Multi-stage ecological pig raising wastewater treatment system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a multi-stage ecological pig raising wastewater treatment system, which comprises an anaerobic baffled reactor, an anaerobic baffled reactor, an anaerobic baffled reactor and an anaerobic baffled reactor, a plurality of partition walls are arranged in the anaerobic baffled reaction tank and are divided into a plurality of independent anaerobic baffled reaction chambers, water passing pipes are arranged at the upper parts of the partition walls, and sewage sequentially flows among the anaerobic baffled reaction chambers through the water passing pipes; mud guide inclined walls are arranged on two sides of the bottom of the anaerobic baffling reaction tank; a settling mud inclined wall is arranged below the water outlet of the anaerobic baffling reaction tank; the multi-stage reverse-flow anaerobic biological filtration unit is communicated with the anaerobic baffling reaction tank; comprising a plurality of filter chambers filled with filler, and the filter chambers are sequentially communicated through water passing holes which are formed in a high-low staggered manner; the aerobic ecological purification system comprises a middle water tank, and part of effluent of the middle water tank flows back to the anaerobic baffled reactor and the microalgae purification tank. The device is friendly to ecological environment, low in energy consumption, small in dosage, low in operation cost and simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a multi-stage ecological pig farming wastewater treatment system. Background Art

[0002] At present, the main process used for pig wastewater treatment is "pretreatment + anaerobic treatment + aerobic treatment + deep treatment", that is, "raw wastewater → screen → water collection and mixing tank → solid-liquid separator → regulating tank → UASB → coagulation and sedimentation → two-stage AO → secondary sedimentation tank → ozone disinfection → standard discharge". This process is too complicated, requires many mechanical equipment, and has high energy consumption. It often requires the addition of a large amount of chemical agents, has a high operating cost per ton of water, and the denitrification efficiency is also low. At the same time, the process has poor impact resistance and load capacity. If it is restarted for some reason, the previous debugging work needs to be repeated and the activated sludge needs to be re-cultivated.

[0003] The main reasons for the above problems are that pig farm wastewater has a high content of suspended solids, good biodegradability, strong odor, and contains certain antibiotic residues. "Pretreatment" is carried out at the front end, such as coarse and fine mechanical screens, solid-liquid separators and flotation, to remove most of the suspended solids and reduce the processing pressure of subsequent processes; after "pretreatment", it enters "anaerobic treatment", such as black film biogas digesters, IC anaerobic reactors, UASB anaerobic reactors, etc. Pig farm wastewater, as a high-concentration organic wastewater, can convert most of the organic matter into methane and carbon dioxide through the adsorption, absorption and biodegradation of anaerobic microorganisms. However, IC anaerobic reactor and UASB anaerobic reactor are fully mixed, and the bacterial colonies are mixed together, which is generally difficult to debug, and they are not resistant to shock loads and have poor ability to remove suspended solids. Then they enter the "aerobic treatment" to remove the remaining organic matter in the anaerobic effluent. "Aerobic treatment" usually uses AO+secondary sedimentation tank. In order to enhance the denitrification and phosphorus removal effects, sludge will be set up in the secondary sedimentation tank to return to the anaerobic zone in front. Therefore, the denitrification effect is affected by the return ratio of the mixed liquid and the sludge. At the same time, the dissolved oxygen concentration needs to be controlled to avoid the anaerobic and anoxic state in the secondary sedimentation tank, and the polyphosphate release bacteria will be released. Nitrogen produced by phosphorus release or denitrification affects the precipitation effect. The dissolved oxygen concentration should not be too high to prevent the dissolved oxygen carried by the reflux liquid from affecting the anaerobic tank. When operating and maintaining the AO process, it is necessary to frequently perform microscopic inspections and monitor relevant indicators and take corresponding measures in a timely manner. If the influent concentration does not meet the operating requirements of the AO process, additional carbon sources or alkalinity supplementation are required. If the ammonia nitrogen concentration in the influent is too high, it can easily lead to microbial ammonia poisoning in the anaerobic and aerobic zones. Therefore, the process requires operation and maintenance personnel to have certain relevant professional knowledge, otherwise it is easy to cause the process to collapse and fail and cannot operate normally.

