment of this utility model, the connection structure includes a first buckle and a second buckle. The second buckle is disposed on the basket, and the first buckle is disposed on the body and surrounds the body to form a slot for receiving the second buckle. The basket and the body are connected by snapping the first buckle into the slot.

[0014] As a further embodiment of this utility model, the basket is provided with a lifting rod, which extends along the axial direction of the basket and protrudes to the outside of the collection tank.

[0015] Due to the adoption of the above technical solutions, the beneficial technical effects of this utility model are: 1. This utility model highly integrates functions such as anaerobic treatment, biological filter, reflux dephosphorization and pretreatment interception. It has a compact structure, can be buried underground, and is suitable for various application scenarios such as domestic sewage, rural decentralized sewage treatment and scenic area wastewater. 2. This utility model sets up a mesh bag filter media unit in the first and second filter tanks and configures a multi-stage anaerobic bacterial bed in the collection tank, thereby significantly increasing the microbial attachment area, effectively improving the organic matter degradation capacity and denitrification efficiency, and ensuring stable system operation and reliable treatment effect; 3. This utility model sets up a cross-shaped weir-flow water distribution pipe in the first filter tank to achieve uniform water distribution of sewage. In the second filter tank, a cross-shaped weir-flow return pipe with a smaller spacing between the water distribution holes is set up to return part of the treated water in the storage tank to the purification tank. This not only promotes the uniform progress of the denitrification reaction, but also achieves efficient phosphorus removal of the return water, thereby further ensuring that the effluent water quality is stable and meets the standards. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a wastewater purification system according to a specific embodiment of the present invention; Figure 2 This is a top view of a wastewater purification system according to a specific embodiment of the present invention; Figure 3 This is a cross-sectional view of a wastewater purification system according to a specific embodiment of the present utility model; Figure 4 This is a cross-sectional view of the collection tank in a specific embodiment of the present invention; Figure 5 This is a cross-sectional view of the purification tank in a specific embodiment of the present invention; Figure 6 This is a cross-sectional view of the liquid storage tank in a specific embodiment of this utility model; Figure 7 This is an exploded view of the basket grille in a specific embodiment of the present utility model; Figure 8 This is a cross-sectional view of the stop structure in a specific embodiment of the present utility model; Figure 9 This is a wastewater treatment flow chart of a wastewater purification system according to a specific embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Collection tank; 2. Inlet pipe; 3. First pipe; 4. Purification tank; 5. Second pipe; 6. Third pipe; 7. Storage tank; 8. Outlet pipe; 9. Overflow pipe; 10. Lifting rod; 11. Basket grille; 12. First flow regulating valve; 13. Manure pipe; 14. Elastic packing material; 15. Water pipe; 16. Mesh bag filter unit; 17. Diversion pipe; 18. Water flow plate; 19. Return pipe; 20. Water pump; 21. Water level regulating valve; 22. Second flow regulating valve. 101. Water collection chamber; 102. Anaerobic chamber. 401. First filter bed; 402. Second filter bed; 403. Support base plate; 404. Water permeable hole. 1101, First buckle; 1102, Limiting flange; 1103, Stop structure; 1104, Basket; 1105, Guide surface; 1106, Second buckle; 1107, Slide groove; 1108, Spring; 1109, Slide rod. Detailed Implementation

[0018] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0020] Combination Figures 1 to 8 As shown, this utility model provides a sewage purification system, including a collection tank 1, a purification tank 4, and a storage tank 7. The collection tank 1, purification tank 4, and storage tank 7 are arranged sequentially from left to right in the installation layout. The tanks are connected sequentially by pipes to form a complete sewage treatment process, realizing integrated treatment of sewage from collection, pretreatment, biodegradation to effluent storage and reuse.

[0021] In this embodiment, the collection tank 1, purification tank 4 and storage tank 7 are all made of independent high-density polyethylene (HDPE) tanks, and the top of each tank is set with an open structure to facilitate the observation and maintenance of the internal operating status during equipment operation.

