Pig farm wastewater treatment method, wastewater treatment net membrane and treatment system

Abstract

According to the pig farm wastewater treatment method, the wastewater treatment net film and the treatment system, a relatively stable layered reaction area is constructed on the basis of an artificial enhanced layering technology, and growth and reproduction environments of four types of microorganisms including chemical energy autotrophy, chemical energy heterotrophy, light energy autotrophy and light energy heterotrophy are adapted; the physical-chemical-biological synergistic removal of pollutants in different water depths is enhanced. According to the system, an anaerobic environment is established on the bottom layer of a water body to treat pollutants, an adaptive microorganism growth environment is formed in the middle layer and buffers the surface layer and the bottom layer, an environment suitable for breeding of photosynthetic microorganisms is established on the surface layer, and the concentration of suspended solids and the load of pollutants are reduced through enhanced treatment such as interception, adsorption, precipitation and biological membranes. According to the system, zero power consumption and zero medicament use can be achieved, manual operation and maintenance are not needed in principle, the layering effect is enhanced by optimizing the structure of the treatment system, various microorganisms are promoted to be stable and compatible, the pollutant degradation efficiency is remarkably improved, and efficient and synergistic removal of pollution indexes such as ammonia nitrogen, organic matter and phosphorus is achieved.

Description

Technical Field

[0001] This invention relates to a wastewater treatment method and a wastewater treatment device, particularly a wastewater treatment method for pig farms, as well as a wastewater treatment membrane and treatment system. Background Technology

[0002] To ensure the sustainable use of water resources, maintain ecological balance, and promote green economic and social development, scientific wastewater treatment and effective water environment protection have become important pathways to achieving harmonious coexistence between humans and nature. Taking livestock farm wastewater treatment as an example, the discharge volume is large and the pollutant concentration fluctuates significantly. With increasingly intensive farming practices, large quantities of wastewater rich in organic matter, nitrogen, phosphorus, and other high-concentration organic pollutants are discharged centrally, posing a severe environmental challenge to the sustainable development of animal husbandry.

[0003] Currently, the technologies widely used in pig farm wastewater treatment mainly include anaerobic digestion, sequencing batch reactors (SBRs), and advanced oxidation processes (AOPs). To improve pollutant removal efficiency, these processes typically rely on high-intensity external energy input (such as mechanical reoxygenation, forced stirring, and heating) to enhance mass transfer and biochemical reaction processes. Among them, the energy consumption of an aerobic nitrification-denitrification unit can reach as high as 9.2 kWh / m³. 3 It accounts for about 96% of the total energy consumption of the system; related studies show that its operating cost is equivalent to about US$7.13 per pig.

[0004] Patent CN120903697A discloses a wastewater treatment bioreactor and method based on an algae-bacteria symbiotic system, proposing the use of a double-layer concentric carrier surface to promote micro-ecological zoning for pig farm wastewater treatment. However, this process relies on high-energy reoxygenation, resulting in high operating costs; the complex piping and mechanical structure also increases maintenance difficulty and costs. Furthermore, the method has strict temperature control requirements, needing to operate within the range of 26℃-28℃, and has specific requirements for light exposure time; the influent also requires pretreatment through filter paper filtration. Therefore, this technology is difficult to meet the stringent cost control requirements in actual farms. Its influent pollutant concentrations and ranges are relatively low, with COD concentration at (3678.4±110.0) mg / L and TP concentration at (40.4±8.7) mg / L, indicating weak system resistance to shock loads.

[0005] Another patent, CN105110567A, proposes a wastewater deep treatment process suitable for large-scale pig farms in southern China. This process requires a series of pretreatments, such as water quality adjustment in an equalization tank and solid-liquid separation. In particular, it relies on solid-liquid separation equipment for slag removal, resulting in a complex mechanical structure and high operating costs.

[0006] The applicant also searched other relevant solutions and found that they generally suffer from problems such as high energy consumption, complex mechanical structure, and high operating costs, which result in low economic sustainability and high overall costs in the application of these technologies in large-scale farms.

[0007] Therefore, there is an urgent need in this field to provide a novel treatment system for the efficient treatment of high-load pig farm wastewater. A system that meets the following requirements will have significant social value and prospects: zero power consumption (not dependent on aeration and reoxygenation or external power), zero chemical dosing (not dependent on additional chemical agents or carbon sources), and, in principle, no manual maintenance (no need for long-term on-site personnel). Simultaneously, the system should possess good seasonal temperature adaptability, strong resistance to shock loads, and the ability to adapt to significant fluctuations in influent pollutant concentrations. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a method for treating pig farm wastewater, along with a wastewater treatment membrane and system. Based on artificially enhanced stratification, the method treats pig farm wastewater by constructing relatively stable stratified reaction zones that are adapted to the growth and reproduction environments of four types of microorganisms: chemoautotrophic, chemoheterotrophic, photoautotrophic, and photoheterotrophic. This achieves the goal of zero power consumption, zero reagent addition, and virtually no manual maintenance during the treatment process.

[0009] The wastewater treatment method for pig farms of the present invention, through Vertical carriers deployed from the water surface to the bottom for biofilm attachment and pollutant interception; horizontal carriers deployed on the water surface for biofilm attachment; and vertical suspended carriers deployed from the water surface to the middle layer for biofilm attachment and pollutant interception, forming a comprehensive system. The anaerobic environment at the bottom of a water body, the facultative anaerobic environment in the middle layer, and the aerobic and facultative anaerobic environments at the surface. The wastewater from pig farms is treated using a combination of physical, chemical, and biological methods to remove pollutants.

[0010] The wastewater treatment method for pig farms described above, wherein the combined treatment step further includes: By using vertical carriers to intercept pollutants in water bodies several times, some of them settle to the bottom of the water body, while others adhere to the vertical carriers and are decomposed and metabolized by microorganisms. By using suspended carriers to intercept pollutants suspended in the surface and middle layers of water several times, some of them settle to the bottom of the water body, while others attach to the suspended carriers and are decomposed and metabolized by microorganisms. Biological fillers for microbial attachment and cultivation are added to a horizontal carrier to promote microbial attachment and reproduction.

[0011] The wastewater treatment method for pig farms described above also includes... (1). The constructed anaerobic environment at the bottom of the water body, the facultative anaerobic environment in the middle layer of the water body, and the aerobic and facultative anaerobic environments at the surface of the water body are specifically as follows: The bottom layer of the water body is isolated from light by accumulated pollutants and blocked by horizontal carriers, forming an anaerobic environment; the middle layer of the water body is a transitional zone between the surface and the bottom layer, forming a facultative anaerobic environment, which is suitable for the growth of microorganisms in the middle layer; the surface layer of the water body constructs an attachment and reproduction environment mainly composed of photosynthetic microorganisms through horizontal carriers and biological fillers, forming and maintaining an aerobic and facultative anaerobic environment. (2). The steps also include: During seasons with high ambient temperatures, a relatively stable stratified reaction zone is constructed by using vertical mesh, horizontal mesh, and vertical suspended carriers to prevent pollutants accumulated at the bottom of the water body from rising to the surface beyond the limit.