[0004] In view of the shortcomings of existing technologies, a multi-stage ecological pig wastewater treatment system is proposed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-stage ecological pig farm wastewater treatment system to solve the problems of complicated existing processes, high civil engineering costs, weak resistance to shock loads, easy collapse of the biochemical treatment section system, the need to monitor multiple indicators, and high requirements on the level of operation and maintenance personnel.

[0006] The utility model is realized by the following technical solutions:

[0007] A multi-stage ecological pig farming wastewater treatment system, comprising:

[0008] An anaerobic baffled reactor comprises an anaerobic baffled reaction tank, wherein a water inlet and a water outlet are respectively arranged on both sides of the anaerobic baffled reaction tank; a plurality of partition walls are arranged in the anaerobic baffled reaction tank, wherein the partition walls divide the anaerobic baffled reaction tank into a plurality of independent anaerobic baffled reaction chambers, wherein a water pipe is arranged on the upper part of the partition wall, and sewage flows sequentially between the anaerobic baffled reaction chambers through the water pipe; mud guiding inclined walls are arranged on both sides of the bottom of the anaerobic baffled reaction chamber, and a first mud discharge pipe is arranged at the bottom of the anaerobic baffled reaction chamber; a sedimentation mud inclined wall is arranged below the water outlet in the anaerobic baffled reaction tank, and a biogas outlet is arranged on the top of each anaerobic baffled reaction chamber;

[0009] A multi-stage countercurrent anaerobic biological filtration unit, with a water distribution port and a drainage port respectively arranged on both sides, the water distribution port being connected to the water outlet of the anaerobic baffled reaction tank; the multi-stage countercurrent anaerobic biological filtration unit comprises a plurality of filter chambers respectively filled with fillers of different pore sizes, the fillers being used to remove particles of different particle sizes in sewage, while intercepting and fixing microorganisms and forming corresponding stable biological colonies, the filter chambers being connected in sequence through water holes arranged in a staggered manner, and a second mud discharge pipe being arranged in the filter chamber below the fillers;

[0010] The aerobic ecological purification system comprises a microalgae purification pool, a primary non-powered aerobic artificial soil ecological purification unit and an intermediate water pool which are connected in sequence; the microalgae purification pool is connected to the drain outlet of the multi-stage countercurrent anaerobic biological filtration unit, part of the effluent from the intermediate water pool flows back to the anaerobic baffled reactor and the microalgae purification pool through a reflux pipe, and the remaining effluent is used for subsequent processes.

[0011] Optionally, there are six anaerobic baffled reaction chambers, and the volumes of the six anaerobic baffled reaction chambers decrease successively along the sewage flow direction; there are six filter chambers, and the fillers in the six filter chambers are successively arranged along the sewage flow direction to include polyhedral hollow ball fillers, brush filter materials, coarse ceramsite, 13 stone, fine ceramsite and 05 stone.

[0012] Optionally, the water holes are arranged in sequence along the sewage flow direction, with odd-numbered water holes arranged at a low place and even-numbered water holes arranged at a high place, and the heights of the water distribution ports and the drain ports are arranged corresponding to the water holes located at a high place; the water inlet ends of the water holes located at a low place, the water inlet ends of the water holes located at a high place and the drain ports at one end located in the anaerobic baffled reaction tank are all connected to water collection blind pipes; the water outlet ends of the water holes located at a high place and the water distribution ports at one end located in the anaerobic baffled reaction tank are all connected to water distribution blind pipes.

[0013] Optionally, a first overflow weir is provided on the inner wall of the anaerobic baffled reaction tank at the water outlet, and a second overflow weir is provided on the inner wall of the multi-stage countercurrent anaerobic biological filtration unit at the drain outlet, and the second overflow weir is provided with a water collection hole connected to a water collection blind pipe in the corresponding filter chamber; a water distribution trough is provided on the outer wall of the multi-stage countercurrent anaerobic biological filtration unit at the water distribution outlet.

