Resource co-processing system and method for three wastes in large-scale livestock and poultry breeding

Abstract

The invention provides a recycling cooperative treatment system and method for three wastes in large-scale livestock and poultry breeding. The system comprises a pretreatment unit, a grating and a solid-liquid separator, wherein the solid-liquid separator is used for carrying out solid-liquid separation on livestock and poultry manure, and wastewater is coagulated and settled in a primary settling tank; the wastewater recycling unit is used for removing high-concentration organic matters from wastewater in a UASB reactor, purifying and utilizing generated biogas, settling the wastewater in an anaerobic settling tank, then feeding the wastewater into an AO-Anammox tank for denitrification, saving the aeration rate by 62.5%, feeding the wastewater into a final settling tank for dosing and dephosphorization, carrying out ozone oxidation treatment, and discharging most treated water into a municipal pipe network; in the circulating deodorization unit, a small part of treated water flows into a reclaimed water recycling workshop and is pumped into a deodorization room through a recycling water pump to remove breeding waste gas, and the outflowing deodorized water is converged into the anaerobic sedimentation tank to be continuously treated; and manure residues and sludge generated by the solid waste recycling unit and the pretreatment unit and concentrated sludge generated by the biochemical pool are subjected to dehydration treatment, composting and returning to the field.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental protection and resource utilization, and particularly relates to a resource-based collaborative treatment system and method for the three wastes in large-scale livestock and poultry breeding. Background Art

[0002] With the economic development and the increasing market demand, the scale of livestock and poultry breeding in China has been continuously expanding. At present, livestock and poultry breeding has become one of the pillar industries of China's agricultural economy. According to the calculation of the second national pollution source census, the annual output of livestock and poultry manure in China is about 3.05 billion tons, which makes the problem of livestock and poultry breeding pollution prevention and control in China increasingly prominent. At the same time, China's livestock and poultry breeding is transforming from the traditional breeding mode to the large-scale breeding mode. Although large-scale livestock and poultry breeding has higher production efficiency and profitability, it also brings more serious environmental pollution problems. On the one hand, large-scale breeding farms are generally built in the suburbs of cities and the urban-rural fringe, which is easy to affect the surrounding environment; on the other hand, the large-scale breeding mode will generate a large amount of livestock and poultry waste, and improper treatment will cause serious pollution to the environment.

[0003] The problem of the three wastes in livestock and poultry breeding is an important challenge faced by the current livestock and poultry breeding pollution prevention and control. The "three wastes" refer to the wastewater, waste gas and waste residue generated in the process of livestock and poultry breeding. The wastewater mainly comes from the urine of livestock and poultry and the sewage generated by flushing the livestock and poultry houses. Its composition is complex, containing a large amount of organic matter, high-concentration nitrogen and phosphorus nutrients, heavy metals, as well as germs and parasite eggs, etc.; the waste gas mainly includes the malodorous gas generated during the accumulation and fermentation of livestock and poultry manure, such as hydrogen sulfide, ammonia, indole, etc.; the waste residue is mainly livestock and poultry manure, which has a large output and contains rich organic matter. From the perspective of resource utilization, it is a potential raw material for organic fertilizer, but if not handled well, it will be a major pollution source.

[0004] The treatment process of the three wastes in traditional large-scale livestock and poultry breeding will cause a large amount of energy consumption and low resource utilization, which is very unfriendly to the characteristics of high cost and low profit in the livestock and poultry breeding industry. Therefore, it is necessary to develop a low-cost, low-energy-consuming and resource-based treatment technology for the three wastes in large-scale livestock and poultry breeding to create a good breeding environment and realize the sustainable development of the livestock and poultry breeding industry. Summary of the Invention

[0005] In order to solve the problems in the prior art that the treatment process of the three wastes in livestock and poultry breeding has large energy consumption, low resource utilization rate, difficult treatment of breeding wastewater with high-concentration organic matter and nitrogen and phosphorus, difficult treatment of breeding waste gas with harmful components, and low utilization rate of breeding waste residue, etc., the present invention provides a resource-based collaborative treatment system and method for the three wastes in large-scale livestock and poultry breeding.

[0006] The present invention provides a resource-based coordinated treatment system for three wastes from large-scale livestock and poultry breeding, the system comprising a pretreatment unit, a wastewater resource unit, a circulation deodorization unit and a solid waste resource unit; the pretreatment unit is used for solid-liquid separation of livestock and poultry manure after removing large-volume floating objects, and the separated wastewater is coagulated and precipitated and then transported to the wastewater resource unit, and the separated manure residue and generated sludge are transported to the solid waste resource unit; the wastewater resource unit is used for sequentially removing high-concentration organic matter, denitrification, dephosphorization and contact oxidation operations on wastewater, and then 20% of the treated water is transported to the circulation deodorization unit, 80% of the treated water is discharged to the municipal pipe network, and the generated sludge is transported to the solid waste resource unit; the generated biogas is also collected and purified for utilization; the circulation deodorization unit is used for storing wastewater for reuse, and dissolving the breeding waste gas in water to form deodorized water and then returning it to the wastewater resource unit for reuse; the solid waste resource unit is used for concentrating and dehydrating manure residue and sludge.

