Method for producing methane by dry fermentation of beast and bird wastes and crop straws

Abstract

The invention discloses a method for producing methane by dry fermentation of beast and bird wastes and crop straws. According to the method, solid beast and bird excrements with the dry material concentration of higher than 15% and crop straws which is subjected to pre-treatment are mixed according to a certain ratio and introduced to an anaerobic dry fermenting device together with naturalized active mud; a small deal of biogas slurry is recovered as inoculums, and fermentation residues are subjected to secondary compost to produce organic fertilizer. The method has the following advantages of high gas generation speed and high fermentation efficiency; the methane content is up to 50-65% which can meet the using demands of power generation and diary gas appliances; the produced organic fertilizer is unlikely to cause ammonia poison; eggs are killed completely; and the nitrogen fertilizer loss is low.

Description

technical field [0001] The invention relates to a method for producing biogas and organic fertilizer by dry fermentation of livestock and poultry manure and crop straw, which belongs to the field of solid waste treatment and biogas engineering in environmental engineering, and is mainly used for the comprehensive utilization of solid manure and crop straw in large-scale livestock and poultry farms . Background technique [0002] Dry anaerobic fermentation usually refers to the biogas fermentation method when the total solid concentration of the fermentation broth exceeds 15%. Compared with wet anaerobic fermentation, dry anaerobic fermentation technology is simple to operate, saves water, has low cost, and has high tank capacity efficiency. It will not cause secondary pollution discharge and treatment problems while obtaining biogas. Compared with dry fermented fertilizer, the nutrient loss is small, and it is a promising technical approach. my country has abundant biomass...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for producing biogas and organic fertilizer by dry fermentation of livestock and poultry manure and crop stalks, and a method for realizing energy and material recycling, aiming at solving the problem of large-scale livestock and poultry breeding and crop stalks being no longer mainly used as household fuel. The main source of environmental pollution is likely to cause huge pressure on the ecological environment. At the same time, the traditional anaerobic fermentation of livestock and poultry manure to produce biogas is greatly affected by the seasons. , Poor odor control, long composting time, incomplete killing of pathogenic bacteria and insect eggs in waste, affecting the quality of organic fertilizer products

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