Aerobiotic and anaerobic coupled two-phase fermentation marsh gas generation process method

Abstract

The invention discloses an aerobatic and anaerobic coupled two-phase fermentation marsh gas generation process method, and belongs to the renewable energy resource utilization technology. The method includes the three steps of distributing and mixing crop straw, conducting wet process aerobiotic hydrolysis fermentation and conducting wet process anaerobic marsh gas generation fermentation. In the wet process aerobiotic hydrolysis fermentation step, by means of rapid propagation of aerobiotic micro-organisms, lignin of the crop straw is degraded, the structure of the lignin is damaged, and therefore cellulose and hemicellulose which can be fully used in the subsequent wet process anaerobic marsh gas generation fermentation step can be exposed, and the marsh gas production rate can be increased. The advantages of aerobiotic fermentation and the advantages of anaerobic fermentation are brought into full play and fully used, no chemical reagent needs to be added, operation is easy and convenient, the process is simple, the marsh gas productivity is high, the comprehensive utilization effect of the crop straw is good, and the application range is wide.

Description

technical field [0001] The invention belongs to the field of renewable energy development and utilization and environmental protection, and specifically relates to a biogas production process technology of aerobic and anaerobic coupling two-phase fermentation. Background technique [0002] my country is a large agricultural country with abundant straw resources of various crops, with an annual output of about 79 million tons. Straw is a valuable renewable resource, containing 80% to 90% of organic matter, but the current utilization rate of straw is only about 33%, most of which are burned on the spot, which not only easily causes fire accidents, but also pollutes the environment and causes smog Weather is harmful to human health. [0003] Using straw as raw material to produce biogas by anaerobic fermentation is an effective way to utilize straw as energy. The main organic components in straw are cellulose and hemicellulose, followed by lignin and other soluble substances...

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Problems solved by technology

[0005] In the existing Biopercolat process, Linder KCA process, and APS process, aerobic or micro-aerobic hydrolytic acidification is also adopted, but the TS in the hydrolytic acidification process of these three processes is relatively high, and the dry method is used to hydrolyze the straw. The heat and mass transfer of dry fermentation is difficult, which hinders the penetration of microorganisms into the crude fiber, so that the microorganisms cannot effectively contact with the substrate, the degradation rate of crude fiber is slow and uneven, and the raw material of dry fermentation straw is difficult to feed in and out. Therefore, it is imperative to propose a new process method suitable for straw biogas fermentation to improve the utilization rate of straw biogas fermentation.

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