[0022] Specifically, collection tank 1 is used to collect domestic sewage or other organic wastewater. Its main body is a sealed, corrosion-resistant container that can be buried underground. An inlet pipe 2 is located on the upper side of one side of collection tank 1. The inlet pipe 2 penetrates the side wall of the tank and extends into its interior, with its outer end forming an inlet for connection to an external sewage network or drainage pipe. After entering collection tank 1 through the inlet, the sewage first undergoes preliminary sedimentation and hydrolysis acidification treatment.

[0023] In this embodiment, as Figure 4 As shown, the inside of the collection tank 1 is divided into at least two wastewater treatment compartments by a vertically arranged water-passing plate 18. Specifically, it includes an adjacent water collection compartment 101 and an anaerobic compartment 102. The water collection compartment 101 is located on the wastewater inflow side and is mainly used for preliminary sedimentation of suspended solids and connection of large particulate impurities. The anaerobic compartment 102 is located downstream and is used for deep hydrolysis acidification and anaerobic biodegradation. The water collection compartment 101 and the anaerobic compartment 102 are connected by a water pipe equipped with a filter brush to achieve step-by-step flow of wastewater and interception of impurities. The water pipe includes a sewage pipe 13 and a water pipe 15. Both the sewage pipe 13 and the water pipe 15 are T-shaped pipes, and the material can be selected from PVC or HDPE, which are corrosion-resistant and high-strength. Specifically, the sewage pipe 13 is located on the side of the water collection grid 101 adjacent to the water flow plate 18. One of its openings passes through the water flow plate 18 and connects to the anaerobic grid 102, thus enabling water flow. The other two openings are located in the water collection grid 101: one opening faces the opening of the collection tank 1, allowing operators to observe whether the pipe is blocked during maintenance or sludge removal; the other opening faces the bottom of the collection tank 1, used to introduce the sewage deposited at the bottom into the anaerobic grid 102, enabling sewage flow. The water flow pipe 15 is located in the anaerobic grid 102 and is used to discharge the sewage from the treatment port to the purification tank 4. One opening connects to the outlet of the collection tank 1, and the other two openings have the same structure as the sewage pipe 13. Specifically, one opening faces upwards for easy observation of the water flow and the normal condition of the pipe, and the other opening faces downwards to ensure that water near the bottom of the anaerobic grid 102 can be discharged, avoiding the formation of dead zones.

[0024] Furthermore, the height of the water pipe 15 is higher than that of the manure pipe 13, forming a "low inlet, high outlet" hydraulic flow direction. This structure can effectively prevent the treated water in the anaerobic cell 102 from flowing back to the water collection cell 101, and can ensure that the scum and foam layer in the water collection cell 101 are effectively isolated, allowing only the middle layer of clarified liquid to enter the subsequent treatment unit, thereby improving the stability of the effluent quality.

[0025] In this embodiment, multiple filter brushes are arranged along the manure pipe 13 and water pipe 15. The filter brushes are connected to the pipe walls and can effectively intercept fibrous suspended solids migrating with the water flow, forming a wastewater pretreatment barrier. The filter brush consists of a brush body and a support. The bristles are radially distributed and made of nylon or polypropylene. It has a certain degree of elasticity and can oscillate slightly under the action of water flow, playing a self-cleaning role. Its main function is to intercept slender impurities such as fibers and hairs migrating with the water flow, preventing them from entering the subsequent elastic packing zone or biological filter and causing blockage.

[0026] In this embodiment, a basket grid 11 is provided at the inlet of the water inlet pipe 2 to intercept large solid impurities in the sewage, such as plastic bags, paper scraps, hair, etc., to prevent blockage of subsequent treatment units.

[0027] Furthermore, such as Figure 7 and Figure 8 As shown, the basket grille 11 includes a body connected to the inner wall of the collection tank 1 and a basket 1104. The basket 1104 is installed in the body via a connecting structure, which includes a first buckle 1101 and a second buckle 1106. The first buckle 1101 and the second buckle 1106 are mutually cooperating L-shaped structures. The second buckle 1106 is disposed on the basket 1104 and has a guide surface 1105 facing the insertion direction, which facilitates guiding the basket 1104 into the body during assembly. When the basket 1104 enters the body, the second buckle 1106 slides along the guide surface 1105 through the groove formed by the first buckle 1101 and the body, achieving a locking engagement.

