A method and device for preparing biogas by three-stage co-fermentation of straw and manure

Abstract

The invention discloses a device for preparing biogas by three-stage co-fermentation of straw and manure, which comprises an open and closed aerobic hydrolysis leaching tank, a liquid acidification tank, an anaerobic fermentation tank, an aerobic composting device, and livestock and poultry manure Collection pond, lime water pond, high solute liquid collection pond, hydrogen sulfide gas absorber, ammonia gas absorber and system automatic control cabinet; the invention also discloses a method for preparing biogas by three-stage co-fermentation of straw and manure, including Three consecutive co-fermentation processes of aerobic hydrolysis of straw manure, rapid acidification of high solute liquid and high buffer anaerobic fermentation. The invention provides a three-stage biogas fermentation method and supporting equipment for co-producing fertilizer and gas with refractory straw combined with high-nitrogen perishable livestock and poultry manure, by improving the hydrolysis conversion efficiency of straw and reducing the inhibition of anaerobic fermentation process To improve the efficiency of anaerobic fermentation, realize efficient recycling of resources, and reduce the pollution load of biogas slurry.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of agricultural science and environmental science, and in particular relates to a method for preparing biogas by three-stage co-fermentation of straw and manure and a device matching the method. Background technique [0002] Energy is the foundation of social and economic development, and it is also an important factor that affects the steady development of social economy and promotes human progress. In recent years, with the rapid development of science and technology, the pace of urban industrialization has accelerated, and traditional agriculture has transformed into fossil agriculture, intensive cultivation and scale. cultured farming. The development of the large-scale livestock and poultry breeding industry has deviated from the track of the combination of traditional agriculture and breeding, resulting in the failure of the livestock and poultry manure produced in the breeding proces...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies and problems in the existing technology, the biogas monomer tank has the basic condition that the straw lacks aerobic hydrolysis, which leads to the slow hydrolysis rate and low degree of hydrolysis of the straw, and a large amount of straw remains in the biogas residue, occupying the effective volume of the biogas tank, resulting in the overall Insufficient residence time; high-temperature acidification speed is fast and it is easy to cause serious problems that the bacteria in the gas production stage are affected by acid inhibition, ammonia inhibition and the destruction of the balance of mineral elements

Images