Method for treating liquid dung in pig farms

Abstract

The invention discloses a method for treating liquid dung in pig farms. The method comprises several steps of sedimentation, pretreatment, oxidative decolorization post-treatment, coagulation treatment, lime slurry post-treatment, oxidation in an oxidation pond, and decolorization by an ultrafiltration membrane. Through adoption of the method, liquid dung of which the COD value is high and unstable, the organic matters are unstable, and the ammonia-nitrogen content is high can be effectively treated, the liquid dung can be decolorized deeply, and meanwhile, the biological colony count is prevented from increasing again. Therefore, the method is suitable for practical application.

Description

technical field [0001] The invention relates to a method for treating pig farm excrement and belongs to the technical field of environmental protection pollutant treatment. Background technique [0002] my country is the largest pig raising country in the world. Now the rapidly developing pig farming industry in China is developing towards intensive and large-scale development. While growing, it will also cause many problems. Large-scale pig farms have a large and concentrated amount of feces and sewage. Ten thousand pig farms produce more than 10 tons of pig manure and more than 100 tons of feces and sewage every day. These pollutants can easily pollute the surrounding water, soil and air, becoming a public nuisance to the nearby soil, air and even crops, and at the same time cause irreversible damage to groundwater. Pollution and a dirty environment can easily infect livestock and poultry with diseases, parasites and other diseases can also infect humans, the impact is very ...

AI Technical Summary

Problems solved by technology

However, these methods cannot achieve the purpose of effectively treating manure and achieving reasonable discharge standards. In particular, these biological processes have little effect in winter, and at the same time, the biological community cannot grow and reproduce in the manure treatment system with high ammonia nitrogen content.

In the patent CN102874957B (the method of treating pig farm manure by floccu

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