[0014] Optionally, the primary unpowered aerobic artificial soil ecological purification unit includes an artificial soil layer, at least two biological filter layers and a water collection and drainage layer laid in sequence from top to bottom, a breathing and ventilation layer is arranged between two adjacent biological filter layers, and the breathing and ventilation layer is used to draw out the gas in the primary unpowered aerobic artificial soil ecological purification unit and inhale the outside air to complete the gas replacement; a water distribution pipe is arranged on the artificial soil layer, a water collection and drainage pipe is arranged in the water collection and drainage layer, the water distribution pipe of the primary unpowered aerobic artificial soil ecological purification unit is connected to the microalgae purification pool, and the water collection and drainage pipe of the primary unpowered aerobic artificial soil ecological purification unit is connected to the intermediate water pool.

[0015] Optionally, a transition layer is provided between the biological filter layer and the breathing and ventilation layer; and a breathing and ventilation pipe connected to the ground surface is arranged in the breathing and ventilation layer.

[0016] Optionally, the aerobic ecological purification system also includes a second-stage unpowered aerobic artificial soil ecological purification unit, and the remaining water from the intermediate water tank is connected to the second-stage unpowered aerobic artificial soil ecological purification unit, treated by the second-stage unpowered aerobic artificial soil ecological purification unit to meet the standards and then discharged.

[0017] Optionally, it also includes a regulating tank, a two-stage mechanical screen, a stirring tank and a feces solid-liquid separator, the regulating tank is connected to the wastewater raw water, the two-stage mechanical screen is connected to the regulating tank and the stirring tank respectively, and the feces solid-liquid separator is connected to the stirring tank and the anaerobic baffled reactor respectively.

[0018] Optionally, it also includes a sludge tank, a sludge thickening tank and a snail stacking machine, the first sludge discharge pipe and the second sludge discharge pipe are both connected to the sludge tank, the sludge tank, the sludge thickening tank and the snail stacking machine are connected in sequence, and the supernatant separated by the snail stacking machine enters the stirring tank.

[0019] Compared with the prior art, the utility model provides a multi-stage ecological pig farm wastewater treatment system, which has the following beneficial effects: the anaerobic baffled reaction tank, multi-stage countercurrent anaerobic biological filtration unit and aerobic ecological purification system arranged in the utility model are friendly to the ecological environment, have low energy consumption, small amount of medicine, low operating cost, simple operation, strong automatic operation reliability, low technical level requirements for operators, easy system startup, short debugging cycle, no odor and other advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a process flow chart of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the anaerobic baffled reactor in the utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the multi-stage countercurrent anaerobic biological filtration unit in the utility model;

[0023] Figure 4 It is a schematic diagram of the first and second level unpowered aerobic artificial soil ecological purification units in the utility model.

[0024] In the figure: 10, anaerobic baffled reactor; 11, anaerobic baffled reactor tank; 110, water inlet; 111, water outlet; 12, partition wall; 13, anaerobic baffled reactor chamber; 14, water pipe; 15, mud guide inclined wall; 16, first mud discharge pipe; 17, sedimentation mud inclined wall; 18, first overflow weir; 19, biogas outlet; 20, multi-stage countercurrent anaerobic biological filtration unit; 21, filter chamber; 210, water distribution outlet; 211, drainage outlet; 212, water distribution trough; 213, second overflow weir; 22, filler; 23, Water hole; 24, water collection blind pipe; 25, water distribution blind pipe; 26, second mud pipe; 30, aerobic ecological purification system; 31, microalgae purification pool; 32, primary non-powered aerobic artificial soil ecological purification unit; 321, artificial soil layer; 322, biological filter layer; 323, breathing and ventilation layer; 324, transition layer; 325, water collection and drainage layer; 326, water distribution pipe; 327, breathing and ventilation pipe; 328, water collection and drainage pipe; 33, intermediate water pool; 34, second-level non-powered aerobic artificial soil ecological purification unit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example: See Figures 1 to 4 As shown, according to an embodiment of the utility model, a technical solution is provided: a multi-stage ecological piggery wastewater treatment system, comprising a pretreatment device, an anaerobic baffled reactor 10, a multi-stage countercurrent anaerobic biological filtration unit 20 and an aerobic ecological purification system 30 connected in sequence. Among them:

[0027] The pretreatment equipment includes a regulating tank, a two-stage rotary mechanical screen, a stirring tank and a feces slag solid-liquid separator which are connected in sequence front and back, wherein the regulating tank is connected to the raw water of pig wastewater.

