Method for filtering, concentrating and recycling water drained from anaerobic fermentation pond of livestock and poultry farm

Abstract

The invention discloses a method for filtering, concentrating and recycling water drained from an anaerobic fermentation pond of a livestock and poultry farm. The method for filtering, concentrating and recycling the water drained from the anaerobic fermentation pond of the livestock and poultry farm includes the following steps: S1, gathering waste water generated after anaerobic fermentation is carried out on excrement and urine in the pig farm, wherein the excrement and the urine in the pig farm and washing water are mixed to enter the anaerobic fermentation pond, and the water drained after anaerobic fermentation is carried out is filtered through sand to be gathered to enter a waste water pond; dry distillation is carried out on left residues, and livestock excrement active carbon, livestock excrement carbon and fuel gas formed by carrying out splitting decomposition on livestock excrement mixtures are obtained after dry distillation is carried out; S2, carrying out dual coarse filtering, wherein the waste water in the waster water pond is pumped by a water pump through a pipe valve into a front coarse filter element and a back coarse filter element to be coarsely filtered; S3, carrying out carbon filtering and fine filtering, wherein the filter liquor obtained after dual coarse filtering flows into a carbon filter element and a fine filter element for carbon filtering and fine filtering; S4, carrying out ultra-filtering, wherein the filter liquor obtained after carbon filtering and fine filtering flows into an ultra-filtering device for ultra-filtering, and the filter liquor obtained after ultra-filtering flows into a middle water tank; S5, carrying out standing, and discharging liquid; S6, carrying out low-pressure and high-pressure nano-filtering; S7, carrying out back washing, wherein back washing water flows into the middle water tank.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of livestock and poultry breeding waste, in particular to a method for filtering, concentrating and recovering effluent from anaerobic fermentation tanks in livestock and poultry farms. Background technique [0002] The harmless treatment and resource utilization of livestock and poultry breeding waste is the development direction and inevitable trend of the treatment and utilization of livestock and poultry manure and other sewage. However, my country's livestock and poultry farms are mainly concentrated in rural areas, and there are problems such as single governance technology, backward processing mode, low resource utilization rate, and inability to take into account the comprehensive benefits of resources and the environment. In order to reduce the environmental pollution caused by livestock and poultry breeding, the state has formulated a more stringent "Discharge Standard of Wate...

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Problems solved by technology

[0005] After searching, there are many authorized patents related to the treatment of large-scale pig farm wastewater, such as a biogas slurry precision filtration device and filtration method (201110117871.8), a treatment method for livestock and poultry breeding polluted biogas slurry (201110211338.8), a biogas slurry A method for recycling components in the whole process (201210301484.4), a method for separating the active ingredients of biomedicine fertilizer from biogas slurry (200810061050.5), an ecological treatment device and method for biogas slurry from livestock and poultry breeding sewage (200810120398.7), biogas slurry precipitation, Aeration, filtration, proportioning, increasing water-soluble oxygen fertilization equipment (200910146927.5), etc. However, so far, there has been no use of multiple filtration devices, coupled assembly of ultrafiltration and nanofiltration membrane modules in series, for efficient treatment of intensive pig farm wastewater and Reports and patent applications for a set of methods and equipment for recycling and utilizing its effective nutrients, and the quality of effluent water can be directly discharged or reused for flushing fences

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