Treatment method of biogas slurry polluted by livestock and poultry breeding

Abstract

The invention discloses a method for treating biogas slurry contaminated by livestock and poultry breeding. It adopts the traditional pig-biogas-fish treatment mode of biogas slurry, and uses Bacillus preparation FB-1, photosynthetic bacteria preparation FP-1, lactic acid bacteria preparation FL-2, Five kinds of microbial preparations including nitrifying bacteria preparation FN-1 and denitrifying bacteria preparation FD-1, mycelium FC-2 of actinomycetes as microbial adsorbent and filter-feeding fish to strengthen the treatment of biogas slurry to improve the treatment effect, Improve conversion efficiency and realize resource utilization of biogas slurry nutrition. This method has low investment and operating costs, simple operation, good treatment effect, wide application range, and easy popularization in underdeveloped rural areas.

Description

1. Technical field [0001] The invention relates to sewage treatment technology, in particular to a treatment method for biogas slurry polluted by livestock and poultry breeding. 2. Background technology [0002] In recent years, biogas projects have grown rapidly in rural areas, and the pollution of biogas slurry has become increasingly prominent. The pollution of biogas slurry is mainly manifested in the following aspects: First, the biogas slurry contains heavy metals, such as As, Hg, Cr, Cd, Pb, etc., especially the pollution of As is serious, and its untreated discharge will pollute the surrounding water bodies Second, the biogas slurry has the characteristics of high N and high COD, and the pollution load is large. If it is directly discharged without effective treatment, it will cause serious environmental pollution. Third, the biogas slurry is usually black and smelly, which not only pollutes the air, but also easily causes The growth of germs threatens the health of...

AI Technical Summary

Problems solved by technology

The pollution of biogas slurry is mainly manifested in the following aspects: First, the biogas slurry contains heavy metals, such as As, Hg, Cr, Cd, Pb, etc., especially the pollution of As is serious, and its untreated discharge will pollute the surrounding water bodies Second, the biogas slurry has the characteristics of high N and high COD, and the pollution load is large. If it is directly discharged without effective treatment, it will cause serious environmental pollution. Third, the biogas slurry is usually black and smelly, which not only pollutes the air, but also easily causes The growth of germs threatens the health of residents

[0003] In order to solve the pollution problem of biogas slurry, there are usually the following three ideas in the treatment of biogas slurry: (1) Use a method similar to urban domestic sewage treatment to build a sewage treatment plant for treatment; this kind of method has a large one-time investment, It is difficult to promote in most underdeveloped rural areas in my country due to problems such as complicated operation

(2) From the perspective of waste resource utilization, biogas slurry is used as organic fertilizer or water for farmland irrigation; compared with the first method, this method has many advantages of low investment, simple operation, and resource utilization at the same time. However, this type of technology still stays in the traditional pig-marsh-vegetable, pig-marsh-fish mode, the treatment efficiency is low, and a large land area is required; in addition, this method does not deal with heavy metals, which have a negative impact on the environment. pollution still exists

(3) CN101343134A discloses an ecological treatment device and method for biogas slurry contaminated by livestock and poultry breeding. It uses a percolation tank combined with an adsorption floating bed to process the biogas slurry. Although it has a good treatment effect, the treatment method has a large one-time investment. , operation and maintenance require certain professionals, and it is difficult to popularize in rural areas

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