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A biogas fermentation method for pretreatment of straw

A biogas fermentation and pretreatment technology, applied in fermentation, waste fuel and other directions, to achieve the effect of less addition, mild pretreatment conditions, simple and safe use method

Active Publication Date: 2022-02-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no relevant report on biogas fermentation of straw pretreated with AlMgCu alloy

Method used

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  • A biogas fermentation method for pretreatment of straw
  • A biogas fermentation method for pretreatment of straw
  • A biogas fermentation method for pretreatment of straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The total volume of the anaerobic fermentation reactor is 500mL, and the amount of rice straw crushed to about 20 mesh is 20gTS. The pretreatment reagent used is AlMgCu alloy powder with a particle size of 200 mesh. The composition of the AlMgCu alloy powder is Al:90~95% , Mg: 2~10%, Cu: 2~10%, the inoculum is pig manure digestive juice, the addition amount is about 6.67gTS, and the addition ratio is rice straw TS: inoculum TS=3:1.

[0032] Weigh 20g TS of straw into a ziplock bag, add the mass fraction (relative to the mass of straw TS) from low to high as w 1 %,w 2 %,w 3 %,w 4 % AlMgCu alloy powder, add 6 times (relative to straw TS quality) water, mix and seal, heat in a water bath at 20-50°C, inoculate anaerobic digested sludge after 3 days, and start anaerobic fermentation. Transfer the pretreated rice straw and inoculum to a self-made anaerobic fermentation device, the volume of the fermentation bottle is 500mL, add water to the effective volume of 400mL, add C...

Embodiment 2

[0038] AlMgCu alloy powder with content of Al: 80-90%, Mg: 5-10%, Cu: 5-10% is used as the pretreatment agent, and the alloy particle size is 200 mesh.

[0039] Weigh two parts of 20gTS of straw into a ziplock bag, add 6 times of water, and add a part of straw to the mass fraction of straw TS w 1% (same as w in implementation case 1 1 %) of AlMgCu, after adding water and stirring well, select T from low to high 1 (20~30℃), T 2 (30~40℃) and T 3 (40-50°C) heated in a water bath at three temperatures, and one part without pretreatment was used as the control group. After 3 days, inoculate the pig manure digestive solution, add water to the maximum working volume of the fermentation bottle of 400mL, and start the fermentation.

[0040] Figure 4 In order to accumulate the methane production map, it can be seen from the figure that the AlMgCu alloy powder in this case can improve the methane production capacity of straw under low temperature pretreatment. As the temperature i...

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Abstract

The invention relates to a biogas fermentation method for pretreating straw, which uses AlMgCu alloy powder under certain parameters to pretreat the straw to improve its anaerobic fermentation gas production performance, especially to increase the methane content. The present invention eliminates the cumbersome preparations in the early stage of pretreatment such as the configuration required by the existing chemical method or the cultivation required by the biological method. The pretreatment conditions are mild, the requirements for equipment are low, and the energy consumption is low. The gas production of straw after pretreatment is increased by about 20%. The methane production is increased by about 25%, which can realize the resource and energy conversion of a large amount of straw.

Description

technical field [0001] The invention belongs to the field of anaerobic fermentation of organic solid waste. Specifically, it relates to a biogas fermentation method for pretreatment of straw, in particular to a method for improving the content of gas and methane produced by anaerobic fermentation of straw by pretreatment with AlMgCu alloy powder. Background technique [0002] Lignocellulose is an abundant renewable energy source that can be converted into biofuel methane using anaerobic fermentation technology. As a kind of lignocellulosic materials, rice straw has an annual output of up to 1 billion tons in my country, but its main components, lignin, cellulose and hemicellulose, are tightly cross-linked to form a complex carbohydrate structure, which is not conducive to the development of microorganisms. The utilization of cellulose leads to low effective degradation rate of straw and low efficiency of anaerobic fermentation gas production. In recent years, a large number ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00Y02E50/30
Inventor 杨晓进张媛媛佟艳明陈希杨朝阳胡汉君
Owner BEIJING UNIV OF CHEM TECH
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