Method for improving biogas production performance of anaerobic fermentation of wheat straw through low-temperature freeze-thawing pretreatment

Abstract

The invention belongs to the technical field of biomass energy, and particularly relates to a method for improving biogas production performance of anaerobic fermentation of wheat straw through low-temperature freeze-thaw pretreatment. The method comprises the following steps: airing straw, and performing crushing and drying; adding water into the dried wheat straw, adjusting the mass ratio of solid to liquid to be 1: (8-10), and soaking the mixture obtained after full mixing at room temperature for 6-10 hours; freezing the mixture for 12-96 hours at the temperature of -80 to-10 DEG C, and then naturally performing unfreezing; filtering out the wheat straw, and performing drying to obtain pretreated wheat straw; adding the pretreated wheat straw and inoculum into a fermentation tank for anaerobic fermentation, and finishing the whole fermentation period when gas production is stopped. According to the method, the biogas is prepared from the wheat straw, so that resource utilization ofthe wheat straw is realized; the straw is subjected to freeze-thaw pretreatment, the freeze-thaw pretreatment technology mainly enables the straw structure to become loose and porous, and the gas production efficiency is improved; the method is safe and non-toxic, and does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of biomass energy, and in particular relates to a method for improving the biogas production performance of wheat straw anaerobic fermentation through low-temperature freeze-thaw pretreatment. Background technique [0002] Wheat is the most widely distributed crop with the largest yield in the world. my country is the largest wheat producer in the world. According to the National Bureau of Statistics, my country's wheat production has reached 133,590,000 tons in December 2019, which is the resource utilization of wheat straw. Provides an abundance of raw material, making wheat the second largest lignocellulosic material in the world. However, many straws cannot be effectively utilized, and are only used as feed through incineration, which restricts their resource utilization. The use of wheat straw for anaerobic fermentation to produce biogas is considered to be an effective energy conversion method. This co...

AI Technical Summary

Problems solved by technology

Traditional physical methods are non-toxic and harmless, including mechanical cutting, ball milling, hydrothermal treatment, etc., which need to introduce mechanical equipment, increase equipment purchase costs, and consume electricity during the processing process, so the cost is relatively high, and the structure of the straw changes. The effect is limited and the efficiency is low; at the same time, in the traditional physical pretreatment process, the friction of the machine generates heat, and the high temperature will cause some fermentation inhibitors

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