[0007] Furthermore, the pretreatment unit includes a grid, a two-stage solid-liquid classifier, a regulating tank and a primary sedimentation tank connected in sequence; the grid is used to intercept large-volume floating objects in livestock and poultry manure; the two-stage solid-liquid classifier is used to separate the solid and liquid of livestock and poultry manure; the regulating tank is used to regulate the water quality and quantity of wastewater, and the primary sedimentation tank is used to coagulate and precipitate the wastewater.

[0008] Furthermore, the solid-liquid separator includes a connected primary solid-liquid separator and a secondary solid-liquid separator; a stirrer is provided in the primary sedimentation tank, and PAM agent is also added into the primary sedimentation tank to flocculate and precipitate the particles in the wastewater under the action of the stirrer.

[0009] Furthermore, the wastewater resource utilization unit includes a UASB reactor, an anaerobic sedimentation tank, an AO-Anammox tank, a final sedimentation tank and an ozone reaction tank which are connected in sequence; the UASB reactor is used to remove high-concentration organic matter in the wastewater; the anaerobic sedimentation tank is used to continue to remove suspended matter from the effluent of the UASB reactor, prevent anaerobic sludge from running, recover part of the anaerobic sludge, and add the deodorized water into the wastewater; the AO-Anammox tank is used to denitrify the wastewater; the final sedimentation tank is used to add PAC agent to the wastewater to adsorb and complex sulfate ions to achieve the purpose of phosphorus removal; the ozone reaction tank is used to use ozone contact oxidation to degrade the difficult-to-degrade organic matter, colloids, and heavy metal substances in the wastewater on the one hand, and to achieve the purpose of decolorization and deodorization on the other hand.

[0010] Furthermore, the AO-Anammox tank includes an A tank, an O tank, a primary sedimentation tank, an anaerobic ammonium oxidation tank, and a secondary sedimentation tank connected in sequence. The primary sedimentation tank is also connected to the O tank, and the secondary sedimentation tank is also connected to the anaerobic ammonium oxidation tank. The A tank and the O tank are used to cooperate in the preliminary denitrification of wastewater and provide substrates for the anaerobic ammonium oxidation reaction. The primary sedimentation tank is used to precipitate the sludge generated in the O tank and return part of the sludge to the A tank. The anaerobic ammonium oxidation tank is used to remove ammonia nitrogen in the wastewater. The secondary sedimentation tank is used to precipitate the sludge generated in the anaerobic ammonium oxidation tank and return part of the sludge to the anaerobic ammonium oxidation tank.

[0011] Furthermore, the wastewater resource utilization unit includes a gas holder, a biogas purification component, and a boiler house connected in sequence. The gas holder and the boiler house are also respectively connected to the UASB reactor. The gas holder is used to collect the biogas generated by the UASB reactor. The biogas purification component is used to dehydrate and alkali-wash the biogas and then connect it to the boiler house to supply heat to the plant area and the UASB reactor.

[0012] Furthermore, the circulating deodorization unit includes a reclaimed water reuse workshop and a deodorization workshop connected to each other. The inlet end of the reclaimed water reuse workshop is connected to the ozone reaction tank, and the outlet end of the deodorization workshop is connected to the anaerobic sedimentation tank. Among them, the reclaimed water reuse workshop includes a reclaimed water tank and a reclaimed water pump connected in sequence. The deodorization workshop includes a blower, and a reservoir, a deodorization filter wall, and a deodorization adjustment tank connected in sequence. The inlet end of the reservoir is connected to the outlet end of the reclaimed water tank through the reclaimed water pump.

[0013] Furthermore, the solid waste resource utilization unit includes a pretreatment sludge tank, a dehydration workshop, and a drying yard connected in sequence, and a biochemical sludge filtrate tank and a sludge thickening tank connected to each other. The pretreatment sludge tank is respectively connected to the outlet ends of the two-stage solid-liquid classifier and the primary sedimentation tank. The sludge thickening tank is respectively connected to the outlet ends of the UASB reactor, the anaerobic sedimentation tank, the AO-Anammox tank, and the final sedimentation tank. The sludge thickening tank is also connected to the dehydration workshop. The pretreatment sludge tank is used to store the manure residue after solid-liquid separation in the pretreatment unit and the sludge discharged from the primary sedimentation tank. The biochemical sludge filtrate tank is used to collect and store the sludge discharged from the UASB reactor, the anaerobic sedimentation tank, the AO-Anammox tank, and the final sedimentation tank in the wastewater resource utilization unit, and discharge it into the sludge thickening tank to concentrate the sludge. The dehydration workshop is used to dehydrate the manure residue and sludge and transport them to the drying yard to add crops to the composting area for composting.