[0028] Specifically, the bottom of the main body is provided with a limiting flange 1102, which is ring-shaped and together with the first buckle 1101 forms a groove for receiving the second buckle 1106. The top of the groove is provided with a stop structure 1103 to limit the axial displacement of the second buckle 1106, thereby preventing the basket 1104 from accidentally coming off under the impact of water flow or its own weight, thus ensuring the stability and safety of the connection. The limiting flange 1102 is provided with a sliding groove 1107 corresponding to the stop structure 1103. The stop structure 1103 is slidably disposed in the sliding groove 1107. A spring 1108 is connected between the sliding groove 1107 and the stop structure 1103. In the naturally extended state of the spring 1108, part of the stop structure 1103 protrudes from the surface of the limiting flange 1102, thereby forming an axial block on the second buckle 1106. When the basket 1104 is inserted, the front end of the second buckle 1106 first contacts the guide surface 1105 on the stop structure 1103. Under the action of the thrust, the stop structure 1103 is pressed to retract into the slide groove 1107 against the spring force, so that the second buckle 1106 can slide smoothly into the groove. After the second buckle 1106 is fully in the groove, the stop structure 1103 automatically resets under the restoring force of the spring 1108 and protrudes again from the surface of the limiting flange 1102, thereby forming an axial limit on the second buckle 1106.

[0029] To improve the sliding stability of the stop structure 1103, a slide rod 1109 is provided on the stop structure 1103. The slide rod 1109 is slidably disposed in the hole of the limiting flange 1102, which plays a supporting and guiding role, thereby ensuring that the stop structure 1103 slides along a predetermined trajectory.

[0030] Preferably, four sets of the first buckle 1101 and the second buckle 1106 are evenly distributed around the circumference of the basket 1104, so that the connection between the basket 1104 and the body is subjected to uniform force, thereby improving the connection stability.

[0031] As a preferred embodiment, a lifting rod 10 is connected to the basket 1104. The lifting rod 10 extends along the axial direction of the basket 1104 and passes through the outside of the collection tank 1. The operator can lift the basket 1104 and clean the slag by pulling the lifting rod 10 without opening the tank, thereby greatly improving the convenience of maintenance.

[0032] In this embodiment, the anaerobic compartment 102 is filled with elastic packing material 14, such as an elastic brush made of polyethylene fiber or polypropylene fiber. The elastic packing material 14 is distributed in the tank in a suspended or freely suspended state, providing a carrier for anaerobic microorganisms to attach and grow, forming a highly efficient anaerobic bacterial bed, realizing the hydrolysis, acidification and partial degradation of organic pollutants (COD, BOD), thereby improving the biodegradability of the effluent.

[0033] In this embodiment, the outlet of the collection tank 1 is connected to the purification tank 4 through the first pipe 3, and the pretreated sewage is transported to the subsequent biological filter unit.

[0034] Specifically, the wastewater pretreated in the collection tank 1 is treated in the purification tank 4, which has at least two filter pools connected in sequence, namely the first filter pool 401 and the second filter pool 402. The first filter pool 401 is connected to the collection tank 1 through the first pipe 3, and the second filter pool 402 is connected to the storage tank 7 through the second pipe 5, thus forming a complete wastewater treatment system.

[0035] To ensure efficient and stable filtration and degradation of wastewater in the biological filter, in this embodiment, both the first filter 401 and the second filter 402 are filled with filter media. The filter media is packaged in multiple mesh bags to form independent mesh bag filter media units 16, which are then layered into the filter bed of the filter bed as basic modules. This modular unit not only facilitates installation, replacement, and maintenance, but also effectively prevents filter media loss or caking, ensuring uniform distribution and stable biological activity during long-term stable operation.

