Method for improving efficiency of producing biogas through anaerobic fermentation by adopting energy grass

Abstract

The invention relates to a method for improving the efficiency of producing biogas through anaerobic fermentation by adopting energy grass. The method comprises the following steps: 1) freeze drying: cutting fresh energy grass until the length is 5-10cm, carrying out freeze drying on the energy grass in a freeze dryer for 60-80 hours, grinding the energy grass and sieving the ground energy grass with a 0.5-2mm sieve; 2) microwave treatment: mixing the energy grass with distilled water in a weight ratio of (1 to 25)-(1 to 35) and carrying out microwave pretreatment, wherein the microwave pretreatment process is divided into three stages, namely a heating stage, an insulation stage and a cooling stage. The pretreatment method provided by the invention has the advantages that the pretreatment method comprises freeze drying and microwave treatment and can achieve the effects of breaking anti-degradation barriers of cell walls of the energy grass and damaging a cross-linking structure of cellulose, hemicellulose and lignin in the cell walls, so that the specific surface area of the cellulose is increased and the accessibility is enhanced, thus being beneficial to adhesion of microorganisms and enzymes and degradation of the cellulose, increasing the methane yield and shortening the fermentation time.

Description

technical field [0001] The invention relates to the field of biomass energy, in particular to a method for improving the efficiency of biogas production by anaerobic fermentation of energy grass. Background technique [0002] With the shortage of fossil energy and the deterioration of the ecological environment, people pay more and more attention to biomass energy. The first generation of biomass fuel is mainly bioethanol produced from corn and sugarcane, but there is a problem of "competing with others for food and sugar" with corn and sugarcane as raw materials. Therefore, the second-generation biofuels based on lignocellulose are developing rapidly. [0003] Biogas is a kind of renewable energy with more development prospects in biomass energy. my country consumes a large amount of natural gas and has become the third largest natural gas consumer in the world. According to the statistics of China Petroleum Institute of Economics and Technology, my country's natural gas...

AI Technical Summary

Problems solved by technology

Chemical methods include acid treatment, alkali treatment, ionic liquid treatment, and oxidation treatment. Although the reaction speed is fast and the effect is good, it is easy to produce waste liquid and other substances and cause secondary pollution to the environment.

Biological methods such as microbial pretreatment, enzyme treatment, silage, etc., although the reaction conditions are mild, the energy consumption is small, and there is no pollution, the cycle is longer

Although the physical method does not have the problems of pollution and long reaction time, high temperature and high pressure, steam explosion, etc. consume a lot of energy and cost.

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