[0014] The present invention also provides a resource collaborative treatment method for the three wastes in large-scale livestock and poultry breeding, which is applied to the resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding as described above; the method includes: S1: Solid-liquid separation is carried out on livestock and poultry manure sewage, and the separated wastewater is added with a coagulant for coagulation and precipitation; S2: High-concentration organic matter is removed from the wastewater, biogas is generated and purified for utilization, and then nitrogen is removed, phosphorus is removed, and contact oxidation is carried out. After treatment, a part of the water enters the deodorization process, and the other part of the water is discharged into the municipal sewage pipe; S3: The exhaust gas is dissolved in the treated water to form deodorized water, and the deodorized water is returned to be mixed with the separated wastewater for subsequent treatment; S4: The separated manure residue and the discharged sludge are sequentially subjected to concentration and dehydration treatment.

[0015] Further, the method specifically includes: S1: The pretreatment unit carries out solid-liquid separation on livestock and poultry manure sewage, and the separated wastewater is added with a coagulant for coagulation and precipitation; S2: The wastewater separated by the pretreatment unit removes high-concentration organic matter in the UASB reactor, generates biogas and is purified for utilization. The wastewater is denitrified in the AO-Anammox pool, and phosphorus is removed by adding medicine in the final sedimentation tank, and contact oxidation is carried out in the ozone reaction tank. 80% of the water after treatment is discharged into the municipal sewage pipe; S3: 20% of the water after treatment by the wastewater resource unit enters the circulating deodorization unit, is stored in the intermediate water reuse workshop and pumped into the reservoir in the deodorization room by the recycled water pump. The exhaust gas in the large-scale pig breeding house is extracted by the fan and transmitted to the deodorization filter wall in the deodorization room. The deodorization filter wall sprays to dissolve the exhaust gas in water to form deodorized water, and the deodorized water flows into the deodorization adjustment pool for temporary storage, and then enters the anaerobic sedimentation tank of the wastewater resource unit to be mixed with the breeding wastewater for subsequent treatment; S4: The manure residue separated by solid-liquid separation in the pretreatment unit and the sludge discharged from the primary sedimentation tank are stored in the pretreatment sludge tank and dehydrated by a spiral press in the dehydration workshop; the sludge discharged from the UASB reactor, anaerobic sedimentation tank, AO-Anammox pool and final sedimentation tank in the wastewater resource unit is stored in the biochemical sludge filtrate tank, concentrated in the sludge concentration tank, and dehydrated by a spiral press in the dehydration workshop; the manure residue and the sludge are transported to the drying yard after dehydration, and plant straw and crops are added to the composting area for composting, which is used for planting kumquats in the factory area.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The resource collaborative treatment system and method for the three wastes in large-scale livestock and poultry breeding proposed by the present invention. Among them, the anaerobic ammonium oxidation technology can efficiently remove nitrogen while reducing the aeration volume by about 62.5%. Compared with the traditional nitrogen removal technology, it greatly reduces the energy consumption and does not require additional carbon source addition, meeting the requirements of the green and low-carbon era. The biogas generated after anaerobic fermentation is used as a renewable energy source, which not only improves the resource utilization rate but also reduces the emission of greenhouse gases. The recycling of the deodorized water realizes the reduction of water resource consumption and overall reduces the cost of treating waste gas. After a series of stabilization and reduction processes, livestock and poultry manure and sludge are converted into organic fertilizers, turning waste into treasure. In summary, this treatment process realizes waste resourceization in the collaborative treatment of the three wastes in livestock and poultry breeding, plays a significant role in reducing environmental pollution, energy consumption and operating costs, and helps to promote the sustainable development of rural economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0019] Figure 1 It is a flowchart of the resource collaborative treatment method for the three wastes in large-scale livestock and poultry breeding provided by the embodiments of the present invention;

[0020] Figure 2 It is a structural diagram of the resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding provided by the embodiments of the present invention;

[0021] Figure 3 It is a structure diagram of the UASB reactor and biogas utilization in the resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding provided by the embodiments of the present invention;

[0022] Figure 4 It is a structural diagram of the AO-Anammox tank in the resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding provided by the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made with reference to the drawings, but it should not be construed as a limitation on the scope of the present invention that can be implemented.

[0024] The present invention provides a resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding, including: a pretreatment unit, a wastewater resourceization unit, a circulating deodorization unit and a solid waste resourceization unit.

[0025] The pretreatment unit includes: screen, two-stage solid-liquid classifier, regulating tank and primary sedimentation tank. The screen intercepts large floating objects in livestock and poultry manure. The two-stage solid-liquid separator separates manure and water, and the separated wastewater enters the regulating tank for temporary storage. The regulating tank achieves homogenization of filtrate water quality through pre-aeration. Flocculants are added to the coagulation zone of the primary sedimentation tank, and a mixer is used to accelerate coagulation, and sedimentation is carried out in the primary sedimentation tank.