[0028] The anaerobic baffled reactor 10 includes an anaerobic baffled reaction tank 11, which can be constructed of semi-underground reinforced concrete, and the inner wall of which is appropriately treated with anti-corrosion to increase its heat preservation and anti-corrosion effects. The anaerobic baffled reaction tank 11 is provided with a water inlet 110 and a water outlet 111 on both sides, and the water inlet 110 is connected to the feces solid-liquid separator; the anaerobic baffled reaction tank 11 is provided with five partition walls 12, and the five partition walls 12 divide the anaerobic baffled reaction tank 11 into six independent anaerobic baffled reaction chambers 13. Since the sewage inlet concentration is higher than its outlet concentration, the anaerobic baffled reaction chamber 13 located upstream bears a greater local load, so the volume of the six anaerobic baffled reaction chambers 13 decreases in sequence along the sewage flow direction, especially the volume of the first anaerobic baffled reaction chamber 13 is more significant, and a water pipe 14 is provided on the upper part of the partition wall 12, and the sewage flows in sequence between the anaerobic baffled reaction chambers 13 through the water pipe 14. The bottom of the anaerobic baffled reaction chamber 13 is provided with mud guide inclined walls 15 on both sides, and the bottom of the anaerobic baffled reaction chamber 13 is provided with a first mud discharge pipe 16; the anaerobic baffled reaction tank 11 is provided with a mud settling inclined wall 17 below the water outlet 111, and the mud guide inclined wall 15 and the mud settling inclined wall 17 can make the sludge settle better at the bottom of the tank to prevent the sludge from overflowing. When treating high-concentration piggery wastewater, a large amount of biogas will be generated, and the rising biogas can promote the mixing of wastewater and sludge, so a biogas outlet 19 is provided at the top of each anaerobic baffled reaction chamber 13, and the biogas outlet 19 can be connected to an external biogas collection system.

[0029] A water outlet 210 and a drain outlet 211 are respectively provided on both sides of the multi-stage countercurrent anaerobic biological filtration unit 20, and the water outlet 210 is connected to the outlet 111 of the anaerobic baffled reaction tank 11; the multi-stage countercurrent anaerobic biological filtration unit 20 includes six filter chambers 21 respectively filled with fillers 22 of different pore sizes, and the particle size of the fillers 22 in the six filter chambers 21 gradually decreases along the flow direction of sewage, and can be specifically set to polyhedral hollow ball fillers, brush filter materials, coarse ceramsite, 13 stone, fine ceramsite and 05 stone in sequence. The fillers 22 are used to remove particles of different sizes in sewage, and at the same time intercept and fix microorganisms and form corresponding stable biological colonies. The six filter chambers 21 The five water holes 23 are arranged in sequence along the sewage flow direction, with the water holes 23 with odd numbers being arranged at a low place and the water holes 23 with even numbers being arranged at a high place. The heights of the water distribution port 210 and the drainage port 211 are arranged corresponding to the water holes 23 located at a high place; the water inlet end of the water hole 23 located at a low place, the water inlet end of the water hole 23 located at a high place and the end of the drainage port 211 located in the anaerobic baffled reaction tank 11 are all connected with a water collecting blind pipe 24; the water outlet end of the water hole 23 located at a high place and the end of the water distribution port 210 located in the anaerobic baffled reaction tank 11 are all connected with a water distribution blind pipe 25. A transversely arranged fiberglass grille for supporting each filler 22 is fixedly connected to the lower part of the filter chamber 21. The bottom of the fiberglass grille is supported by vertically distributed galvanized channel steel. A second mud discharge pipe 26 is provided in the filter chamber 21 below the filler 22 and beside the galvanized channel steel.