[0012] The wastewater treatment method for pig farms described above also includes the following steps: (1) The surface water that has undergone composite treatment is treated by interception, adsorption and sedimentation. During the interception, adsorption and sedimentation process, pollutants accumulate at the bottom of the water body and form an anaerobic environment. The interception, adsorption, and precipitation processes are as follows: In areas with a cross-sectional area less than 2m²... 2 In the channel, the surface water is allowed to flow, and the water passes through the structure formed by the biofilm carrier and biological filler several times, causing pollutants to settle at the bottom of the water body. The specific interception, adsorption, and precipitation processes are handled according to the following model: in: Q represents the wastewater treatment capacity, in meters (m³). 3 / d; L represents the channel length, in meters (m). N is the filtration interval distance of the biological filter media, in meters, and must satisfy 2 ≥ N ≥ 0.5; K is the mass of biological filler material added per meter of channel, in kg, and must satisfy 10≤K≤30; C is a proportionality constant, in meters. 3 / (d·kg) is determined by factors including actual treatment efficiency and wastewater quality, and is determined through experimental data. (2) A reinforced horizontal carrier is laid on the surface of the water body, and biological filler is added to construct an attachment and reproduction environment dominated by photosynthetic microorganisms, thereby forming and maintaining an aerobic and facultative anaerobic environment. (3) For surface water that has undergone interception, adsorption and sedimentation treatment, light and reoxygenation are carried out. Specifically, the water body is lighted and reoxygenated through shallow surface flow.

[0013] The wastewater treatment membrane of the present invention comprises: (1) Horizontal mesh, located in the surface layer of the water; The horizontal mesh is a porous mesh fabric used for water infiltration and biofilm attachment. The horizontal mesh carries biological fillers for microbial attachment and cultivation, promoting the attachment and reproduction of microorganisms and creating an aerobic and facultative anaerobic environment on the surface of the water. The horizontal membrane has vertically downward-facing skirts around its perimeter. These skirts are made of porous mesh fabric, which forms a biofilm carrier and intercepts horizontally moving pollutants, causing them to settle. (2) Vertical mesh, which is set between the water surface and the bottom, perpendicular to the direction of water flow; the vertical mesh is a porous mesh fabric used to attach biofilm and intercept horizontally moving pollutants to settle them.

[0014] The wastewater treatment membrane described above includes: The horizontal mesh is located in the surface layer of the water, within 20cm of the water surface. The horizontal mesh has buoyancy blocks around its perimeter. Both the horizontal mesh and the skirt are fixed to the buoyancy blocks. The area of ​​the horizontal mesh is larger than the frame formed by the buoyancy blocks and it sinks below the water surface. The skirt height is 40% to 60% of the average water depth; The vertical mesh has buoyancy blocks at its upper edge, and the height of the vertical mesh is greater than the maximum water depth.

[0015] An enhanced treatment tank according to the present invention is used for treating wastewater, including tanks with a cross-sectional area of ​​less than 2m². 2 Enhanced treatment channel, light-irradiated reoxygenation channel; The enhanced treatment channel contains several interception nets that allow water to permeate, and a surface mesh is set between two interception nets. Biological packing materials are placed inside the interception nets and on the surface mesh. This is used to create an anaerobic environment at the bottom of the water body and an aerobic and facultative anaerobic environment in the surface layer of the water body. Downstream of the enhanced treatment canal is a shallow water, light-irradiated reoxygenation canal.

[0016] An enhancement pool as described above, wherein The enhanced treatment channel is composed of several channel sections arranged side by side, connecting the surface of the upstream enhanced treatment channel with the bottom of the next enhanced treatment channel, so that the water body repeatedly settles and the surface water body enters the downstream; the surface mesh is set in the water body surface layer within 20cm of the water surface. The light-irrigated reoxygenation channel has a water depth of less than 30cm and a width of more than 50cm. Several grooves perpendicular to the water flow direction are set at the bottom, and biological filler is placed in the grooves. The outlet of the light-irrigated reoxygenation channel is a wide opening with a width of more than 300cm to form a shallow flow. Among them, when the cross-sectional area of ​​the enhanced treatment channel is 1m 2 When this is the case, the enhanced treatment channel should be set according to the following parameters: , in: Q represents the wastewater treatment capacity, in meters (m³). 3 / d; L represents the length of the enhanced treatment channel, in meters (m). N is the spacing between the interception nets, in meters, and must satisfy 2 ≥ N ≥ 0.5; K represents the mass of biological filler material added per meter of the enhanced treatment channel, in kg, and must satisfy 10≤K≤30; C is a proportionality constant, in meters. 3 / (d·kg) is determined by factors including actual treatment efficiency and wastewater quality, and is determined through experimental data. The length of the light-induced reoxygenation channel is 30% to 50% of that of the enhanced treatment channel, and the ratio of the horizontal projected area of ​​the enhanced treatment channel to that of the light-induced reoxygenation channel is 4 to 6:1.

[0017] The wastewater treatment system of the present invention is used to implement the method described above, comprising: At least one treatment tank for combined wastewater treatment. The treatment tank is equipped with the wastewater treatment membrane as described above, wherein the vertical membrane serves as the vertical carrier, the horizontal membrane serves as the horizontal carrier, and the skirt serves as the suspended carrier, so that the treatment tank can construct an anaerobic environment at the bottom of the water body, a facultative anaerobic environment in the middle layer of the water body, and an aerobic and facultative anaerobic environment at the surface of the water body. The inlet of the treatment tank is connected to the wastewater outlet of the pig farm; the outlet of the treatment tank is surface water.

[0018] The wastewater treatment system described above includes at least two treatment tanks, namely a first tank and a second tank, and at least one enhancement tank as described above is provided between the first tank and the second tank. The interception net has the function of intercepting, adsorbing and settling pollutants, the surface mesh serves as a reinforced horizontal carrier, and the light-irradiated reoxygenation channel is used for light and reoxygenation. The inlet of the first pool is connected to the wastewater outlet of the pig farm; the outlet of the first pool is surface water and is connected to the inlet of the enhanced pool; the outlet of the light-induced reoxygenation channel is connected to the inlet of the second pool; the outlet of the second pool is surface water.

[0019] The wastewater treatment system described above, wherein The treatment pool is equipped with several vertical mesh membranes, which intercept the water flow. The two ends of the vertical mesh membranes are connected to the pool bank by ropes to fix their positions in the treatment pool. Several horizontal mesh membranes are set between the vertical mesh membranes. The horizontal mesh membranes are connected in series by ropes to form a row, which is perpendicular to the water flow direction. The ropes are connected to the pool bank to fix their positions in the first pool. Each horizontal mesh membrane has a skirt at the bottom. The horizontal mesh is spaced 10cm to 30cm apart, and the horizontal mesh is spaced 10cm to 100cm apart in each row; the vertical mesh is spaced 10cm to 50cm apart from the horizontal mesh, so that the surface layer of the water body has horizontal mesh. In the first pool, 2 to 3 rows of horizontal mesh are set between every two vertical meshes; in the second pool, 3 to 5 rows of horizontal mesh are set between every two vertical meshes.

