Method for treating livestock and poultry breeding waste water

Abstract

The invention provides a method for treating livestock and poultry breeding waste water. The method mainly comprises the following steps of solid-liquid separation treatment, efficient nitrogen-phosphorus biochemical circulation treatment, modified oxidation ditch treatment, sludge reflux treatment, filtration and sterilization treatment and the like. The invention aims to provide the method for treating the livestock and poultry breeding waste water, which is high in capability of removing ammonia nitrogen, total nitrogen and total phosphorus and low in investment cost and running cost, and is easier to manage. The waste water treated by adopting the method provided by the invention can meet the requirement of the national Discharge standard of water pollutants for livestock and poultry breeding GB18596-2001; not only can the up-to-standard discharge requirement in the waste water treatment of the livestock and poultry breeding industry be effectively met, but also the difficult problem of removing the ammonia nitrogen while an organic matter is degraded is also solved; and the method is suitable for the waste water treatment of breeding farms on different breeding scales, similarly, is also suitable for the treatment of municipal domestic waste water and waste water with a high COD (chemical oxygen demand) or high ammonia nitrogen characteristic, and is wide in application prospect.

Description

technical field [0001] The invention relates to a method for treating livestock and poultry breeding sewage. Background technique [0002] According to relevant literature reports, the former State Environmental Protection Administration conducted a sample survey on the pollution status of large-scale livestock and poultry farming in 23 provinces (regions) and cities across the country, and found that the production of livestock and poultry manure and sewage in the country exceeded 20 billion tons, which is industrial solid waste. The chemical oxygen demand (COD) of livestock and poultry manure far exceeds the sum of the COD discharge of industrial wastewater and domestic sewage in my country. Livestock and poultry breeding pollution has become the third largest pollution source after industrial pollution and domestic pollution, and has become one of the main causes of agricultural surface pollution in my country. High-concentration sewage is discharged into rivers and lakes...

AI Technical Summary

Problems solved by technology

Nitrification and denitrification are two opposing processes. Nitrification is carried out under anaerobic environment with the help of nitrifying bacteria; denitrification needs to be carried out under anaerobic conditions with the help of denitrifying bacteria; The traditional biological denitrification process requires a large amount of organic carbon sources as electron donors. If C / N<2.5, denitrification cannot be carried out effectively without an external organic carbon source, and if C / N<4, the volume of the denitrification container needs to be Increased by 1.5-1.7 times; therefore, the traditional biological denitrification process shows great limitations when dealing with ultra-low C / N ratio high-concentration nitrogen-containing wastewater such as aquaculture wastewater

[0004] Due to the low operating load of the traditional process, it is difficult for the effluent CODcr to meet the discharge requirements of the new standard; the ability to remove ammonia nitrogen, total nitrogen, and total phosphorus is also low; and due to high investment costs and high operating costs, operation management is difficult and the burden on enterprises is heavy.

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