[0030] The aerobic ecological purification system 30 includes a microalgae purification pool 31, a primary non-powered aerobic artificial soil ecological purification unit 32 and an intermediate water pool 33 which are connected in sequence. The primary non-powered aerobic artificial soil ecological purification unit 32 includes an artificial soil layer 321, at least two biological filter layers 322 and a water collection and drainage layer 325 which are laid in sequence from top to bottom. A breathing and ventilation layer 323 is arranged between two adjacent biological filter layers 322. The breathing and ventilation layer 323 is used to draw out the gas in the primary non-powered aerobic artificial soil ecological purification unit 32 and inhale the outside air to complete the gas replacement. A breathing and ventilation pipe 327 connected to the ground surface is arranged in the breathing and ventilation layer 323, and a transition layer 324 is arranged between the biological filter layer 322 and the breathing and ventilation layer 323. The artificial soil layer 321 is mostly made of medium sand or coarse sand. This layer has a large number of ultra-micro soil microorganisms such as bacteria, archaea, and fungi that are unique to the aerobic soil environment. The artificial soil layer 321 can be used to plant landscape plants or economic crops with strong adaptability. A water distribution pipe 326 is arranged on the artificial soil layer 321. The biological filter layer 322 and the breathing and ventilation layer 323 can be increased or decreased according to the requirements of water quality and quantity. The biological filter layer 322 is composed of pure quartz sand or pure machine-made sand with a smaller particle size, or the former two are mixed with carbon powder (particles) in a certain proportion to form a matrix filter material. The breathing and ventilation layer 323 is physically layered with coarse crushed stone or coarse gravel. The water collection and drainage layer 325 is filled with fillers with larger particle sizes. A water collection and drainage pipe 328 is arranged in the water collection and drainage layer 325, and the treated water is discharged through the water collection and drainage pipe 328. The primary non-powered aerobic artificial soil ecological purification unit 32 adopts intermittent water inlet to ensure the oxygenation effect. The overall environment is aerobic and the microenvironment is anoxic and anaerobic.

[0031] The microalgae purification pool 31 is connected to the drain port 211 of the multi-stage countercurrent anaerobic biological filtration unit 20. Part of the effluent from the intermediate water pool 33 flows back to the anaerobic baffled reactor 10 and the microalgae purification pool 31 through the reflux pipe, and the remaining effluent is used for subsequent processes.

[0032] The multi-stage ecological pig farm wastewater treatment system also includes a sludge tank, a sludge thickening tank and a snail stacker. The first sludge discharge pipe 16 and the second sludge discharge pipe 26 are both connected to the sludge tank. The sludge tank, the sludge thickening tank and the snail stacker are connected in sequence. The supernatant separated by the snail stacker enters the stirring tank, and the mud cake generated by the snail stacker is handed over to a qualified unit for treatment.

[0033] On the basis of the above-mentioned embodiment, a first overflow weir 18 is arranged on the inner wall of the anaerobic baffled reaction tank 11 at the water outlet 111, a second overflow weir 213 is arranged on the inner wall of the multi-stage countercurrent anaerobic biological filtration unit 20 at the drain outlet 211, and the second overflow weir 213 is provided with a water collection hole connected to the water collection blind pipe 24 in the corresponding filter chamber 21; a water distribution trough 212 is arranged on the outer wall of the multi-stage countercurrent anaerobic biological filtration unit 20 at the water distribution outlet 210.

[0034] On the basis of the above embodiment, the aerobic ecological purification system 30 further includes a second-stage unpowered aerobic artificial soil ecological purification unit 34, and the structure of the second-stage unpowered aerobic artificial soil ecological purification unit 34 is set with reference to the primary unpowered aerobic artificial soil ecological purification unit 32. Part of the effluent from the intermediate water tank 33 is connected to the anaerobic baffled reactor 10 and the microalgae purification pool 31 through a shunt pipe for further denitrification, and part of the effluent is returned to the water inlet 110 of the anaerobic baffled reactor 10 and the microalgae purification pool 31 by a pump, and the remaining effluent is connected to the second-stage unpowered aerobic artificial soil ecological purification unit 34, and finally treated by the second-stage unpowered aerobic artificial soil ecological purification unit 34 to meet the standards and discharged.