[0020] Beneficial technical effects: The wastewater treatment process for pig farms proposed in this invention, combined with a matching membrane structure and an enhanced tank system, forms a wastewater treatment system that can efficiently treat high-load pig farm wastewater without relying on aeration and reoxygenation or external power input, thus achieving zero power consumption operation. This invention also has the advantages of zero operation and maintenance costs, strong resistance to shock loads, and the ability to adapt to significant fluctuations in influent pollutant concentration.

[0021] (1) Zero power consumption: In particular, it does not require energy-consuming equipment such as mechanical reoxygenation and water pump lifting, and can operate stably under zero power consumption conditions; (2) Zero reagent addition: No reagents are required during the operation of this invention; (3) In principle, no manual operation and maintenance is required: no pretreatment of pig farm wastewater is required, and no solid-liquid separation is required; (4) Strong resistance to shock loads: During a test run, the influent COD concentration ranged from 3913 mg / L to 88081 mg / L, SS concentration ranged from 5120 mg / L to 93300 mg / L, NH3-N concentration ranged from 1032.97 mg / L to 4065.95 mg / L, and TP concentration ranged from 110.40 mg / L to 2920.00 mg / L. Even under significant fluctuations in influent pollutant concentrations, the system maintained stable treatment performance.

[0022] (5) Wide temperature adaptability: The test area has obvious seasonal temperature changes. When the ambient temperature is between 1℃ and 41℃ and the surface temperature of the water body varies from 9℃ to 38℃, the system still maintains stable operation.

[0023] (6) Good decontamination effect: It exhibits stable and excellent removal performance of the main pollutants in pig farm wastewater, which fully demonstrates its strong ability to reduce organic pollution load. According to the analysis results of an experimental operation data, the removal rate of the system after multi-stage treatment (treatment tank-treatment tank-treatment tank-enhanced tank-treatment tank) is as follows: Chemical oxygen demand (COD) is 95.45-99.85%; suspended solids (SS) is 97.46-99.98%; ammonia nitrogen (NH3-N) is 94.13-99.96%; total phosphorus (TP) is 94.86-99.88%.

[0024] (7) Simple structure: No dense pipeline layout or complex mechanical structure, extremely low construction cost and minimal maintenance requirements. Through spatially oriented degradation of pollutants, efficient synergistic removal of ammonia nitrogen, organic matter and phosphorus is achieved.

[0025] In summary, this technology, relying on a self-sustaining stratification mechanism, achieves efficient removal of pollutants from pig farm wastewater, constructs a wastewater treatment configuration that is structurally stable, self-regulating in operation, and possesses long-term stability, and provides an efficient and sustainable engineering solution for pig farm wastewater treatment. Attached Figure Description

[0026] Figure 1 Distribution of pollutant concentrations in different treatment ponds Figure 2 This is a diagram of the enhanced hierarchical system structure for this example; Figure 3 This is a structural diagram of the first pool, mainly showing examples of the distribution of horizontal and vertical meshes within the first pool; Figure 4 This is a picture of the actual contents of the first pool; Figure 5 The diagram shows the structure of the enhanced treatment channel and the light-induced reoxygenation channel. Figure 6 To enhance the image of the actual pool.

[0027] Surface layer 1, middle layer 2, bottom layer 3, water surface 4; aerobic zone 5; vertical mesh 6; skirt 7; foam 8; treatment tank 9; inlet 10; outlet 11; enhancement tank 12; horizontal mesh 13; enhancement treatment channel 14; interception net 15; surface mesh 16; light-irradiated reoxygenation channel 17; wide opening 18. Detailed Implementation

[0028] Example 1: This example provides a wastewater treatment system for treating pig farm wastewater by enhancing the stratification of water bodies.

[0029] The wastewater treatment system mainly includes: treatment tank 9 and enhancement tank 12. Each tank has an inlet 10 and an outlet 11; and a treatment unit between the inlet and outlet.

[0030] The inlet area of ​​treatment tank 9 is connected to the wastewater outlet of the pig farm, and the pig farm wastewater is discharged into the inlet area of ​​the treatment tank. Treatment tank 9 is divided into an inlet area (the area where inlet 10 is located), a treatment area, and an outlet area (the area where the outlet is located). The treatment tank has a vertical mesh membrane, and the two ends of the vertical mesh membrane are anchored to the tank bank by ropes. Horizontal mesh membrane rows (horizontal mesh membranes are connected in series by ropes to form rows) are set between the vertical mesh membranes and anchored to the tank bank by ropes. The final laid horizontal mesh membrane will occupy 50% to 80% of the area of ​​the treatment tank. The wastewater treatment mesh membrane forms a bottom layer for collecting pollutants, a middle layer for transition and as a facultative anaerobic biological treatment environment, and several aerobic and facultative anaerobic zones for microbial attachment and growth in some surface areas of the water. During the operation of the treatment tank constructed by the above system, no electricity consumption, no chemical reagent addition, and in principle, no manual maintenance are required.

[0031] Example 2: In the treatment tank, horizontal meshes of varying rectangular sizes, with different spacing between rows of these meshes (e.g., 100cm, 80cm, 50cm, or 10cm), and between the meshes themselves (e.g., 12cm, 20cm, or 25cm), ultimately create different skirt suspension densities, vertical mesh interception densities, and the proportion of horizontal mesh area in the tank. Higher density skirts and vertical meshes reduce water flow velocity and increase manufacturing costs, but enhance interception effectiveness and biofilm density. The aforementioned spacing data considers a balance between construction costs, water flow smoothness, and interception effectiveness.

[0032] refer to Figure 2-4 The vertical mesh membrane is positioned within the water body, between the water surface and the bottom. Water flows from the inlet to the outlet in the pool. The vertical mesh membrane is perpendicular to the water flow direction, with both ends adhering to the pool walls, completely intercepting the water within the treatment pool. The two ends are connected to the left and right banks of the treatment pool via ropes, which are kept taut, essentially fixing the membrane's horizontal position within the pool. (Reference) Figure 2-3 The vertical mesh has buoyancy blocks at its upper edge. These blocks can be made of foam or sealed plastic bottles, ensuring they float on the water surface for extended periods. A porous mesh fabric is attached below the buoyancy blocks. Each buoyancy block is a hollow foam core (8) with a diameter exceeding 10cm. A 6-point PVC pipe is threaded through the hollow holes of the foam core, with a foam core fixed approximately every 70cm along the pipe. The upper edge of the vertical mesh is then connected to the PVC pipe, while the lower edge hangs naturally. A rope is threaded through the PVC pipe. If the pool width is 15 meters, the vertical mesh should be longer than 15 meters, continuous and uninterrupted.

[0033] When a vertical mesh membrane is attached to a biofilm, it naturally sags under gravity and its lower edge curls up or rises due to changes in water level. For example, during the rainy season when water overflows and during the dry season when water levels are low, the height of the porous mesh fabric must be greater than the maximum water depth of the treatment tank to prevent the vertical mesh membrane from losing its interception function. One example is a vertical mesh membrane made of porous mesh fabric woven from glass fiber, which has good corrosion resistance and mechanical strength, and its surface has a large number of pores with a diameter of 2mm to 4mm.

