System and method for separating and treating pollutant sources of large-scale pig farm

Abstract

The invention discloses a system and a method for separating and treating the pollutant sources of a large-scale pig farm. The system comprises a pollutant source separation hog house, an excrement conveying device, an excrement fermenting device, a liquid conveying device, a fecaluria liquid fermenting device, a fence washing water SBR reactor and an ecological wetland, wherein the pollutant source separation hog house adopts the structure that short beams running through the whole hog house in the length direction are established in a hogcote, transverse beams and longitudinal beams are established between the short beams, a slatted floor is paved on the transverse beams and the longitudinal beams, every two short beams and a V-shaped bottom surface form a U-shaped excrement groove, the higher ends of the U-shaped excrement grooves are connected to an excrement collection pool, the lower ends of the U-shaped excrement grooves are connected to a liquid collection pool, and an excrement scrapping system is arranged in each U-shaped excrement groove. The separation of fecaluria from rainwater, drinking residual water and fence washing water and the separation of excrement from fecaluria liquid in advance are realized, so that the problem of difficult solid-liquid separation in subsequent procedures is solved, and the resource utilization and pollution treatment effect is good.

Description

Technical field [0001] The invention relates to a system and method for the separation and treatment of pollutants in a large-scale pig farm, belonging to the technical field of pollution treatment in a large-scale livestock and poultry farm. Background technique [0002] While the pig industry is developing rapidly towards intensive and large-scale, it is also facing the collection and treatment problems caused by a large amount of manure and sewage. [0003] At present, the methods of cleaning manure commonly used in large-scale pig farms at home and abroad mainly include blister manure, water flushing manure and dry manure cleaning methods. At present, the common method is blister manure cleaning method, that is, pig manure, flushing water and drinking. The remaining water is discharged into the manure ditch under the crevice floor. After the manure ditch is filled, the gate is opened and the manure is discharged through the main sewage ditch. The discharged manure is generally ...

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Problems solved by technology

[0003] At present, the manure cleaning methods commonly used in large-scale pig farms at home and abroad mainly include water soaking manure, water flushing manure and dry manure cleaning process. The remaining water is discharged into the manure ditch under the gap floor. After the manure ditch is full, the gate is opened, and the manure is discharged through the sewage main ditch. Solid-liquid separation, solid composting and fermentation to produce organic fertilizers, and liquids are treated in accordance with the urban domestic sewage treatment process and the pollutant discharge standards for livestock and poultry breeding (GB18596-2001), trying to "discharge up to standard". The disadvantages are: (1) Toxic and harmful gases endanger the health of pigs. The feces stay in the pig house for a long time, and part of the anaerobic fermentation in the manure ditch produces a large amount of harmful gases such as ammonia, hydrogen sulfide, and methane, which makes the pigs Decreased appetite, endangering the health of pigs; (2) High energy consumption, in order to reduce the harm of toxic and harmful gases to pigs’ health, people are forced to solve the problem of poisonous gas pollution by forced ventilation with high energy consumption, but in winter, forced Ventilation makes the pig house unable to keep warm, and the pigs are susceptible to infectious diseases such as influenza. At the same time, a large amount of toxic and harmful gases pollute the environment and endanger the health of the breeders; (3) The excrement is mixed with the flushing water and drinking water, increasing the excrement resources Difficulty in chemical utilization and manure treatment, because the nutrients in the biogas residue are dissolved in the biogas slurry, it is difficult to meet the standards for organic fertilizer nutrients made from biogas residues, and it is difficult to meet the discharge standards due to the high concentration of COD and ammonia nitrogen in the biogas slurry

[0004] The way of cleaning manure by water is to wash the pens with water every day, and the flushing water mixed with feces and urine flows into the manure ditch in the house. A flusher is installed at one end of the manure ditch, and the flusher is used to flush the manure ditch several times a day. The manure in the manure ditch is flushed into the main sewage ditch, and then discharged through the main sewage ditch for manure treatment. The discharged manure is generally treated by the following methods: first perform biogas anaerobic fermentation, then separate solid-liquid, and solid compost fermentation The organic fertilizer is produced, and the liquid is treated in accordance with the urban domestic sewage treatment process and the pollutant discharge standard for livestock and poultry breeding (GB18596-2001), trying to "discharge up to the standard". The disadvantages of this cleaning and treatment method are: (1 ) Large water consumption, serious waste of water resources; (2) After solid-liquid separation, the nutrient content in the dry matter is low, and the value of the organic fertilizer produced is reduced; (3) The amount of sewage is large, and the excrement is mixed with flushing water and drinking water Mixing will increase the difficulty of resource utilization of feces and urine and the treatment of manure, and it is difficult to achieve discharge standards

[0005] The dry manure method, that is, the manure is diverted once it is produced, the dry manure is collected and transported away by machinery or manually, and the urine and flushing water flow out from the sewer. Generally, the following methods are used for follow-up treatment: dry manure is composted and fermented to obtain organic fertilizers , the liquid is treated in an environmentally friendly manner according to the urban domestic sewage treatment process and the pollutant discharge standard for livestock and poultry breeding (GB18596-2001), trying to "discharge up to the standard". The disadvantages of this cleaning and treatment method are: (1) Manual cleaning of manure The labor load is heavy, the working environment is poor, the productivity is low, and the cost of manure cleaning is high. The manure cleaners and pigs are prone to cross-infection and epidemic diseases; A large amount of urine and some feces lead to high concentrations of COD and ammonia nitrogen in the flushing water, making it difficult to achieve discharge standards

[0006] In short, the disadvantages of these methods of manure cleaning and manure treatment are that the flushing water, drinking water and manure are mixed, which brings about the problem of increasing the amount and difficulty of sewage treatment; and the liquid is rich in organic matter and nitrogen. The concentrations of phosphorus and potassium, COD and ammonia nitrogen are high, and it is difficult for common sewage treatment technologies to make them meet the discharge standards. mg / L and total phosphorus 8 mg / L, which are respectively 8 times, 16 times and 16 times the limit value in the urban sewage treatment plant pollutant discharge standard (GB18918-2002, first-class A standard), the so-called "standard discharge "In fact, it is the root cause of eutrophication in water bodies, and the "standard discharge" sewage continues to pollute the environment

[0007] Chinese patent CN 105993973 A discloses a large-scale pig farm pollutant source separation system and method. The method is to set an inverted splayed slope and an inclined dung cleaning ditch under the slatted floor, and set a scraper in the dung cleaning ditch. The feces system, by regularly cleaning the excrement and urine in the ditch, realizes the separation of feces and urine from the flushing water. The disadvantage is that the depth of the excrement cleaning structure composed of the inverted splayed slope and the inclined ditch is large, and the strength of the slatted floor bearing beam The requirements are high, resulting in high cost of infrastructure; there may be feces accumulation on the inverted splayed slope, which affects the effect of manure cleaning; feces and urine are mixed together, and solid-liquid separation treatment is required, which greatly reduces the amount of solids separated from solid-liquid, and The nutrient content is low, the fertilizer value is reduced, and the patent does not cover the treatment method of manure

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