[0026] The wastewater resource unit includes: UASB reactor, biogas purification and utilization device, anaerobic sedimentation tank, AO-Anammox tank, final sedimentation tank and ozone reaction tank. The biogas produced by the UASB reactor can be connected to the boiler room on site after purification to generate heat for the UASB reactor. The anaerobic sedimentation tank continues to remove suspended solids from the effluent of the UASB reactor to prevent anaerobic sludge and recover part of the anaerobic sludge. The AO-Anammox tank is composed of A tank, O tank, first sedimentation tank, anaerobic ammonium oxidation tank and second sedimentation tank connected in sequence. A tank and O tank are initially denitrified, and the anaerobic ammonium oxidation reaction tank is deeply denitrified. Part of the sludge in the first sedimentation tank is returned to A tank, and part of the sludge in the second sedimentation tank is returned to the anaerobic ammonium oxidation tank. PAC reagent is added to the final sedimentation tank, and stirring is used to assist in phosphorus removal. The ozone reaction tank uses ozone contact oxidation to remove refractory substances. After treatment, 80% of the water is discharged into the municipal pipe network, and 20% of the water enters the circulating deodorization unit.

[0027] The circulating deodorization unit includes a water reuse workshop and a deodorization workshop. The water reuse pool includes a reuse water pool and a reuse water pump. The deodorization workshop includes a reservoir, a fan, a deodorization filter wall, and a deodorization regulating pool. The reuse water pool stores the reclaimed water, and the reuse water pump pumps the reclaimed water into the reservoir of the deodorization room to supply water for the spraying device of the deodorization filter wall. The fan collects the aquaculture waste gas and produces deodorized water through the deodorization filter wall. The deodorization regulating pool stabilizes the water quality and adjusts the flow rate. The deodorized water flows into the sedimentation tank of the wastewater resource unit for subsequent treatment.

[0028] The solid waste resource unit includes a pretreatment sludge tank, a biochemical sludge filtrate tank, a sludge concentration tank, a dewatering workshop, a drying yard and a composting area. The pretreatment sludge tank collects the feces separated from the solid-liquid separation in the pretreatment unit and the sludge discharged from the primary sedimentation tank. The biochemical sludge filtrate tank collects the sludge discharged from the UASB reactor, the sedimentation tank, the AO-Anammox tank and the final sedimentation tank in the wastewater resource unit. The sludge concentration tank concentrates and reduces the biochemical sludge. The screw stacking machine in the dewatering workshop dehydrates the sludge and feces. After dehydration, the feces and sludge are placed in the drying yard, and crops such as plant straw are added to the composting area for composting, which is used to plant kumquats and the like in the factory area.

[0029] Based on the system provided above, the present invention provides a resource-based collaborative treatment method for large-scale livestock and poultry breeding wastes, comprising the following steps:

[0030] S1: The grille intercepts large-volume floating substances in livestock and poultry manure. The two-stage solid-liquid separator separates feces and wastewater. The separated wastewater enters the regulation tank for temporary storage and flow regulation. The regulation tank achieves homogeneous treatment of the filtrate water quality through pre-aeration, and the aeration volume is controlled at 0.5 - 0.8 m 3 / (m 3 ·h). About 5 mg / L of flocculant PAM is added to the coagulation zone of the primary sedimentation tank, and stirring is carried out to accelerate coagulation. Small particulate matters are precipitated in the primary sedimentation tank.

[0031] S2: The wastewater after solid-liquid separation enters the UASB reactor to remove high-concentration organic matters. The COD removal rate is greater than 80%, and the operating temperature is between 30 - 35 °C. The biogas is collected and stored in the gas holder. After dehydration and alkali washing, it is sent to the on-site boiler room to be converted into heat source for heating the UASB reactor, etc. The anaerobic sedimentation tank continues to remove the suspended substances in the effluent of the UASB reactor, prevent anaerobic sludge washout and recover part of the anaerobic sludge. The deodorized water flows into the anaerobic sedimentation tank and is mixed with the wastewater. The wastewater enters the AO-Anammox tank. In the O tank, ammonia nitrogen is oxidized to nitrite nitrogen and nitrate nitrogen. The nitrate nitrogen flows back to the A tank and is reduced to nitrogen by denitrifying bacteria. The nitrogen removal rate reaches 25%. The nitrite nitrogen and the remaining ammonia nitrogen in the AO tank enter the anaerobic ammonium oxidation reaction zone and are converted into nitrogen under the action of anaerobic ammonium oxidation bacteria. The nitrogen removal rate reaches 95%. Part of the sludge in the first sedimentation tank flows back to the A tank, and part of the sludge in the second sedimentation tank flows back to the anaerobic ammonium oxidation tank. PAC medicament is added to the final sedimentation tank for phosphorus removal, and stirring is carried out to accelerate coagulation. After precipitation, phosphorus is discharged in the form of sludge, and the phosphorus removal rate reaches 98%. The ozone reaction tank adopts ozone contact oxidation to remove the refractory substances in the wastewater and decolorize and deodorize. 80% of the water after treatment in the wastewater resource utilization unit is discharged into the municipal pipe network.