[0035] It should be noted that the sewage first enters the equalization tank, and alkali solution is added to the equalization tank to adjust its pH value. The sewage in the equalization tank is then pumped into a two-stage rotary mechanical screen to remove large suspended matter such as pig hair and epidemic prevention waste. The sewage then enters the mixing tank, which is equipped with a mixer. The mixer mixes the feces and wastewater evenly and then pumps them into a feces solid-liquid separator. The separated feces can be processed into organic fertilizer, which is generally transported out for resource utilization.

[0036] The wastewater after solid-liquid separation can flow to the anaerobic baffled reactor 10 by gravity. The function of the anaerobic baffled reactor 10 is to use anaerobic bacteria to perform anaerobic digestion reaction on high-concentration aquaculture wastewater, so that organic matter undergoes hydrolysis stage, acidification stage, and methanation stage, and is converted into methane, carbon dioxide, water, hydrogen sulfide, and ammonia. The six anaerobic baffled reaction chambers 13 are connected in series in the direction of sewage flow, and are independent of each other. In each reaction chamber, a microbial community that is adapted to the culture can be domesticated and cultivated, and at the same time, the back-mixing effect in the reaction chamber is blocked to reduce the occurrence of sludge expansion and other phenomena. A plurality of water pipes 14 are arranged on the partition wall 12. When the sewage enters the next anaerobic baffled reaction chamber 13 from the water pipe 14, it will impact the sludge deposited at the bottom from top to bottom, and so on. In order to prevent the first anaerobic baffled reaction chamber 13 from excessive acidification, a sodium bicarbonate dosing pipeline can be set for it. In order to enhance the phosphorus removal effect, a phosphorus removal agent dosing pipeline can be set in the sixth anaerobic baffled reaction chamber 13 for regular addition.

[0037] The anaerobic baffled reactor 10 has a simple structure, low cost, low energy consumption, high volume utilization rate, good water conservancy conditions, strong impact load resistance, low sludge bed expansion, and good tolerance to toxic and harmful substances in the influent.

[0038] After passing through the anaerobic baffled reactor 10, the wastewater flows by gravity to the multi-stage countercurrent anaerobic biological filtration unit 20, and flows in an S shape between each filter chamber 21. The multi-stage countercurrent anaerobic biological filtration unit 20 uses fillers 22 to filter out tiny suspended matter and degrade some organic pollutants. By arranging fillers 22 with different pore sizes, the suspended matter can be intercepted. At the same time, a large number of bacterial flocs are attached to the fillers 22, and the bacterial flocs can degrade some pollutants. Through the division of the pool body, each unit can independently cultivate a dominant bacterial community. The fillers inside the pool body help to intercept the same microorganisms and form a stable biological colony, thereby ensuring the stable operation of the system. At the same time, the unit also has a very good SS removal ability, is not easy to form a dead water area, is easy to start and debug, has a high impact load resistance, can effectively remove COD, realize anaerobic ammonia oxidation, and short-range nitrification.

[0039] After being treated by the multi-stage countercurrent anaerobic biological filtration unit 20, the wastewater flows by gravity into the microalgae purification pool 31. Algae such as Chlorella and diatoms are planted in the pool. The algae are used to absorb organic carbon sources in the wastewater, remove nitrogen and phosphorus, and metabolize and utilize organic pollutants in the wastewater. A lifting pump is provided in the microalgae purification pool 31 to regularly pump the wastewater into the water distribution pipe 326 of the primary non-powered aerobic artificial soil ecological purification unit 32. The effluent of the primary non-powered aerobic artificial soil ecological purification unit 32 is discharged to the intermediate water pool 33 through the water collection and drainage pipe 328. Then, part of the effluent is returned to the anaerobic baffled reactor 10 and the microalgae purification pool 31 by the intermediate water pool 33 through the lifting pump, and the rest of the effluent is pumped to the second-stage non-powered aerobic artificial soil ecological purification unit 34. Finally, the second-stage non-powered aerobic artificial soil ecological purification unit 34 treats the wastewater to meet the standards and discharges the effluent. The primary and secondary non-powered aerobic artificial soil ecological purification units 32 and 34 effectively degrade and purify organic pollutants in wastewater through the large number of microbial flora in the artificial soil layer, so that suspended solids, nitrogen and phosphorus in the sewage can be further purified and removed. At the same time, the adsorption and interception effect of the biological filter layer 322 and the roots of water purification plants can prevent the loss of microorganisms and effectively domesticate specific flora.

