Treatment process of livestock and poultry breeding wastewater

Abstract

The patent relates to the field of wastewater treatment and specifically discloses a treatment process of livestock and poultry breeding wastewater. The method of the treatment process is simple in operation, the occupied area of every device is small, and all the devices are connected to form an integrated treatment device of the livestock and poultry breeding wastewater according to treatment processes of the livestock and poultry breeding wastewater; meanwhile, ammonia nitrogen in the livestock and poultry breeding wastewater can be recycled as a raw material of a nitrogen-containing product, and all solid waste and sludge at a biochemical section are made into an organic bio-fertilizer used as an ecological fertilizer of crops through harmless biological fermentation. According to thescheme, COD (chemical oxygen demand) in the livestock and poultry breeding wastewater can be recycled, and the livestock and poultry breeding wastewater is treated, so that the livestock and poultry breeding wastewater can reach a discharge standard.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment process for livestock and poultry breeding waste water. Background technique [0002] With the improvement of people's living standards, my country's livestock and poultry breeding industry has developed rapidly. The chemical oxygen demand discharged by the national livestock and poultry breeding industry reached 12.6826 million tons, accounting for 96% of the total agricultural source discharge; 38% and 56%. Livestock and poultry breeding wastewater has become the third largest source of pollution after industrial wastewater and domestic sewage. Therefore, how to deal with livestock and poultry breeding pollutants on a large scale has become an urgent problem to be solved. [0003] Livestock and poultry breeding wastewater has four characteristics: ① high COD, the COD concentration reaches: 5000-2000mg / L; ② high ammonia nitrogen, the concentration ...

AI Technical Summary

Problems solved by technology

There are roughly five aspects of its harm: ①Compared with traditional farmers' scattered breeding, large-scale breeding is conducive to improving the way of raising livestock and poultry, improving feeding efficiency and technology, epidemic prevention ability and management level, and greatly improving production efficiency and feed conversion rate , save feeding costs and increase economic benefits, but with the expansion of breeding scale, the amount of flushing water for livestock and poultry manure will increase, and the pollutant content in wastewater will be high. Insufficient treatment measures or improper use will cause harm to the environment

② Eutrophication of water body and soil pollution: The absorption and utilization rate of protein feed by livestock and poultry is low, and 50-70% of nitrogen and phosphorus in the feed are excreted with feces and urine, so the feces contain a large amount of nitrogen and phosphorus compound

According to statistics, at least 90 hectares of land are needed to consume the waste water produced by a pig farm with 10,000 live pigs. However, my country is a country with a large population and little land. The land-returning model for treating livestock and poultry waste water is very limited, and it is not properly treated. It will also cause the expansion of pollution sources

②The ecological treatment mode adopts artificial wetlands, stabilizing ponds, etc., and uses the joint action between microorganisms and plants to treat. This mode has many advantages, but its disadvantages are also obvious, such as large area, seasonal and temperature changes. The treatment effect has a great influence. If it is not treated properly, it will cause the release of pollutants and form new pollution.

Bioreactor treatment mode At present, no matter what method is used, which combination of several reactors, there are different problems, such as high cost, difficult control, etc., and anaerobic and aerobic in the face of livestock and poultry breeding wastewater The problems of the four major characteristics are relatively difficult. More importantly, livestock and poultry breeding wastewater is wastewater with a very low carbon-to-nitrogen ratio, which directly affects the nitrogen and phosphorus removal effect of biochemical treatment.

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