[0036] Specifically, in the first filter tank 401, the mesh bag filter media unit 16 is composed of a mixture of high-density sponge blocks and elastic packing material at a volume ratio of 1:2. The high-density sponge blocks are square blocks approximately 20mm in size, made of polyether or polyurethane-based polymer materials through foaming. They possess high mechanical strength and a rich three-dimensional pore structure, which not only provides ample attachment surface for anaerobic, facultative, and aerobic microorganisms but also effectively traps suspended organic matter, enhancing biosorption capacity. On the other hand, the elastic packing material is an elastic brush made of polyethylene or polypropylene fibers. Due to its large specific surface area and flexibility, it can oscillate slightly under the impact of water flow, helping to prevent premature biofilm detachment and maintain long-term stable biological activity. These two types of filter media are mixed and loaded into a mesh bag as the filter medium for the first filter tank 401 to achieve highly efficient wastewater treatment.

[0037] In the second filter tank 402, the mesh bag filter media unit 16 is composed of calcium carbonate dephosphorization filter media and high-density sponge blocks at a volume ratio of approximately 1:4. The calcium carbonate dephosphorization filter media consists of particles with a diameter of 15–30 mm, containing metal oxides or hydroxides such as iron and aluminum. It can firmly fix phosphate ions in wastewater to its surface through chemical adsorption and electrostatic attraction, achieving efficient dephosphorization and ensuring that the phosphorus content of the effluent meets standards. The high-density sponge blocks provide a rich three-dimensional porous structure, which is conducive to microbial attachment and organic matter retention, enhancing the biological treatment function. The combination of these two types of filter media, as the filtration medium of the second filter tank 402, achieves both chemical dephosphorization and biological purification capabilities, thereby improving the overall treatment performance of the second filter tank 402.

[0038] like Figure 9 As shown, wastewater first enters the first filter tank 401 and flows downwards through the gaps in the filter media under gravity. The filter media surface is covered with a rich microbial community, forming a biofilm. As the wastewater flows through, organic pollutants are trapped by the biofilm and degraded into harmless or stable substances such as carbon dioxide, water, and microbial cells through microbial metabolism, achieving biological purification of the wastewater. The effluent after the first stage of treatment flows into the storage tank 7. The treated water in the storage tank is divided into two parts: one part is discharged from the system as compliant effluent; the other part is returned to the purification tank 4 and enters the second filter tank 402 for further treatment. In the second filter tank 402, the wastewater passes through media such as calcium carbonate dephosphorization filter media, effectively removing phosphorus from the water through chemical adsorption, achieving efficient dephosphorization. The dephosphorized water flows back to the storage tank 7 and mixes with the main treated flow, thereby diluting and balancing the phosphorus concentration in the effluent, ensuring that the final effluent of the system continuously meets phosphorus discharge standards. This recirculation and mixing process helps improve the stability of the dephosphorization effect and can also significantly improve the effluent quality of the system.

[0039] Furthermore, the mesh bag is made of high-strength, corrosion-resistant materials, preferably engineering plastics such as polypropylene or nylon, to ensure that it will not be damaged or deformed under long-term immersion and water flow impact. The mesh size of the mesh bag is designed to be 1mm to 10mm, preferably 3mm to 5mm, which can effectively trap the internal filter material while allowing sewage to pass through smoothly, thereby ensuring mass transfer efficiency.

[0040] To ensure that the treated water can smoothly pass through and enter the storage tank 7, a support base plate 403 is provided at the bottom of the purification tank 4 to provide stable support for the mesh bag filter unit 16. The support base plate 403 is made of high-strength, corrosion-resistant materials, such as polypropylene (PP), stainless steel, or fiberglass, to ensure that it will not be damaged by water flow impact or chemical corrosion during long-term operation. Specifically, the surface of the support base plate 403 is provided with multiple evenly distributed permeable holes 404. A water storage grid is formed between the support base plate 403 and the purification tank 4 to collect the water treated by the filter. The water storage grid is connected to the outlet of the second filter 402 through the water passage holes to collect the water treated by the filter and guide it to the storage tank 7. This water storage grid serves as an intermediate buffer zone, which can not only temporarily store the treated water but also precipitate small suspended solids, thereby further improving the quality of the effluent.