[0034] Vertical membranes in the pool act as interceptors of pollutants, causing them to be retained by the membranes while the water continues to flow downstream. Multiple vertical membranes distributed throughout the pool intercept pollutants layer by layer. The vertical membranes, situated within the water, form a biofilm, significantly reducing pollutant removal. Due to the large accumulation of pollutants in the bottom area of ​​the treatment pool, and the absence of oxygen supply and light, an anaerobic environment is created at the bottom, where pollutants undergo anaerobic treatment.

[0035] The horizontal mesh 13 is used to form aerobic and facultative anaerobic zones on the surface of the treatment tank. The horizontal mesh 13 is suspended in the wastewater and within 20cm of the water surface.

[0036] refer to Figure 2-3The horizontal mesh 13 is a rectangular porous mesh fabric with a length and width of 100-200cm (e.g., a square with a side length of 100cm, 120cm, 150cm, or 200cm). A skirt 7 is vertically installed downwards around the perimeter of the porous mesh fabric, drooping under gravity. The height of the skirt 7 is 40%-60% of the average water depth. Buoyancy blocks surround the horizontal mesh, and both the horizontal mesh 13 and the skirt 7 are fixed to these blocks. The construction method is similar to that of the vertical mesh edge, using PVC pipes to build a rectangular frame, with multiple hollow foam inserts on the PVC pipes, and the skirt 7 fixed to the PVC pipes. The area of ​​the horizontal mesh 13 is larger than the frame formed by the buoyancy blocks, causing the horizontal mesh to sink below the water surface under the gravity of the biological packing material, forming an aerobic zone above the horizontal mesh. A preferred example is that the horizontal mesh and the skirt are made from a single piece of porous mesh fabric. The horizontal mesh is fixed to a rectangular frame at all four sides, while the center hangs down naturally, forming a downward-facing spherical depression. The deepest point of the depression is 20 cm below the water surface, while the area near the frame is above the water surface. The remaining areas transition from the deepest point to the surface, creating rich microbial growth environments at different depths of 15 cm, 10 cm, and 5 cm. The porous mesh fabric extending beyond the rectangular frame around the horizontal mesh naturally hangs down to form the skirt. The skirt is densely distributed throughout the water, constituting a biofilm carrier suspended in the surface and middle layers of the water, and working in conjunction with the vertical mesh to block horizontally moving suspended matter. The porous mesh fabric is woven from glass fiber, possessing good corrosion resistance and mechanical strength, with numerous pores on its surface with a diameter of 2 mm to 4 mm. (Reference) Figure 3-4 Multiple horizontal meshes 13 are arranged together and strung together with ropes to form rows. The rows are set perpendicular to the direction of water flow, and the ropes are connected to the pool bank to fix their position in the pool.

[0037] Through various engineered structures (vertical mesh, horizontal mesh, and skirt), a relatively stable stratified reaction zone is constructed, adaptable to the growth and reproduction environments of four types of microorganisms: chemoautotrophic, chemoheterotrophic, photoautotrophic, and photoheterotrophic. The area above the horizontal mesh, submerged to a depth of no more than 20 cm, is a region where sunlight can penetrate. This area provides ample sunlight and oxygen, offering both aerobic and facultative anaerobic zones that provide the necessary nutrients and environment for microbial growth, promoting attachment, growth, and reproduction. The biological filler, containing nutrients such as calcium, magnesium, and silicon (e.g., a mixture of 50%–80% ordinary silicate cement, 10%–40% calcium-based bentonite, and 10% commercially available aerobic bacterial agent from Henan Kunhuo Biotechnology Co., Ltd.), further promotes microbial attachment and growth. The vertical mesh, horizontal mesh, and skirt construct a relatively stable stratified reaction zone, preventing pollutants accumulated at the bottom of the water from exceeding their limits and rising to the surface.

[0038] The surface layer receives ample sunlight and air, forming aerobic and facultative anaerobic zones. The middle and bottom layers accumulate pollutants and are isolated from sunlight by the horizontal mesh, creating facultative and anaerobic zones. In this example, the engineered structures, combined with solar radiation, geothermal input, and natural temperature gradients, enhance the water stratification effect, resulting in a mixed-layer structure of aerobic, facultative, and anaerobic environments in the surface, middle, and bottom layers.

[0039] Example 3: refer to Figure 5-6 The enhanced pool 12 includes an enhanced treatment channel 14 and a light-induced reoxygenation channel 17. The enhanced treatment channel 14 has a physical, chemical, and biological action system.

[0040] To conserve land, the enhanced treatment channel 14 is constructed by dividing the land into parallel sections, with adjacent sections sharing the same channel wall. The surface layer of the upstream section of the enhanced treatment channel 14 is connected to the bottom layer of the next section, creating a backflow of water. This allows surface water from the upstream section to flow into the bottom layer of the next section, resulting in repeated sedimentation and allowing the surface water to flow downstream, further enhancing the sedimentation of pollutants and trapping them within the current section of the enhanced treatment channel. Therefore, a PVC bend with a diameter exceeding 20cm is used to connect the upstream section to the next section of the enhanced treatment channel.

[0041] In one example, an enhanced treatment channel (14) was constructed on a 20-meter-long and 6-meter-wide soil block. The enhanced treatment channel consisted of five parallel sections, each 19.5 meters long (25cm wide at each end), 100cm wide, and 100cm deep, with a 15cm thick wall between sections, effectively utilizing space and achieving a total channel length of 97.5 meters. Downstream of the enhanced treatment channel 14 was a photo-oxidation channel 17, also parallel to the enhanced treatment channel 14. This channel consisted of two sections, each 17 meters long, totaling 34 meters, 80cm wide, and 20cm deep, sharing some of the channel wall with the enhanced treatment channel to save space. At 1.5m-2m intervals at the bottom of the photo-oxidation channel, a groove was created, 20cm wide and 10cm deep, perpendicular to the water flow direction, and filled with biological filler. The biological filler is a biological filler containing nutrients such as calcium, magnesium, and silicon (for example, a mixture consisting of 50% to 80% ordinary silicate cement, 10% to 40% calcium-based bentonite, and 10% commercially available mixed aerobic bacteria agent purchased from Henan Kunhuo Biotechnology Co., Ltd.).

[0042] The outlet of the light-induced reoxygenation channel is a wide opening exceeding 5 meters, creating a waterfall-like shallow flow. The channel's length, shallowness, and relatively fast flow velocity allow for greater contact between the water and air, ensuring sunlight reaches the bottom and achieving the desired reoxygenation effect.

