Method for preparing biogas from mixed plant straws and tanning sludge by dry-type anaerobic fermentation

Abstract

The invention provides a method for preparing biogas from mixed plant straws and tanning sludge by dry-type anaerobic fermentation, which comprises the following steps: adding white-rot fungus into anaerobic sludge of a brewery to prepare basic fermentation sludge, and fermenting at ordinary temperature for 8 hours; and mixing the basic fermentation sludge, straws, tanning sludge and water to form a fermentation substrate; and evenly mixing the fermentation substrate, putting the fermentation substrate into an intermittent anaerobic fermentation device, carrying out anaerobic dry-type fermentation at ordinary temperature, and finally, collecting the biogas by a draining gas-collection method.

Description

technical field [0001] The invention relates to a development technology of biomass energy, in particular to a method for preparing biogas by mixed dry anaerobic fermentation of plant straw and tanning sludge. Background technique [0002] As a large agricultural country, my country's annual output of crop straw has increased year by year with the increase of grain production. At present, my country's annual straw output is about 700 million tons. Traditionally, people often directly incinerate or randomly pile up a large amount of surplus straw, which causes a large number of social, economic and ecological problems such as air pollution, fire accidents, and traffic jams. With the continuous development of science and technology, people pay more and more attention to the development of new energy sources, and the potential biomass energy in straw has attracted widespread attention. [0003] Crop straw is mainly composed of cellulose, hemicellulose and lignin. Straw dry an...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing biogas by mixed dry anaerobic fermentation of plant straw and tannery sludge, making full use of the rich carbon source of plant straw and the rich nitrogen source in tannery sludge, two The latter carries out mixed dry anaerobic fermentation, adding tannery sludge to straw to form a fermentation substrate, which solves the problem of adding nitrogen source when straw is fermented alone, and at the same time denitrifies the tannery sludge

Straw is used as biomass energy to produce biogas through dry anaerobic fermentation, which solves the ecological and environmental problems caused by random discarding of straw and realizes the clean production of straw

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