[0041] In this embodiment, the first filter 401 is mainly used for preliminary biodegradation and uniform water distribution. A water distribution pipe 17 is installed in the first filter 401, which is connected to the collection tank 1 through the first pipe 3. A cross-shaped weir flow water distributor is installed on the inner wall of the first filter 401 along the water flow direction of the purification tank 4. The water distributor has multiple evenly spaced water distribution holes, which can guide the sewage flowing into the collection tank 1 into various areas of the first filter 401, effectively avoiding local short-flow or flow deviation. The second filter 402 is mainly used for advanced treatment and reflux regulation to further remove pollutants and optimize the effluent quality. A reflux pipe 19 is installed in the second filter 402, which is connected to the storage tank 7 through the second pipe 5. It also uses a cross-shaped weir flow water distributor, but its water distribution hole spacing is smaller than that in the first filter 401, so as to ensure that the reflux water is uniformly introduced into the second filter 402 for dephosphorization treatment. One end of the return pipe 19 is connected to the storage tank 7, and the other end extends into the first filter 401, forming a mixed liquor return path. This return path allows a portion of the treated water to flow back from the storage tank 7 to the purification tank 4 for dephosphorization treatment in the second filter 402, promoting denitrification. The dephosphorized water is then returned to the storage tank 7 to mix with the mainstream water, diluting and stabilizing the phosphorus concentration in the effluent to ensure continuous compliance with discharge standards. Furthermore, to ensure control of the return flow rate and water quality adjustment, a first flow regulating valve 12 is installed on the return pipe 19. Operators can adjust the return flow rate based on water quality monitoring results to achieve optimal treatment results.

[0042] Specifically, the effluent treated by the purification tank 4 flows into the storage tank 7 through a pipe. The storage tank 7 is used to temporarily store the treated effluent and to achieve integrated management of effluent discharge, reflux regulation, and water level control. The storage tank 7 is connected to the water storage grid through a third pipe 6 to receive the effluent treated by the biological filter. The storage tank 7 is equipped with an outlet pipe 8, which penetrates the side wall of the tank and forms an outlet for discharging the treated water to an external drainage system, a greening reuse network, or a natural water body. The outlet pipe 8 is equipped with a water level regulating valve 21 and a second flow regulating valve 22. The water level regulating valve 21 is located inside the storage tank 7 and is used to sense the liquid level in the tank and automatically open and close the outlet channel to prevent the water level in the storage tank 7 from being too high or too low, thereby achieving automatic liquid level control. The second flow regulating valve 22 is located on the outlet pipe 8 outside the storage tank 7. The second flow regulating valve 22 is an electric regulating valve and is used to adjust the outlet flow according to the actual drainage needs, thereby achieving flexible operation and management.

[0043] Furthermore, a water pump 20 is installed inside the storage tank 7. The water pump 20 is connected to the second pipe 5 and the outlet pipe 8 through pipes to extract the treated water in the storage tank 7 and transport it to the purification tank 4 and the outside of the storage tank 7.

[0044] In addition, an overflow pipe 9 is provided below the outlet pipe 8. One end of the overflow pipe 9 is connected to the storage tank 7, and the other end is connected to an external drainage ditch or municipal pipe network. When the system's inflow exceeds its processing capacity or the outlet is obstructed, causing the liquid level to rise to a preset level, the excess water can be automatically discharged through the overflow pipe 9 to prevent the storage tank 7 from overflowing, thereby ensuring the safe and stable operation of the system. Preferably, the inlet height of the overflow pipe 9 is set to the maximum allowable working water level of the storage tank 7, and its pipe diameter should meet the maximum instantaneous flow rate requirements.

[0045] In this embodiment, the system also includes a control unit, which is electrically connected to electrical or electric components such as the water pump 20, flow regulating valves (e.g., the first flow regulating valve 12 and the second flow regulating valve 22), and water level regulating valve 21 in the system. This control unit is used to achieve automated operation functions such as liquid level monitoring, reflux control, and start-stop linkage. The control unit can be implemented using existing technologies such as a PLC controller, a microcontroller system, or a relay control box. Its specific circuit structure is not the focus of this invention and will not be described in detail.

[0046] Application examples: In May 2025, the aforementioned wastewater purification tank was installed at the Dongba Village Wastewater Treatment Station in Donghe District, Baotou City. After installation, it was put into operation and commissioning. The wastewater treatment system has a treatment capacity of 7 m³ / d.

