Method for treating anaerobic digestion solution for livestock breeding

Abstract

The invention discloses a method for treating anaerobic digestion solution for livestock breeding. The method for treating anaerobic digestion solution for livestock breeding comprises the steps of coagulating sedimentation pretreatment, filtering pretreatment and aquatic-plant ecological treatment. Due to the fact that anaerobic digestion solution ingredients of livestock and poultry feces have certain complexity and larger variability, a reasonable coagulating sedimentation process is determined, temperature, a PH value and stirring parameters are optimized, meanwhile an appropriate dosage of coagulating agent having appropriate components is added, the colloidal substance of a system is effectively adsorbed under the condition that SS is removed by the coagulating agent, and the COD removal effect is removed. The treatment load of a follow-up treatment unit is effectively reduced, staged adsorption is achieved in the mode that physical adsorption and biological adsorption are combined, and the effect of removing COD, phosphate and ammonia nitrogen is effectively achieved through reasonable aquatic-plant ecological treatment.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for treating anaerobic digestion liquid in livestock and poultry breeding. Background technique [0002] With the adjustment of the agricultural industrial structure and the development of new rural construction, the intensive and large-scale livestock and poultry breeding industry has developed rapidly, resulting in a large amount of livestock and poultry excrement, sewage and other waste. According to statistics, the annual discharge of livestock and poultry manure in 2000 has exceeded 2.7 billion tons, which is equivalent to 3.4 times the annual discharge of industrial waste. Livestock and poultry farming waste has become the main source of rural non-point source pollution in my country. [0003] The anaerobic treatment method can not only remove a large amount of soluble organic matter in the high-concentration organic wastewater of livestock and poultry farms, but a...

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Problems solved by technology

Due to the large amount of biogas slurry produced by large and medium-sized biogas projects in my country, the storage and transportation facilities of oxygen digested solution are not perfect; the management of farmland in my country is scattered, and the land area owned by farmers is small, so that the return of biogas slurry to the field cannot be widely implemented, and direct discharge will cause environmental pollution

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