[0043] In the enhanced treatment channel 14, an interception net 15 is installed every 1m to 1.5m. The interception net 15 densely divides the water body, allowing suspended solids to settle further. The area of ​​the interception net 15 is approximately the same as the cross-sectional area of ​​the enhanced treatment channel 14. It is installed in the enhanced treatment channel to intercept water while allowing it to permeate through. Biological filler is placed on the interception net 15. The biological filler includes nutrients such as calcium, magnesium, and silicon (for example, a mixture consisting of 50%–80% ordinary silicate cement, 10%–40% calcium-based bentonite, and 10% commercially available aerobic bacteria agent purchased from Henan Kunhuo Biotechnology Co., Ltd.). For example, several bags are sewn together and distributed on the interception net, with the bags filled with biological filler, forming a physical, chemical, and biological action system. To save land use, the enhanced treatment channel 14 is divided into sections arranged side by side on a piece of land, with adjacent sections sharing the same channel wall. The interception net consists of a rectangular frame and a mesh fixed within the frame. The frame is fixed to pre-embedded parts on both sides of the enhanced treatment channel via hooks. A surface mesh 16 is installed between every two interception nets. The surface mesh 16 is horizontally positioned approximately 20cm below the water surface, with a width of 1m and a length of 1m to 1.5m. The surface mesh 16 also consists of a rectangular frame and a mesh fixed within it. The frame is fixed to pre-embedded parts on both sides of the enhanced treatment channel via hooks. Biological filler is spread on the surface mesh 16. The biological filler includes nutrients such as calcium, magnesium, and silicon (e.g., a mixture consisting of 50%–80% ordinary silicate cement, 10%–40% calcium-based bentonite, and 10% commercially available aerobic bacteria agent purchased from Henan Kunhuo Biotechnology Co., Ltd.). The specific working principle of the surface mesh is similar to that of the horizontal mesh: it provides a microbial attachment and growth environment in the area from 4 to 20cm below the water surface, forming an aerobic and facultative anaerobic zone. The intercepting net 15, the surface mesh 16, and the bag are all woven from fiberglass, with numerous pores ranging from 2mm to 4mm in diameter distributed on the surface. The frame is made of corrosion-resistant 6-point PVC pipe.

[0044] The design of the enhanced treatment channel 14 should be based on the wastewater treatment volume. Different wastewater treatment volumes require different channel numbering, length, and interceptor mesh density. When designing the entire wastewater treatment system, hydraulic retention time, pollutant load, environmental conditions, and land area must be comprehensively considered for rational allocation and planning. To ensure the efficient and stable operation of the enhanced treatment channel, the following enhanced treatment channel design data model is provided. This model uses the daily wastewater treatment volume as a benchmark, combined with a flow velocity of 2.5 m / h (lower flow velocities can increase the contact time between the water flow and the packing material, as well as the sedimentation effect), to calculate the required total length of the enhanced treatment channel, the spacing and number of interceptor meshes, and the mass of biological packing material to be added.

[0045] Assume the cross-sectional area of ​​the enhanced treatment channel is 1m². 2 : , in: Q represents the wastewater treatment capacity, in meters (m³). 3 / d; L represents the length of the enhanced treatment channel, in meters (m). N is the spacing between the interception nets, in meters, and must satisfy 2 ≥ N ≥ 0.5; K represents the mass of biological filler material added per meter of the enhanced treatment channel, in kg, and must satisfy 10≤K≤30; C is a proportionality constant, in meters. 3 / (d·kg) is determined by factors such as actual treatment efficiency and wastewater quality, and can be determined through experimental data; Among them, the length of the light-irradiated reoxygenation channel 17 is 30% to 50% of that of the enhanced treatment channel, the depth is less than 30cm, and the ratio of the horizontal projected area of ​​the enhanced treatment channel to that of the light-irradiated reoxygenation channel is 4 to 6:1.

[0046] For example, when the emissions from a pig farm are 60m³ per day 3 At that time, the wastewater enhanced treatment channel system should be designed as follows: Based on the given model (fixed cross-sectional area 1m) 2 (Flow rate 2.5 m / h), with a daily processing capacity Q = 60 m³ / h. 3 Using / d as the core input, and combining model constraints and engineering design logic, the design of all parameters for the enhanced treatment channel, the light-induced reoxygenation channel, the interception net, and the placement of biological fillers is completed, as detailed below: Hourly processing flow rate: q = Q / 24 = 60 / 24 = 2.5m 3 / h (matched with flow rate and cross-sectional area, verified as qualified).

[0047] 1. Enhanced treatment channel length L: At low flow velocities, sufficient hydraulic retention time T is required to improve the contact and sedimentation effect of the packing material. Based on wastewater treatment engineering experience (the retention time in enhanced treatment channels for domestic wastewater / general industrial wastewater is typically 30–48 hours), a target retention time of T=38 hours is selected. Using the formula L=QT / 24, the following calculation is performed: L = 60 * 38 / 24 = 95m (If the stay time needs to be adjusted, it can be flexibly converted according to the formula: for example, if T = 40h, then L = 100m, and if T = 36h, then L = 90m).

[0048] 2. Interception net parameters 15 (spacing N + quantity M) Spacing selection: Model constraint 2m≥N≥0.5m, select N=1.5m.

[0049] Quantity calculation: According to the principle of "no netting at the beginning and end, and equidistant arrangement in the middle", the formula is M=⌊L / N⌋-1 (integer), M=63-1=62.

[0050] 3. Parameters for adding biological packing material (K + total mass of biological packing material G) Mass of biological packing material per meter K: Model constraint 10kg≤K≤30kg, take K=20kg.

[0051] Total mass of biological filler material added to the canal (static filling) G: G=K×L / N=20×95 / 1.5=1267kg (If K is 10kg, then G=633kg; if K is 30kg, then G=1900kg).

[0052] Example 4: This example demonstrates a method for treating wastewater from a pig farm: Step 1: During the system startup phase, the treatment tank was inoculated with a complex microbial community, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae).

[0053] Step 2: Untreated pig farm wastewater (containing pig manure, urine, and flushing wastewater) is directly introduced into the treatment tank. The wastewater has not undergone pretreatment or solid-liquid separation.

[0054] Step 3: In the treatment tank, the vertical mesh, horizontal mesh, and skirt create aerobic, facultative, and anaerobic environments in the surface, middle, and bottom layers of the water.

[0055] Step 4: Discharge the treated surface wastewater from the treatment tank.

[0056] The above system requires no electricity consumption, no chemical additives, and in principle, no manual maintenance during operation.

[0057] Example 5: This example demonstrates a method for treating wastewater from a pig farm: Step 1: During the system startup phase, the treatment tank was inoculated with a complex microbial community, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae).

[0058] Step 2: Directly introduce pig farm wastewater, which contains pig manure, urine, and flushing wastewater, into the treatment tank. The wastewater has already undergone pretreatment and solid-liquid separation.

[0059] Step 3: In the treatment tank, the vertical mesh, horizontal mesh, and skirt create aerobic, facultative, and anaerobic environments in the surface, middle, and bottom layers of the water.

[0060] Step 4: Discharge the treated surface wastewater from the treatment tank.

[0061] The above system requires no electricity consumption, no chemical additives, and in principle, no manual maintenance during operation.

[0062] Example 6: This example demonstrates a method for treating wastewater from a pig farm. The wastewater is treated by sequentially flowing through various treatment units; this is achieved through the following steps: Step 1: During the system startup phase, the treatment tank was inoculated with a complex microbial community, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae).

[0063] Step 2: Directly introduce wastewater from the pig farm, which includes pig manure, urine, and flushing wastewater, into the treatment tank.