[0047] After the project was completed, multiple batches of effluent from the two types of septic tanks were analyzed and tested. The wastewater treatment system using these septic tanks demonstrated excellent feasibility and reliability, with very significant wastewater treatment effects. The average ammonia nitrogen levels were: influent: 86 mg / L, effluent: 12.3 mg / L, removal rate >75%. The average COD levels were: influent: 465 mg / L, effluent: 63 mg / L, removal rate >75%. The average SS levels were: influent: 238 mg / L, effluent: 15 mg / L, removal rate >75%. The effluent pH was 7.7, meeting the design expectations.

[0048] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A wastewater purification system, characterized in that, Includes a collection tank (1) having an inlet, the collection tank (1) being filled with elastic packing material (14) to form an anaerobic bacterial bed; Purification tank (4), wherein the purification tank (4) forms at least two filter pools connected in sequence, the filter pools being connected to a collection tank via pipes; A liquid storage tank (7) having an outlet is connected to the filter tank via a pipe; The two filter pools are the first filter pool (401) and the second filter pool (402). The first filter pool (401) is provided with a water distribution pipe (17). The water distribution pipe (17) extends along the water flow direction of the purification tank (4) and is connected to the collection tank (1) to distribute the sewage evenly to the first filter pool (401). The second filter (402) is provided with a return pipe (19), at least a portion of which extends into the first filter (401) to return a portion of the treated water in the storage tank (7) to the purification tank (4).

2. The wastewater purification system according to claim 1, characterized in that, The first filter (401) and the second filter (402) are both filled with filter media. The filter media are divided into multiple mesh bags to form independent mesh bag filter media units (16). These units are used as basic modules and are filled layer by layer into the filter bed of the filter.

3. The wastewater purification system according to claim 1, characterized in that, The bottom of the purification tank (4) is provided with a support base plate (403), and its surface is provided with a plurality of evenly distributed water permeable holes (404). A water storage grid is formed between the support base plate (403) and the purification tank (4). The water storage grid is connected to the outlet of the second filter (402) through the water passage hole to collect the water treated by the filter and guide it to the storage tank (7).

4. The wastewater purification system according to claim 1, characterized in that, The water distribution pipe (17) and the return pipe (19) are both cross-shaped weir-type water distributors. The cross-shaped weir-type water distributor is connected to the inner wall of the purification tank (4) and has multiple evenly distributed water distribution holes, configured to allow the water flowing through the water distributor to be discharged through the water distribution holes.

5. A wastewater purification system according to claim 4, characterized in that, The distance between two adjacent water distribution holes on the cross-shaped weir flow water distributor installed in the second filter tank (402) is smaller than the distance between two adjacent water distribution holes on the cross-shaped weir flow water distributor installed in the first filter tank (401).

6. A wastewater purification system according to claim 1, characterized in that, The collection tank (1) is equipped with at least two sewage treatment compartments, and the adjacent sewage treatment compartments are connected by water pipes to achieve step-by-step sedimentation and anaerobic treatment of sewage.

7. A wastewater purification system according to claim 6, characterized in that, The water pipe is equipped with filter brushes, which are distributed sequentially along the direction of the water pipe.

8. A wastewater purification system according to claim 1, characterized in that, The collection tank (1) is provided with a basket grid (11) near the water inlet to intercept large solid impurities in the sewage. The basket grid (11) includes a body and a basket (1104). The basket (1104) is detachably connected to the body through a connecting structure.

9. A wastewater purification system according to claim 8, characterized in that, The connection structure includes a first buckle (1101) and a second buckle (1106). The second buckle (1106) is disposed on the basket (1104), and the first buckle (1101) is disposed on the body and surrounds the body to form a slot for receiving the second buckle (1106). The basket (1104) is connected to the body by snapping the first buckle (1101) into the slot.

10. A wastewater purification system according to claim 8, characterized in that, The basket (1104) is provided with a lifting rod (10), which extends along the axial direction of the basket (1104) and protrudes to the outside of the collection tank (1).

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