[0032] S3: 20% of the treated water enters the circulating deodorization unit as reclaimed water. The reclaimed water is stored in the reuse tank of the reclaimed water reuse workshop. The reclaimed water pump pumps the reclaimed water into the water storage tank in the deodorization room to supply water for the spraying device of the deodorization filter wall. The fan extracts the breeding exhaust gas through the deodorization filter wall. After being washed, it forms deodorized water, which is temporarily stored in the deodorization regulation tank and enters the anaerobic sedimentation tank of the wastewater resource utilization unit in S2, and the mixed breeding wastewater continues to be treated.

[0033] S4: The fecal residues separated by solid-liquid separation in the pretreatment unit and the sludge discharged from the primary sedimentation tank are stored in the pretreatment sludge tank and enter the dehydration workshop for dehydration using a spiral press. The sludge discharged from the UASB reactor, anaerobic sedimentation tank, AO-Anammox tank and final sedimentation tank in the wastewater resource utilization unit are stored in the biochemical sludge filtrate tank, concentrated in the sludge thickening tank and then enter the dehydration workshop for dehydration using a spiral press. The fecal residues and sludge are transported to the drying yard after dehydration, and crop straws and other agricultural crops are added to the composting area for composting, which is used for planting kumquats and other plants in the factory area.

[0034] The effluent concentrations after treatment are all lower than the limits specified in the "Pollutant Discharge Standard for Livestock and Poultry Breeding Industries" (GB / T 18596-2001): COD ≤ 400 mg / L, SS ≤ 200 mg / L, NH 3 -N ≤ 80 mg / L, TP ≤ 8 mg / L, fecal coliform count ≤ 1000 mg / L, Ascaris eggs ≤ 2 mg / L, odor concentration (dimensionless) ≤ 70.

[0035] Example 1:

[0036] A resource collaborative treatment system for the three wastes in large-scale livestock and poultry breeding, as Figure 1 、 Figure 2 shown, includes a pretreatment unit, a wastewater resource unit, a circulating deodorization unit, and a solid waste resource unit.

[0037] The pretreatment unit includes: a grille 11, a two-stage solid-liquid separator 12, an adjustment tank 13, and a primary sedimentation tank 14. The livestock and poultry breeding manure and sewage are intercepted by the large-volume floating objects by the grille 11, and the two-stage solid-liquid separator 12 performs solid-liquid separation. The generated wastewater is aerated and the water quality is adjusted in the adjustment tank 13, and coagulation precipitation is carried out in the primary sedimentation tank 14.

[0038] The wastewater resource unit includes: a UASB reactor 21, a gas holder 22, a biogas purification component 23, a boiler room 24, an anaerobic sedimentation tank 25, an AO-Anammox tank 26, a final sedimentation tank 27, and an ozone reaction tank 28.

[0039] The wastewater treated by the pretreatment unit enters the UASB reactor 21 to remove high-concentration organic matter.

[0040] As Figure 3 shown, the wastewater enters the UASB reactor 21 from the water inlet 214 through the water pump 213, is evenly distributed by the water distributor 218, the wastewater is diverted by the baffle 212 and flows out from the water outlet 216, the sludge is discharged from the sludge outlet 215, and the biogas passes through the three-phase separator 211 and is discharged from the gas outlet 217.

[0041] The gas holder 22 collects the generated biogas, performs dehydration and alkali washing in the biogas purification component 23, and then enters the boiler room 24 to be converted into heat energy. The heater 24 maintains the temperature of the UASB reactor. The wastewater continues to remove the suspended matter in the effluent of the UASB reactor in the anaerobic sedimentation tank 25, prevents anaerobic sludge from running away and recovers part of the anaerobic sludge, and mixes with the deodorized water.

[0042] The wastewater enters the AO-Anammox tank 26. As Figure 4 shown, the ammonia nitrogen in the O tank 262 is oxidized to nitrite and nitrate nitrogen, and the aeration device 2621 supplies oxygen. The nitrate nitrogen is refluxed to the A tank 261 and reduced to nitrogen gas. The nitrite nitrogen and the remaining ammonia nitrogen in the AO tank enter the anaerobic ammonia oxidation tank 264, and the wastewater contacts the anaerobic ammonia oxidation filler 2641 and reacts Ammonia nitrogen and nitrite are converted into nitrogen gas. Part of the sludge in the primary sedimentation tank 263 is refluxed to the A tank 261, and the remaining sludge is discharged. Part of the sludge in the secondary sedimentation tank 265 is refluxed to the anaerobic ammonium oxidation tank 264, and the remaining sludge is discharged.

[0043] Phosphorus is removed in the final sedimentation tank 27, and contact oxidation is carried out in the ozone reaction tank 28. 80% of the treated water is discharged into the municipal pipe network.

