Ensiling method for improving yield of methane produced through anaerobic fermentation of straw

Abstract

The invention provides an ensiling method for improving the yield of methane produced through anaerobic fermentation of straw. The ensiling method comprises the following steps that the newly harvested straw is smashed into the length of 0.5-3.0 cm; an ensiling additive A is sprayed to the smashed straw, uniform stirring is conducted, and silage stock is obtained; the uniformly prepared silage stock is placed into a silage pit in layers; the method for filling the silage stock into each layer comprises the steps that each layer is filled with the straw with the thickness of 30-60 cm, the strawis compacted, and an ensiling additive B is uniformly sprayed on the upper surface of the straw; after filling of the silage stock is completed, sealing is conducted to form an anaerobic environment,closed storage is conducted for 30-90 days at the natural temperature of 5-25 DEG C, and ensiled straw is obtained, wherein the ensiling additive A is a calcium peroxide solution, and the ensiling additive B is an ammonium hydroxide solution. By means of the ensiling method, the straw can be prevented from being mildewed and decayed, loss of nutrients in the straw is reduced, and the yield of themethane produced through anaerobic fermentation of the straw is effectively improved.

Description

technical field [0001] The invention relates to the field of energy utilization of agricultural solid waste, in particular to a silage method for increasing the amount of biogas produced by anaerobic fermentation of straw. Background technique [0002] The annual output of crop straw in my country is 900 million tons, but the comprehensive utilization of straw is still in its infancy, the degree of industrialization is low, and the technical foundation is relatively weak. Except that some straws are used as feed, fertilizer returning to the fields, and domestic fuel, most of the straws are piled up or discarded at will, which not only wastes resources, but also pollutes the environment. The production of biogas from straw is an effective method for energy utilization of straw. However, the lignocellulosic straw is complex and stable. Without pretreatment, the cellulose and hemicellulose in the straw are difficult to be efficiently utilized by microorganisms. At present, the...

AI Technical Summary

Problems solved by technology

These existing methods mainly focus on destroying the stalk itself in the process of silage by adding fermentation promoters (such as lactic acid bacteria, cellulase, etc.), or fermentation inhibitors (such as acid, or acidic iron salts, etc.). However, the current silage method will lose too much organic components (soluble sugar, soluble protein, fat, etc.), and has limitations in destroying the complex lignocellulose structure in the straw.

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