Aerobic and anaerobic serial pretreatment method for corn straw microorganisms

Abstract

The invention relates to an aerobic and anaerobic serial pretreatment method for corn straw microorganisms. The method comprises the following steps: cleaning harvested fresh corn straw, chopping and adjusting the humidity; filling into a special airtight facility and compacting; covering with a plastic film for treating for about 30 days; performing aerobic and anaerobic combined pretreatment on the straw by using oxygen and florae carried by the straw, wherein the treated straw is applied to biogas fermentation. The method belongs to the field of waste recycling. The harvested corn straw is directly smashed, sealed and filled, so that fire resistance, rain prevention and mold prevention of marsh gas engineering raw materials are realized during storage and the problems of large occupation area and high potential safety hazard due to direct storage are solved; microorganism aerobic and anaerobic serial pretreatment is performed automatically in the sealed facility by using the air and oxygen and florae carried by the corn straw, so that the problems of high pretreatment cost and complexity in operation are solved; compared with untreated straw, the anaerobic digestion biogas production rate of the corn straw treated by using the method is increased by 20 percent, and the gas production rate is increased by 15 percent.

Description

technical field [0001] The invention relates to a method for pretreatment of corn stalks. Specifically, by cleaning, chopping, adjusting humidity and sealing treatment of corn stalks, the oxygen and bacterial flora carried by the corn stalks are used to carry out microbial aerobic and anaerobic series pretreatment, A pretreatment method for realizing effective storage of corn stalks and high-efficiency anaerobic digestion and gas production belongs to the field of resource utilization of waste. Background technique [0002] Straw anaerobic digestion technology can achieve multiple effects such as energy recovery, material recycling, environmental protection and promotion of farmers' income. It is one of the important utilization methods of crop straw in my country and has gradually received attention and support from the Chinese government. The main components of corn straw are cellulose, hemicellulose and lignin, accounting for 80% of the total straw. Cellulose and hemicel...

AI Technical Summary

Problems solved by technology

Physical methods include mechanical crushing, ultrasonic treatment, puffing treatment, microwave treatment, steam explosion, etc. The purpose is mainly to increase the contact area between anaerobic microorganisms and the substrate, or to make the treated straw easier to digest by destroying the cell wall structure. Simple, short processing time, but high energy consumption

Chemical methods mainly include ammonification, alkalization, acidification, etc., which can change the chemical composition, structure and physical properties of straw. After treatment, the efficiency of anaerobic digestion of straw is high, but the operation is complicated and easy to cause secondary pollution.

The biological method is to use microorganisms with strong lignocellulose decomposition ability to biodegrade straw and destroy the connection between cellulose-lignin-hemicellulose. It has the advantages of mild treatment conditions, no environmental pollution, and good treatment effects. The cultivation of microbial flora and the preparation of bacterial agents are complicated and require high environmental requirements

The above methods all have problems such as high processing cost and difficulty in engineering popularization and application.