Pure stalk fermentation biogas preparation process and apparatus based on composite strain degradation

Abstract

The invention relates to a technique for preparing methane through straw stalks fermentation only based on multi-microorganism degradation, which comprises the following steps: A. physical and biologic comprehensive pretreatment is carried out on biomass straw stalk raw materials; B. the biomass straw stalk raw materials which are comprehensively pretreated are thoroughly degraded and thrown into an anaerobic fermentation reactor together with fermentation inoculation strains for anaerobic reaction and methane preparation; C. the output methane of the step B is desulfurized, enters into a gas-storing device and is delivered to users through a transmission pipeline network; D. methane residues and methane liquid of the step B after the anaerobic reaction are discharged, the methane residues can be used as solid organic fertilizer through physical separation, and the methane liquid refluxes to the anaerobic fermentation reactor for reutilization. The invention also discloses a device for preparing the methane through straw stalks fermentation only based on multi-microorganism degradation. The time of traditional technique for straw stalks pretreatment is 10-15 days; however, the time of the technique for straw stalks pretreatment is only 5 days and the degradation efficiency of the technique is 1.3-1.5 times as high as that of the traditional technique.

Description

technical field [0001] The invention relates to a technique for producing biogas from biomass, in particular to a process and a gas production device for producing biogas by fermenting pure straw based on the degradation of composite strains. Background technique [0002] At present, my country is the largest agricultural producer in the world, producing 600-700 million tons of various crop straws every year, and its utilization rate is about 33%, of which only 2.6% are used after technical treatment. A large amount of straw is not used, which not only wastes resources, but also causes serious air pollution, fires and affects the operation safety of highways and civil aviation due to the open burning of a large amount of straw. Therefore, how to effectively deal with and utilize straw is one of the main resource and environmental problems faced by rural areas in our country. [0003] On the other hand, at present, more than 20 million household biogas digesters have been bu...

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Problems solved by technology

[0004] However, because the straw contains a large amount of cellulose, hemicellulose and lignin, which are intertwined with each other, the surface is also covered with a layer of waxy layer, which plays the role of supporting, protecting and avoiding microbial invasion, so that the straw is biologically natural. The degradation is extremely slow; in addition, straw has material characteristics such as low density, large volume, and no fluidity. Therefore, the traditional straw biogas production technology has problems such as large reactor volume, low gas production rate, easy crusting, and difficulty in feeding and discharging materials. series of questions

Due to the different physical and chemical properties and refractory biodegradability of straw, since the 1990s, Europe and the United States and other countries have funded a large amount of research on new batch dry biogas fermentation technology, and some applications have been made. Complicated, cost prohibitive and therefore not widely adopted

At present, straw has not been used for biogas production on a large scale

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