[0040] The primary and secondary unpowered aerobic artificial soil ecological purification units 32 and 34 do not require additional power for oxygen supply, and use the respiration generated by the internal and external pressure difference during the hydraulic infiltration process to supply oxygen to the microorganisms in the filler matrix inside the unit; the unit does not produce excess activated sludge, and there is no secondary pollution such as noise and odor; the operation and maintenance cost is low, there is no blower, and no need to add medicine. It can not only plant landscape plants to build park or courtyard-style water purification modules, but also plant plants that can generate economic benefits and harvest them for use after they grow up; the unit is simple to operate, does not need to control the carbon-nitrogen ratio of the incoming water and detect the concentration of microorganisms, and does not have complex mechanical equipment. Even ordinary workers can operate and maintain it; the rich microbial flora in the filler matrix can biologically inhibit harmful pathogens and disinfect harmful pathogens in wastewater; the water quality of the unit effluent is stable and can withstand the impact of changes in water quality and water quantity. If the unit is temporarily stopped, it can be quickly restarted.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage ecological pig farming wastewater treatment system, characterized in that: include: An anaerobic baffled reactor (10) comprises an anaerobic baffled reaction tank (11), wherein a water inlet (110) and a water outlet (111) are respectively arranged on both sides of the anaerobic baffled reaction tank (11); a plurality of partition walls (12) are arranged in the anaerobic baffled reaction tank (11), wherein the partition walls (12) divide the anaerobic baffled reaction tank (11) into a plurality of independent anaerobic baffled reaction chambers (13); a water pipe (14) is arranged on the upper part of the partition wall (12); Sewage flows sequentially between the anaerobic baffled reaction chambers (13) through a water pipe (14); mud-guiding inclined walls (15) are provided on both sides of the bottom of the anaerobic baffled reaction chamber (13); a first mud discharge pipe (16) is provided at the bottom of the anaerobic baffled reaction chamber (13); a mud settling inclined wall (17) is provided below the water outlet (111) in the anaerobic baffled reaction tank (11); and a biogas outlet (19) is provided at the top of each anaerobic baffled reaction chamber (13); A multi-stage countercurrent anaerobic biological filtration unit (20) is provided with a water distribution port (210) and a drainage port (211) on both sides thereof, the water distribution port (210) being connected to a water outlet (111) of the anaerobic baffled reaction tank (11); the multi-stage countercurrent anaerobic biological filtration unit (20) comprises a plurality of filter chambers (21) respectively filled with fillers (22) of different pore sizes, the fillers (22) being used to remove particles of different particle sizes in sewage, while intercepting and fixing microorganisms and forming corresponding stable biological colonies, the filter chambers (21) being connected in sequence through water holes (23) arranged in a staggered manner, and a second mud discharge pipe (26) being provided in the filter chamber (21) below the fillers (22); The aerobic ecological purification system (30) comprises a microalgae purification pool (31), a primary non-powered aerobic artificial soil ecological purification unit (32) and an intermediate water pool (33) which are connected in sequence; the microalgae purification pool (31) is connected to the drainage port (211) of the multi-stage countercurrent anaerobic biological filtration unit (20); part of the effluent from the intermediate water pool (33) flows back to the anaerobic baffled reactor (10) and the microalgae purification pool (31) through a return pipe, and the remaining effluent is subjected to subsequent processes.

2. A multi-stage ecological pig farming wastewater treatment system according to claim 1, characterized in that: The anaerobic baffled reaction chambers (13) are provided with six, and the volumes of the six anaerobic baffled reaction chambers (13) decrease in sequence along the flow direction of the sewage; the filter chambers (21) are provided with six, and the fillers (22) in the six filter chambers (21) are arranged in sequence along the flow direction of the sewage to include polyhedral hollow ball fillers, brush filter materials, coarse ceramsite, 13 stone, fine ceramsite and 05 stone.