[0064] Step 3: In the treatment tank, the vertical mesh, horizontal mesh, and skirt create aerobic, facultative, and anaerobic environments in the surface, middle, and bottom layers of the water.

[0065] Step 4: Discharge the treated surface wastewater from the second pool for enhanced treatment.

[0066] Step 5 of the enhanced tank: The treated wastewater is discharged from the outlet of the light-irradiated reoxygenation channel through shallow flow.

[0067] The above system requires no electricity consumption, no chemical additives, and in principle, no manual maintenance during operation.

[0068] Example 7: This example demonstrates a method for treating wastewater from a pig farm. The wastewater is treated by sequentially flowing through various treatment units; this is achieved through the following steps: Step 1: During the system startup phase, each first pool was inoculated with a complex microbial community, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae).

[0069] Step 2: Directly introduce wastewater from the pig farm, which includes pig manure, urine, and flushing wastewater, into the first pool.

[0070] Step 3: In the treatment tank, the vertical mesh, horizontal mesh, and skirt create aerobic, facultative, and anaerobic environments in the surface, middle, and bottom layers of the water.

[0071] Step 4: The surface wastewater treated in the first pool enters the enhancement pool for enhanced treatment to reduce the concentration of suspended solids and organic load.

[0072] Step 5 in the enhanced aeration tank: Wastewater discharged from the outlet of the light-irradiated reoxygenation channel is input into the second tank. This step is similar to step 1, except that the pollution concentration in the water is significantly reduced after entering the second tank. Therefore, the density of the vertical and horizontal membranes and the skirting in the second tank is reduced.

[0073] Step 6: Discharge the treated surface wastewater from the second pool.

[0074] The above system requires no electricity consumption, no chemical additives, and in principle, no manual maintenance during operation.

[0075] Example 8: This example demonstrates a method and system for treating wastewater from a large-scale pig farm (with approximately 5,000 fattening pigs) in Guangyuan City, Sichuan Province.

[0076] The wastewater treatment system mainly consists of a treatment tank. Upon system startup, the treatment tank is inoculated with a complex microbial community, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae). The treatment tank has an inlet 10 and an outlet 11; outlet 11 is an overflow outlet, allowing surface water from the treatment tank to be discharged.

[0077] The inlet area of ​​treatment tank 9 is connected to the wastewater outlet of the pig farm. After solid-liquid separation, the wastewater from the pig farm is discharged into the inlet area of ​​the treatment tank.

[0078] Treatment tank 9 is divided into an inlet area (the area where inlet 10 is located), a treatment area, and an outlet area (the area where the outlet is located). The treatment tank is 50m long (length from the inlet end to the outlet end) and 30m wide, with a total area of ​​approximately 1500m². 2 In the treatment tank, a first vertical mesh is installed 1m from the inlet. Subsequently, a vertical mesh is installed every two rows of horizontal mesh. The vertical meshes are anchored to the tank bank via ropes at both ends. The horizontal meshes are strung together to form rows, with approximately 14cm intervals within a row and approximately 20cm intervals between rows. These are also anchored to the tank bank via ropes, with approximately 10cm intervals between rows of vertical and horizontal meshes. The final number of horizontal meshes installed will be approximately 290, covering 75%–80% of the treatment tank area (smaller horizontal meshes will be used to fill any large gaps). There will be 8–10 vertical meshes (an additional vertical mesh can be installed at the inlet and outlet).

[0079] Water samples were collected in winter (December to February of the following year), spring (March to May), and summer (June to August), including water samples from pig farm wastewater after solid-liquid separation and effluent treated by the treatment pond of this method.

[0080] in: According to the water quality test results of "Determination of Chemical Oxygen Demand in Water - Dichromate Method" (HJ828-2017), the COD influent concentration fluctuated between 3913 mg / L and 69200 mg / L, while the effluent concentration remained stable in the range of 3532 mg / L to 7425 mg / L. According to the water quality test results in GB11901-89 "Determination of Suspended Solids in Water by Gravimetric Method", the influent SS concentration ranged from 2875 mg / L to 104200 mg / L, and the effluent concentration remained between 1115 mg / L and 4005 mg / L. According to the water quality test results of "Determination of Ammonia Nitrogen in Water by Nessler's Reagent Spectrophotometric Method" (HJ535-2009), the influent NH3-N concentration ranged from 757.30 mg / L to 2292.97 mg / L, and the effluent concentration ranged from 752.97 mg / L to 1421.89 mg / L. According to the water quality test results in GB 11893-89 "Determination of Total Phosphorus in Water - Ammonium Molybdate Spectrophotometric Method", the influent TP concentration ranged from 177.50 mg / L to 2468.00 mg / L, while the effluent concentration remained between 45.60 mg / L and 134.60 mg / L.

[0081] It operates across multiple seasons, with an outdoor temperature range of -2℃ to 39℃ and a treatment tank water temperature range of 6.0℃ to 33.0℃.

[0082] Water quality testing and data analysis results show that the treatment pond exhibits high comprehensive removal efficiency for multiple pollutant indicators, with removal rates ranging as follows: COD 48.47-86.60%; SS 50.61-98.46%; NH3-N 37.83-52.72%; and total phosphorus (TP) 50.35-96.66%.

[0083] The above system requires no electricity consumption, no chemical additives, and in principle, no manual maintenance during operation.

[0084] Example 9: This example demonstrates a wastewater treatment method and system applied to a large-scale pig farm (with approximately 5,000 fattening pigs) in Guang'an City, Sichuan Province, China.

[0085] The wastewater treatment system consists of four main treatment tanks and one enhancement tank.

[0086] In this example, the three pools upstream of the enhancement pool are referred to as the first pool, and the pool downstream of the enhancement pool 12 is referred to as the second pool. That is, the pool for treating high suspended solids and high-concentration wastewater is defined as the first pool, while the pool for treating low-concentration wastewater with significantly lower suspended solids and pollutant concentrations than the first pool is referred to as the second pool.

[0087] The first pool is connected to the pig farm's wastewater outlet. The connections between each pool (including the enhancement pool) are all to connect the upstream surface layer to the downstream, and finally the treated surface wastewater is discharged from the second pool.

[0088] Each of the three first pools 9 has an inlet area (the area where the inlet 10 is located), a treatment area, and an outlet area (the area where the outlet is located). The total area of ​​the three first pools is approximately 6500 m². 2 The first vertical mesh is installed, followed by one vertical mesh every two rows of horizontal mesh. The vertical meshes are anchored to the pool bank at both ends via ropes. The horizontal meshes are strung together to form rows, with approximately 20cm intervals within a row and approximately 30cm intervals between rows. The vertical meshes are spaced approximately 20cm apart from the rows of horizontal meshes. Ultimately, the first pool will have approximately 1200 horizontal meshes, covering about 70% of the pool area; and approximately 35-40 vertical meshes (an additional vertical mesh can be installed at the inlet and outlet).

[0089] An enhancement tank 12 is set between the first tank and the second tank. The outlet 11 of the first tank 9 is an overflow outlet, which is connected to the inlet of the enhancement treatment channel, so that the surface water of the first tank enters the enhancement tank; the outlet of the light-irradiated reoxygenation channel serves as the outlet of the enhancement tank and is connected to the inlet of the second tank.

