A high-efficiency straw fermentation method using straw silage to increase biogas production

Abstract

The invention relates to a high-efficiency straw fermentation method using straw silage to increase biogas production, which comprises the following steps: 1). Raw material processing: crushing freshly harvested green straw to form straw scraps; 2). Soaking the silage additive: soaking the straw Put the crushed material into the silage additive solution and soak for 30-120 minutes. The silage additive adopts a metal salt solution with a mass percentage concentration of 0.5%-20%. 3). Vacuum silage: put the soaked straw fragments and silage additive mixture into a sealed container, and the sealed container is evacuated by a vacuum pump to form an anaerobic environment, and stored in a vacuum airtight manner for 30-120 days to obtain silage straw; 4 ). Biogas production by anaerobic fermentation: the obtained silage straw is subjected to anaerobic fermentation, and the mass ratio of the anaerobic fermentation inoculum to the dry matter of the silage straw is 1:1‑50. The invention can effectively increase the amount of biogas produced by the straw, so as to finally realize resourceful utilization of the straw with high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of agricultural solid waste treatment and resource utilization, and is mainly applied to straw quality preservation and silage straw anaerobic fermentation to produce biogas, which is an efficient straw fermentation method that utilizes straw silage to increase biogas output. Background technique [0002] In my country, crop stalks are an important source of biomass energy. Except for some of them used as feed or directly burned for cooking by farmers, most of them are burned on site, which not only wastes resources but also pollutes the environment. Straw fermentation to produce biogas is an effective resource utilization method. However, the low efficiency of straw fermentation is mainly due to the complex structure of bioavailable components (cellulose, hemicellulose) inside the straw, and the barrier binding effect of lignin on cellulose and hemicellulose, which makes anaerobic microorganisms It is diff...

AI Technical Summary

Problems solved by technology

Fermentation inhibitors can reduce the pH value of silage, inhibit the growth and reproduction of harmful bacteria, prevent mildew and rot, and reduce the loss of nutrients. However, existing fermentation inhibitors such as hydrochloric acid and nitrate can inhibit the subsequent anaerobic fermentation microorganisms. Therefore, finding the silage fermentation inhibitor suitable for subsequent anaerobic fermentation to produce biogas, improving the efficiency of straw to produce biogas, and finally realizing the efficient and low-cost resource utilization of straw is the key problem to be solved.

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