3. A multi-stage ecological pig farming wastewater treatment system according to claim 1, characterized in that: The water holes (23) are arranged in sequence along the flow direction of sewage, the water holes (23) with odd numbers are arranged at a low position, and the water holes (23) with even numbers are arranged at a high position, and the heights of the water distribution port (210) and the drainage port (211) are arranged corresponding to the water holes (23) located at a high position; the water inlet end of the water hole (23) located at a low position, the water inlet end of the water hole (23) located at a high position, and one end of the drainage port (211) located in the anaerobic baffled reaction tank (11) are all connected to a water collection blind pipe (24); the water outlet end of the water hole (23) located at a high position and one end of the water distribution port (210) located in the anaerobic baffled reaction tank (11) are all connected to a water distribution blind pipe (25).

4. A multi-stage ecological pig farming wastewater treatment system according to claim 1, characterized in that: The inner wall of the anaerobic baffled reaction tank (11) is provided with a first overflow weir (18) at the water outlet (111); the inner wall of the multi-stage countercurrent anaerobic biological filtration unit (20) is provided with a second overflow weir (213) at the water outlet (211); the second overflow weir (213) is provided with a water collection hole connected to a water collection blind pipe (24) in the corresponding filter chamber (21); and the outer wall of the multi-stage countercurrent anaerobic biological filtration unit (20) is provided with a water distribution trough (212) at the water distribution outlet (210).

5. A multi-stage ecological pig farming wastewater treatment system according to claim 1, characterized in that: The primary non-powered aerobic artificial soil ecological purification unit (32) comprises an artificial soil layer (321) laid in sequence from top to bottom, at least two biological filter layers (322) and a water collection and drainage layer (325); a breathing and ventilation layer (323) is arranged between two adjacent biological filter layers (322); the breathing and ventilation layer (323) is used to draw out the gas in the primary non-powered aerobic artificial soil ecological purification unit (32) and inhale the outside air to complete the gas replacement; a water distribution pipe (326) is arranged on the artificial soil layer (321); a water collection and drainage pipe (328) is arranged in the water collection and drainage layer (325); the water distribution pipe (326) of the primary non-powered aerobic artificial soil ecological purification unit (32) is connected to the microalgae purification pool (31); and the water collection and drainage pipe (328) of the primary non-powered aerobic artificial soil ecological purification unit (32) is connected to the intermediate water pool (33).

6. A multi-stage ecological pig farming wastewater treatment system according to claim 5, characterized in that: A transition layer (324) is provided between the biological filter layer (322) and the breathing and ventilation layer (323); a breathing and ventilation pipe (327) connected to the ground surface is arranged in the breathing and ventilation layer (323).

7. A multi-stage ecological piggery wastewater treatment system according to claim 5, characterized in that: The aerobic ecological purification system (30) further comprises a second-stage non-powered aerobic artificial soil ecological purification unit (34); the remaining effluent from the intermediate water pool (33) is connected to the second-stage non-powered aerobic artificial soil ecological purification unit (34), and is treated by the second-stage non-powered aerobic artificial soil ecological purification unit (34) to meet the standards and then discharged.

8. The multi-stage ecological pig farming wastewater treatment system according to claim 1, characterized in that: It also includes a regulating tank, a two-stage mechanical screen, a stirring tank and a feces solid-liquid separator, wherein the regulating tank is connected to the wastewater source, the two-stage mechanical screen is respectively connected to the regulating tank and the stirring tank, and the feces solid-liquid separator is respectively connected to the stirring tank and the anaerobic baffled reactor (10).

9. A multi-stage ecological pig farming wastewater treatment system according to claim 8, characterized in that: It also includes a sludge tank, a sludge thickening tank and a snail stacking machine, wherein the first sludge discharge pipe (16) and the second sludge discharge pipe (26) are both connected to the sludge tank, the sludge thickening tank and the snail stacking machine are connected in sequence, and the supernatant separated by the snail stacking machine enters the stirring tank.

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