[0090] The enhanced treatment channel is 100m long and divided into 5 sections, each 20m long. The channel is 1m deep and 1m wide, with an interception net installed every 1m. A surface mesh is installed in the water surface layer between two interception nets, and biological filler is spread on the surface mesh. The light-irradiated reoxygenation channel is 37m long.

[0091] The second pool is 65 meters long and 31 meters wide, with an area of ​​approximately 2000 square meters. 2 The inlet of the second pool is connected to the outlet of the enhanced pool. The vertical mesh membranes in the pool are anchored to the pool bank at both ends via ropes. Three rows of horizontal mesh membranes (connected by ropes) are installed between the vertical mesh membranes, with approximately 30cm intervals between the horizontal mesh membranes within a row and approximately 100cm intervals between rows. These are anchored to the pool bank via ropes, with approximately 50cm intervals between the vertical and horizontal mesh membrane rows. Ultimately, the second pool will have approximately 270 horizontal mesh membranes, occupying about 50% of the treatment pool area; and 7-9 vertical mesh membranes (one more can be installed at the inlet and outlet). The outlet of the second pool is an overflow outlet.

[0092] Each treatment tank was inoculated with a complex microbial community at system startup, including nitrifying-denitrifying bacteria and photosynthetic microalgae (Trebouxiophyceae and Chlorophyceae).

[0093] The first pool is connected to the pig farm's wastewater outlet, and untreated pig farm wastewater, containing pig manure, urine, and flushing wastewater, is directly fed into it. The wastewater has not undergone pretreatment or solid-liquid separation.

[0094] During the study period, water samples were collected in winter (December to February of the following year), spring (March to May), and summer (June to August), including wastewater discharged from pig farms and effluent treated by this method.

[0095] During the runtime, see Figure 1 ,in: According to the water quality test results of "Determination of Chemical Oxygen Demand in Water - Dichromate Method" (HJ828-2017), the COD influent concentration fluctuated between 7256 mg / L and 88081 mg / L, while the effluent concentration remained stable in the range of 135 mg / L to 330 mg / L. According to the water quality test results in GB11901-89 "Determination of Suspended Solids in Water by Gravimetric Method", the influent SS concentration ranged from 5120 mg / L to 93300 mg / L, and the effluent concentration remained between 22 mg / L and 130 mg / L. According to the water quality test results of "Determination of Ammonia Nitrogen in Water by Nessler's Reagent Spectrophotometric Method" (HJ535-2009), the influent concentration of NH3-N ranged from 1032.97 mg / L to 4065.95 mg / L, and the effluent concentration ranged from 19 mg / L to 61 mg / L. According to the water quality test results in GB 11893-89 "Determination of Total Phosphorus in Water - Ammonium Molybdate Spectrophotometric Method", the influent TP concentration ranged from 110.40 mg / L to 2920.00 mg / L, while the effluent concentration remained between 4 mg / L and 8 mg / L.

[0096] Water quality testing and data analysis results show that the treatment system exhibits high comprehensive removal efficiency for multiple pollutant indicators, with the following removal ranges: Chemical Oxygen Demand (COD) 95.45-99.85%; Suspended Solids (SS) 97.46-99.98%; Ammonia Nitrogen (NH3-N) 94.13-99.96%; Total Phosphorus (TP) 94.86-99.88%.

[0097] The test area exhibits significant seasonal temperature variations, with ambient temperatures ranging from 1°C to 41°C and surface water temperatures ranging from 9°C to 38°C. Within this temperature fluctuation range, the system maintained stable operation, demonstrating good temperature adaptability.

[0098] The data in this example indicate that the dissolved oxygen (DO) concentration in the surface water is relatively high (2.35–6.71 mg / L), the pH is slightly alkaline (8.13–8.21), and the dominant processes are photoautotrophic biological activity and oxidative degradation. During operation, the system requires no electricity, no chemical additives, and, in principle, no manual maintenance.

[0099] The results of Examples 8-9 above further demonstrate the excellent pollutant removal efficiency of the method and system of the present invention. Even under conditions of large fluctuations in influent load and large temperature differences, it can still maintain stable operation, indicating that it has strong resistance to shocks.

[0100] The horizontal mesh structure effectively intercepts pollutants and prevents pollutants accumulated at the bottom of the water from rising to the surface beyond the limit.

[0101] The treatment tank has a significant pollutant removal efficiency for high-concentration pig farm wastewater after solid-liquid separation. Even under conditions of large fluctuations in influent load, the system still operates stably, proving that it has good resistance to shock loads.

[0102] The above is an exemplary description of the present invention and does not represent the scope of protection of the present invention. The technical implementation methods and principle descriptions in each example have their own emphasis, so each example can be referred to by each other or combined to generate new examples; of course, since there are many examples in each example, if the technology constituted by a combination of certain examples would violate the core idea of ​​the present invention, such combination should be avoided and other possible combinations should be used.

Claims

1. A method for treating wastewater from pig farms, characterized in that, pass Vertical carriers deployed from the water surface to the bottom for biofilm attachment and pollutant interception; horizontal carriers deployed on the water surface for biofilm attachment; and vertical suspended carriers deployed from the water surface to the middle layer for biofilm attachment and pollutant interception, forming a comprehensive system. The anaerobic environment at the bottom of a water body, the facultative anaerobic environment in the middle layer, and the aerobic and facultative anaerobic environments at the surface. The wastewater from pig farms is treated using a combination of physical, chemical, and biological methods to remove pollutants.

2. The method for treating pig farm wastewater as described in claim 1, characterized in that, The composite processing step further includes: By using vertical carriers to intercept pollutants in water bodies several times, some of them settle to the bottom of the water body, while others adhere to the vertical carriers and are decomposed and metabolized by microorganisms. By using suspended carriers to intercept pollutants suspended in the surface and middle layers of water several times, some of them settle to the bottom of the water body, while others attach to the suspended carriers and are decomposed and metabolized by microorganisms. Biological fillers for microbial attachment and cultivation are added to a horizontal carrier to promote microbial attachment and reproduction.

3. The method for treating pig farm wastewater as described in claim 2, characterized in that, (1). The constructed anaerobic environment at the bottom of the water body, the facultative anaerobic environment in the middle layer of the water body, and the aerobic and facultative anaerobic environments at the surface of the water body are specifically as follows: The bottom layer of the water body is isolated from light by accumulated pollutants and blocked by horizontal carriers, forming an anaerobic environment; the middle layer of the water body is a transitional zone between the surface and the bottom layer, forming a facultative anaerobic environment, which is suitable for the growth of microorganisms in the middle layer; the surface layer of the water body constructs an attachment and reproduction environment mainly composed of photosynthetic microorganisms through horizontal carriers and biological fillers, forming and maintaining an aerobic and facultative anaerobic environment. (2). The steps also include: During seasons with high ambient temperatures, vertical mesh, horizontal mesh, and vertical suspended carriers are used to prevent pollutants accumulated at the bottom of the water body from rising to the surface beyond the limit.

