Technique for preparing biogas by high-temperature anaerobic zymosis method using animal manure as raw material

Abstract

The present invention relates to a technique which utilizes animal and poultry feces as material to prepare biogas underground by anaerobic fermentation, which belongs to the technical field of environment-friendly energy. The technique utilizes the cheap animal and poultry feces as material, in which liquid dung or active sludge perennially accumulated in a farm is added when fermentation is started; high temperature can ensure good growth, thus increasing fermentation efficiency; by a high temperature of 58 DEG C plus or minus 1 DEG C and 8 to 30 grades of anaerobic fermentation, the degradation period of feces and sludge can be shortened; harmful bacteria can be thoroughly sterilized in order to ensure harmlessness; moreover, the post-fermentation biogas residue and biogas slurry can be used as high-quality organic manure; and the produced residual heat can be used for fermentation heat supply or factory heat preservation and heating.

Description

technical field [0001] The invention belongs to the technical field of environmental protection energy, and relates to a process method for preparing biogas by anaerobic fermentation, in particular to a process method for preparing biogas by anaerobic fermentation using livestock and poultry manure as raw materials. Background technique [0002] In recent years, my country's aquaculture industry has rapidly developed from courtyard breeding to intensification, scale, and commercialization. Especially around large and medium-sized cities, there are more and more livestock and poultry farms, and the scale is getting larger and larger. According to incomplete statistics , my country's large and medium-sized livestock and poultry farms have reached more than 26,000, and the total amount of excrement in the year exceeds more than 3 billion tons. [0003] At present, the treatment of manure is diversified, including composting fermentation, composting, direct drying and granulation...

AI Technical Summary

Problems solved by technology

But it can't solve the fundamental problem, and can't realize the utilization of industrialized resources. The traditional feces treatment method brings many problems: (1) requires a large area of ​​storage yard; (2) requires a long time of natural aerobic fermentation; (3) smelly The air is soaring, the breeding of mosquitoes and flies pollutes the air, which seriously affects the epidemic prevention of farms; (4) the dung drips and flows, which seriously pollutes the surrounding environment; (5) increases the round-trip transportation of feces, which affects economic benefits; high-quality organic fertilizer, but the traditional treatment method makes it difficult to popularize the composting mechanical spreading technology and does not meet the needs of agricultural modernization

[0005] At present, less than 15% of manure is treated by anaerobic fermentation, and methods such as heating and drying manure and microwave drying are used. Because of their high energy consumption and poor complementary effects of single development and utilization, the promotion is limited. Hundreds of thousands of tons of fecal sewage, so measures must be taken without delay to solve the problems of livestock and poultry manure discharge and environmental pollution