[0044] The circulating deodorization unit includes: the reclaimed water reuse tank 31, the reclaimed water pump 32, the exhaust fan 33, the reservoir 34, the deodorization filter wall 35, and the deodorization adjustment tank 36.

[0045] 20% of the water after the resource treatment of the wastewater enters the reclaimed water reuse tank 31 for storage. The reclaimed water pump 32 pumps the water into the reservoir 34 in the deodorization workshop to supply water for the spraying system of the deodorization filter wall 35. The breeding waste gas is collected by the exhaust fan 33 and passes through the deodorization filter wall. The waste gas dissolves in water to form deodorized water, and the water quality is adjusted in the deodorization adjustment tank 37 and then flows into the anaerobic sedimentation tank 24 of the wastewater resource unit for subsequent treatment.

[0046] The solid waste resource unit includes: the pretreatment sludge tank 41, the biochemical sludge filtrate tank 42, the sludge thickening tank 43, the screw press 44, and the drying yard 45.

[0047] The manure residue separated by the solid-liquid separator 12 in the pretreatment unit and the sludge discharged from the primary sedimentation tank 14 enter the pretreatment sludge tank 41 for storage. The sludge discharged from the UASB reactor 21, the anaerobic sedimentation tank 25, the AO - Anammox tank 26, and the final sedimentation tank 27 in the wastewater resource unit enter the biochemical sludge filtrate tank 42 for storage and are thickened in the sludge thickening tank 43. The manure residue and sludge are dehydrated by the screw press 44 in the dehydration workshop, and after dehydration, they are transported to the drying yard 45, and crop straws and other crops are added in the composting area for composting, which is used for planting kumquats and the like in the factory area.

[0048] Example 2:

[0049] The resource collaborative treatment method for the three wastes of large-scale livestock and poultry breeding provided by the embodiment of the present invention is adopted, as Figure 1 shown. A large-scale pig farm adopts the water flushing manure process, and the unit production of high-concentration wastewater is 2000m 3 / d, and 1250t / d of feces is produced. The water quality of the wastewater is as follows:

[0050] Index pH COD BOD Ammonia nitrogen Total nitrogen Total phosphorus Influent quality 6.5-8.5 ≤20000 ≤9000 ≤1350 ≤1500 ≤200

[0051] It includes the following steps:

[0052] (1) The livestock and poultry manure and sewage are pretreated, and large-volume floating objects are intercepted by the grille. The two-stage solid-liquid separator separates the feces and wastewater, and the separated wastewater enters the regulation tank for temporary storage to regulate the flow rate. The aeration volume is 0.5 - 0.8m3 / (m 3 ·h). Add about 5 mg / L of flocculant PAM, stir and then precipitate.

[0053] (2) The wastewater removes high-concentration organic matter in the UASB reactor, and the operating temperature is between 30 and 35 °C.

[0054] (3) After the biogas is collected, it is dehydrated and alkali-washed, and then converted into heat source through the on-site boiler room to heat the UASB reactor.

[0055] (4) The wastewater continues to remove the suspended solids in the effluent of the UASB reactor in the anaerobic sedimentation tank, preventing anaerobic sludge from running off and recovering part of the anaerobic sludge, and mixing deodorized water.

[0056] (5) The wastewater enters the AO-Anammox pool. The ammonia nitrogen in the O pool is oxidized to nitrite nitrogen and nitrate nitrogen, and the nitrate nitrogen is refluxed to the A pool and reduced to nitrogen gas. The nitrite nitrogen and the remaining ammonia nitrogen in the AO pool enter the anaerobic ammonia oxidation pool and are converted into nitrogen gas. Part of the sludge in the primary sedimentation tank is refluxed to the A pool, and part of the sludge in the secondary sedimentation tank is refluxed to the anaerobic ammonia oxidation pool.

[0057] (6) Add PAC medicament in the final sedimentation tank to remove phosphorus, stir to accelerate coagulation, and the phosphorus is discharged in the form of sludge after precipitation.

[0058] (7) The ozone reaction pool adopts ozone contact oxidation to remove the refractory substances in the wastewater and decolorize and deodorize. 80% of the water after treatment in the wastewater resource utilization unit is discharged into the municipal pipe network.

[0059] (8) 20% of the treated water enters the reuse pool in the circulating deodorization unit for storage. The recycled water pump pumps the water into the reservoir in the deodorization room. The fan collects the breeding waste gas through the deodorization filter wall, forms deodorized water after washing, is temporarily stored in the deodorization adjustment pool, enters the anaerobic sedimentation tank, and mixes with the breeding wastewater for continuous treatment.

[0060] (9) The manure residue separated by solid-liquid separation and the sludge discharged from the primary sedimentation tank enter the pretreatment sludge pool for storage; the sludge discharged from the UASB reactor, anaerobic sedimentation tank, AO-Anammox pool and final sedimentation tank enters the biochemical sludge filtrate pool for storage and is concentrated in the sludge thickening tank. The manure residue and sludge are dehydrated and transported to the drying yard, and crop straws and other agricultural crops are added to the composting area for composting, which is used for planting kumquats, etc.

