Application method of biogas slurry in methane produced by anaerobic fermentation of rice straw

Abstract

The invention belongs to the technical field of biomass new energy, and discloses an application method of biogas slurry in methane produced by anaerobic fermentation of rice straw. The method comprises the following steps: preparing an anaerobic fermentation substrate; fully mixing the fermentation substrate with the paddy field soil extract in an anaerobic reactor; preparing and adding a microbial agent; sealing and connecting the reactor: sealing the reactor; and then connecting a gas inlet pipe of a gas collecting device with a gas outlet pipe of the reactor, periodically observing the gascollecting state of the gas collecting device, and measuring gas volume and methane content in time. By using the microbial agent, the anaerobic fermentation process of the rice straw can be accelerated, and the yield of the biological methane is remarkably increased; and the problems of long production period and low yield in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of new biomass energy, and in particular relates to a method for applying biogas slurry in anaerobic fermentation of rice straw to produce biomethane. Specifically, it is a new technology for converting straw organic matter into biomethane through the improvement of reaction conditions and catalytic action of microbial agents in the field. Background technique [0002] Currently, the closest prior art: [0003] China is the main producer of rice, and the annual output of rice straw reaches 1.752×10 8 t. The harmless treatment of rice straw and breeding waste is the core issue of rural ecological environment protection in my country. Due to the high transportation cost of straw, low nutrient content and the production of greenhouse gases, the application of rice straw in biomass power generation, bio-feed and straw returning to the field has been limited. The method of producing biomethane through anaerob...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing straw utilization method does not have the technical characteristics of anaerobic fermentation of straw in the field to produce methane, and cannot realize the harmless disposal of rice straw, resulting in poor improvement of farmland soil, and cannot effectively prevent and control the occurrence of diseases and insect pests

Moreover, it is not possible to efficiently use rice straw to ferment and produce biomethane in the field to improve production efficiency.

[0006] (2) Due to the complex reaction process of straw anaerobic fermentation to produce methane, including straw hydrolysis and acidification, hydrogen production, acetic acid production and methane production, each stage has a unique microbial community participating, and different stages require different acid-base conditions. There are interactions between microbial communities, which makes the existing technology have the problems of long production cycle and low conversion rate

[0008] The methane production process of straw anaerobic fermentation is often carried out simultaneously in multiple reaction stages, which requires the participation of various microorganisms, especially methanogenic microorganisms. However, the existing reaction system only contains some relevant microbial species in paddy soil, which cannot meet the needs of the reaction process. , making the whole reaction process longer and the yield lower

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