4. The method for treating pig farm wastewater as described in claim 1, characterized in that, It also includes the following steps: (1) The surface water that has undergone composite treatment is treated by interception, adsorption and sedimentation. During the interception, adsorption and sedimentation process, pollutants accumulate at the bottom of the water body and form an anaerobic environment. The interception, adsorption, and precipitation processes are as follows: In areas with a cross-sectional area less than 2m²... 2 In the channel, the surface water is allowed to flow, and the water passes through the structure formed by the biofilm carrier and biological filler several times, causing pollutants to settle at the bottom of the water body. The specific interception, adsorption, and precipitation processes are handled according to the following model: in: Q represents the wastewater treatment capacity, in meters (m³). 3 / d; L represents the channel length, in meters (m). N is the filtration interval distance of the biological filter media, in meters, and must satisfy 2 ≥ N ≥ 0.5; K is the mass of biological filler material added per meter of channel, in kg, and must satisfy 10≤K≤30; C is a proportionality constant, in meters. 3 / (d·kg) is determined by factors including actual treatment efficiency and wastewater quality, and is determined through experimental data. (2) A reinforced horizontal carrier is laid on the surface of the water body, and biological filler is added to construct an attachment and reproduction environment dominated by photosynthetic microorganisms, thereby forming and maintaining an aerobic and facultative anaerobic environment. (3) For surface water that has undergone interception, adsorption and sedimentation treatment, light and reoxygenation are carried out. Specifically, the water body is lighted and reoxygenated through shallow surface flow.

5. A wastewater treatment membrane, characterized in that, include: (1) Horizontal mesh, located in the surface layer of the water; The horizontal mesh is a porous mesh fabric used for water infiltration and biofilm attachment. The horizontal mesh carries biological fillers for microbial attachment and cultivation, promoting the attachment and reproduction of microorganisms and creating an aerobic and facultative anaerobic environment on the surface of the water. The horizontal membrane has vertically downward-facing skirts around its perimeter. These skirts are made of porous mesh fabric, which forms a biofilm carrier and intercepts horizontally moving pollutants, causing them to settle. (2) Vertical mesh, which is set between the water surface and the bottom, perpendicular to the direction of water flow; the vertical mesh is a porous mesh fabric used to attach biofilm and intercept horizontally moving pollutants to settle them.

6. The wastewater treatment membrane as described in claim 5, characterized in that, The horizontal mesh is located in the surface layer of the water, within 20cm of the water surface. The horizontal mesh has buoyancy blocks around its perimeter. Both the horizontal mesh and the skirt are fixed to the buoyancy blocks. The area of ​​the horizontal mesh is larger than the frame formed by the buoyancy blocks and it sinks below the water surface. The skirt height is 40% to 60% of the average water depth; The vertical mesh has buoyancy blocks at its upper edge, and the height of the vertical mesh is greater than the maximum water depth.

7. An enhanced treatment tank for treating wastewater, characterized in that, Including cross-sectional areas less than 2m 2 Enhanced treatment channel, light-irradiated reoxygenation channel; The enhanced treatment channel contains several interception nets that allow water to permeate, and a surface mesh is set between two interception nets. Biological packing materials are placed inside the interception nets and on the surface mesh. This is used to create an anaerobic environment at the bottom of the water body and an aerobic and facultative anaerobic environment at the surface of the water body. Downstream of the enhanced treatment canal is a shallow water, light-irradiated reoxygenation canal.

8. The enhanced pool as described in claim 7, characterized in that, The enhanced treatment channel is composed of several channel sections arranged side by side, connecting the surface of the upstream enhanced treatment channel with the bottom of the next enhanced treatment channel, so that the water body repeatedly settles and the surface water body enters the downstream; the surface mesh is set in the water body surface layer within 20cm of the water surface. The light-irrigated reoxygenation channel has a water depth of less than 30cm and a width of more than 50cm. Several grooves perpendicular to the water flow direction are set at the bottom, and biological filler is placed in the grooves. The outlet of the light-irrigated reoxygenation channel is a wide opening with a width of more than 300cm to form a shallow flow. Among them, when the cross-sectional area of ​​the enhanced treatment channel is 1m 2 When this is the case, the enhanced treatment channel should be set according to the following parameters: ， in: Q represents the wastewater treatment capacity, in meters (m³). 3 / d; L represents the length of the enhanced treatment channel, in meters (m). N is the spacing between the interception nets, in meters, and must satisfy 2 ≥ N ≥ 0.5; K represents the mass of biological filler material added per meter of the enhanced treatment channel, in kg, and must satisfy 10≤K≤30; C is a proportionality constant, in meters. 3 / (d·kg) is determined by factors including actual treatment efficiency and wastewater quality, and is determined through experimental data. The length of the light-induced reoxygenation channel is 30% to 50% of that of the enhanced treatment channel, and the ratio of the horizontal projected area of ​​the enhanced treatment channel to that of the light-induced reoxygenation channel is 4 to 6:

1.

9. A wastewater treatment system for implementing the method as described in any one of claims 1 to 4; characterized in that, include: At least one treatment tank for combined wastewater treatment. The treatment tank is equipped with a wastewater treatment membrane as described in any one of claims 5 to 6, wherein the vertical membrane serves as a vertical carrier, the horizontal membrane serves as a horizontal carrier, and the skirt serves as a suspended carrier, so that the treatment tank can construct an anaerobic environment at the bottom of the water body, a facultative anaerobic environment in the middle layer of the water body, and an aerobic and facultative anaerobic environment at the surface of the water body. The inlet of the treatment tank is connected to the wastewater outlet of the pig farm; the outlet of the treatment tank is surface water.

10. The wastewater treatment system as described in claim 9, characterized in that, It includes at least two processing pools, namely a first pool and a second pool, and at least one enhancement pool as described in any one of claims 7 to 8 is provided between the first pool and the second pool; The interception net has the function of intercepting, adsorbing and settling pollutants, the surface mesh serves as a reinforced horizontal carrier, and the light-irradiated reoxygenation channel is used for light and reoxygenation. The inlet of the first pool is connected to the wastewater outlet of the pig farm; the outlet of the first pool is surface water and is connected to the inlet of the enhanced pool; the outlet of the light-induced reoxygenation channel is connected to the inlet of the second pool; the outlet of the second pool is surface water.

11. The wastewater treatment system as described in claim 10, characterized in that, The treatment pool is equipped with several vertical mesh membranes, which intercept the water flow. The two ends of the vertical mesh membranes are connected to the pool bank by ropes to fix their positions in the treatment pool. Several horizontal mesh membranes are set between the vertical mesh membranes. The horizontal mesh membranes are connected in series by ropes to form a row, which is perpendicular to the water flow direction. The ropes are connected to the pool bank to fix their positions in the first pool. Each horizontal mesh membrane has a skirt at the bottom. The horizontal mesh is spaced 10cm to 30cm apart, and the horizontal mesh is spaced 10cm to 100cm apart in each row; the vertical mesh is spaced 10cm to 50cm apart from the horizontal mesh, so that the surface layer of the water body has horizontal mesh. In the first pool, 2 to 3 rows of horizontal mesh are set between every two vertical meshes; in the second pool, 3 to 5 rows of horizontal mesh are set between every two vertical meshes.

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