[0061] The water quality of the wastewater after treatment in this embodiment is as follows: pH: 6.5 - 7.5; COD ≤ 300 mg / L; BOD ≤ 150 mg / L; SS ≤ 100 mg / L; ammonia nitrogen ≤ 35 mg / L; total nitrogen ≤ 40 mg / L; total phosphorus ≤ 4 mg / L.

[0062] The concentration of the treated waste gas is as follows: ammonia in the pig house ≤ 3 mg / m 3 ; hydrogen sulfide ≤ 1.2 mg / m3 。

[0063] The situation of the treated solid waste is as follows: the moisture content of the dehydrated sludge and manure residue is ≤ 65%, and the solid waste is reduced by about 750 t per day.

[0064] Judging from the treatment results, the treatment method provided in this embodiment has good treatment effects.

[0065] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A resource-based collaborative treatment system for waste from large-scale livestock and poultry farming, characterized in that: The system includes a pretreatment unit, a wastewater resource unit, a circulating deodorization unit and a solid waste resource unit; The pretreatment unit is used to separate the livestock and poultry manure into solid and liquid after removing large floating objects, and to transport the separated wastewater to the wastewater resource unit after coagulation and sedimentation, and to transport the separated manure and generated sludge to the solid waste resource unit; The wastewater resource recovery unit is used to sequentially remove high-concentration organic matter, denitrify, remove phosphorus and perform contact oxidation on the wastewater, then deliver 20% of the treated water to the circulating deodorization unit, discharge 80% of the treated water to the municipal pipe network, and deliver the generated sludge to the solid waste resource recovery unit; it also collects the generated biogas and purifies it for use; The circulating deodorization unit is used to store wastewater for reuse, and dissolve the aquaculture waste gas in water to form deodorized water, which is then returned to the wastewater resource utilization unit for reuse; The solid waste resource recovery unit is used to concentrate and dehydrate feces and sludge.

2. The resource-based collaborative treatment system for large-scale livestock and poultry breeding wastes according to claim 1 is characterized in that: The pretreatment unit comprises a grid, a two-stage solid-liquid classifier, a regulating tank and a primary sedimentation tank connected in sequence; The grille is used to intercept large floating objects in livestock and poultry manure; The two-stage solid-liquid classifier is used to separate the solid and liquid of livestock and poultry manure; The regulating tank is used to regulate the water quality and quantity of the wastewater, and the primary sedimentation tank is used to coagulate and precipitate the wastewater.

3. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes as claimed in claim 2 is characterized in that: The solid-liquid separator comprises a first-stage solid-liquid separator and a second-stage solid-liquid separator connected to each other; a stirrer is arranged in the primary sedimentation tank, and PAM agent is also added into the primary sedimentation tank to flocculate and precipitate particles in the wastewater under the action of the stirrer.

4. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes as claimed in claim 2 is characterized in that: The wastewater resource recovery unit comprises a UASB reactor, an anaerobic sedimentation tank, an AO-Anammox tank, a final sedimentation tank and an ozone reaction tank which are connected in sequence; The UASB reactor is used to remove high-concentration organic matter in wastewater; The anaerobic sedimentation tank is used to continue to remove suspended solids from the effluent of the UASB reactor, prevent anaerobic sludge from running out, recover part of the anaerobic sludge, and add the deodorized water into the wastewater; The AO-Anammox tank is used to denitrify wastewater; The final sedimentation tank is used to add PAC reagent to the wastewater to adsorb and complex sulfate ions to achieve the purpose of phosphorus removal; The ozone reaction tank is used to adopt ozone contact oxidation to degrade the hard-to-degrade organic matter, colloids and heavy metal substances in the wastewater on the one hand, and to achieve the purpose of decolorization and deodorization on the other hand.

5. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes as claimed in claim 4 is characterized in that: The AO-Anammox tank comprises an A tank, an O tank, a first sedimentation tank, an anaerobic ammonium oxidation tank and a second sedimentation tank which are connected in sequence, wherein the first sedimentation tank is also connected to the O tank, and the second sedimentation tank is also connected to the anaerobic ammonium oxidation tank; The A pool and the O pool are used to collaboratively perform preliminary denitrification of wastewater and provide substrates for anaerobic ammonium oxidation reactions; The first settling tank is used to settle the sludge produced in the O tank and return part of the sludge to the A tank; The anaerobic ammonium oxidation tank is used to remove ammonia nitrogen from wastewater; The secondary sedimentation tank is used to precipitate the sludge produced in the anaerobic ammonium oxidation tank, and return part of the sludge to the anaerobic ammonium oxidation tank.

6. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes according to claim 4 is characterized in that: The wastewater resource unit includes a gas cabinet, a biogas purification component and a boiler room which are connected in sequence, and the gas cabinet and the boiler room are also connected to the UASB reactor respectively; The gas cabinet is used to collect biogas generated by the UASB reactor; The biogas purification component is used to dehydrate and alkaline-wash the biogas before connecting it to the boiler room to provide heat for the plant area and the UASB reactor.

7. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes according to claim 4 is characterized in that: The circulating deodorization unit comprises a connected reclaimed water recycling workshop and a deodorization workshop, wherein the inlet end of the reclaimed water recycling workshop is connected to the ozone reaction tank, and the outlet end of the deodorization workshop is connected to the anaerobic sedimentation tank; Among them, the reclaimed water reuse workshop includes a reuse water pool and a reuse water pump connected in sequence, the deodorization workshop includes a fan, and a water storage tank, a deodorization filter wall and a deodorization regulating tank connected in sequence, and the inlet end of the water storage tank is connected to the outlet end of the reuse water pool through the reuse water pump.

8. The resource-recovery coordinated treatment system for large-scale livestock and poultry breeding wastes as claimed in claim 4 is characterized in that: The solid waste resource unit includes a pre-treatment sludge tank, a dewatering workshop and a drying yard, and a connected biochemical sludge filtrate tank and a sludge thickening tank; the pre-treatment sludge tank is respectively connected to the outlet ends of the two-stage solid-liquid classifier and the primary sedimentation tank; the sludge thickening tank is respectively connected to the outlet ends of the UASB reactor, the anaerobic sedimentation tank, the AO-Anammox tank and the final sedimentation tank, and the sludge thickening tank is also connected to the dewatering workshop; The pre-treatment sludge tank is used to store the feces residue after solid-liquid separation in the pre-treatment unit and the sludge discharged from the primary sedimentation tank; The biochemical sludge filtrate tank is used to collect and store the sludge discharged from the UASB reactor, the anaerobic sedimentation tank, the AO-Anammox tank and the final sedimentation tank of the wastewater resource utilization unit, and discharge it to the sludge thickening tank to concentrate the sludge; The dewatering workshop is used to dewater the excrement and sludge and transport them to the drying plant to be added to the crops in the composting area for composting.

9. A resource-based collaborative treatment method for three wastes from large-scale livestock and poultry breeding, characterized in that: The method is applied to a resource-based collaborative treatment system for three wastes from large-scale livestock and poultry breeding as described in any one of claims 1 to 8; the method comprises: S1: Solid-liquid separation of livestock and poultry manure, adding coagulant to the separated wastewater for coagulation and precipitation; S2: Remove high-concentration organic matter from wastewater, generate biogas and purify it for utilization, then remove nitrogen and phosphorus, and contact oxidation. After treatment, part of the water enters the deodorization process, and the other part of the water is discharged into the municipal sewage pipeline; S3: dissolving the waste gas in the treated water to form deodorized water, and returning the deodorized water to be mixed with the separated waste water and subsequently treated; S4: The separated feces and discharged sludge are concentrated and dehydrated in turn.

10. The resource-recovery collaborative treatment method for large-scale livestock and poultry breeding wastes according to claim 9, characterized in that: The method specifically includes: S1: The pretreatment unit separates the solid and liquid of livestock and poultry manure, and adds a coagulant to the separated wastewater for coagulation and precipitation; S2: After solid-liquid separation in the pretreatment unit, the wastewater is treated in the UASB reactor to remove high-concentration organic matter, generate biogas and purify it for utilization. The wastewater is denitrified in the AO-Anammox tank, dephosphorized by adding chemicals in the final sedimentation tank, and contact-oxidized in the ozone reaction tank. After treatment, 80% of the water is discharged into the municipal sewage pipeline. S3: 20% of the water treated in the wastewater resource recovery unit enters the circulating deodorization unit, is stored in the reclaimed water reuse workshop, and is pumped into the water storage tank in the deodorization room through the reuse water pump. The exhaust gas in the large-scale pig house is extracted by the fan and transmitted to the deodorization filter wall in the deodorization room. The deodorization filter wall is sprayed to dissolve the exhaust gas in water to form deodorized water. The deodorized water flows into the deodorization regulating tank for temporary storage, and then enters the sedimentation tank of the wastewater resource recovery unit and is mixed with the aquaculture wastewater for subsequent treatment; S4: The feces separated from the solid-liquid separation in the pretreatment unit and the sludge discharged from the primary sedimentation tank are stored in the pretreatment sludge tank and dehydrated by a screw stacker in the dewatering workshop; the sludge discharged from the UASB reactor, the anaerobic sedimentation tank, the AO-Anammox tank and the final sedimentation tank in the wastewater resource utilization unit is stored in the biochemical sludge filtrate tank, enters the sludge thickening tank for concentration, and is dehydrated by a screw stacker in the dewatering workshop; the feces and sludge are transported to the drying yard after dehydration, and plant straw and crop compost are added in the composting area for planting kumquats in the factory area.

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