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Directional acidification pretreatment method to improve gas production performance of anaerobic digestion of corn straw

A corn stover, anaerobic digestion technology, applied in fermentation, waste fuel and other directions, can solve the problems of difficult microbial degradation of lignocellulosic raw materials, limit the large-scale application of corn stover, shorten pretreatment time, improve equipment efficiency, biological The effect of improving degradability and gas generation performance

Active Publication Date: 2018-03-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hemicellulose, as a molecular adhesive, binds between cellulose and lignin, embeds cellulose molecules in it, forms a natural barrier, makes it difficult for enzymes to contact cellulose molecules, and makes it difficult for lignocellulose raw materials to be absorbed by microorganisms. degradation, limiting the large-scale application of corn stover for biogas production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Straw pretreatment

[0023] The present invention selects corn stalks that have been naturally air-dried and has no mildew, crushes them to 20 meshes with a pulverizer, weighs a certain amount of corn stalks with a crucible, puts them in an oven at 105°C, and measures the TS of corn stalks after 12 hours. A blue cap bottle (1 L) was used as an anaerobic reaction vessel with a reaction volume of 0.8 L. According to the corn stalk load of 65 g TS / L, 52 g TS corn stalks were first weighed. The pretreatment reagent of the present invention is sodium hydroxide, and its addition is 2% of the dry weight of corn stalks, then adds 308.68 milliliters of water to make it and the total mass of water (3.32 milliliters) contained in the corn stalks be 2% of the dry weight of corn stalks 6x (312ml). Sealed and stored at 40°C for 1 day for pretreatment.

[0024] (2) Acidification method

[0025] The anaerobic fermentation process requires an inoculum (activated sludge). The acti...

Embodiment 2

[0032] (1) Straw pretreatment

[0033] The present invention selects corn stalks that have been naturally air-dried and has no mildew, crushes them to 20 meshes with a pulverizer, weighs a certain amount of corn stalks with a crucible, puts them in an oven at 105°C, and measures the TS of corn stalks after 12 hours. A blue cap bottle (1 L) was used as an anaerobic reaction vessel with a reaction volume of 0.8 L. According to the corn stalk load of 65 g TS / L, 52 g TS corn stalks were first weighed. The pretreatment reagent of the present invention is sodium hydroxide, and its addition is 2% of the dry weight of corn stalks, then adds 308.68 milliliters of water to make it and the total mass of water (3.32 milliliters) contained in the corn stalks be 2% of the dry weight of corn stalks 6x (312ml). Sealed and stored at 40°C for 1 day for pretreatment.

[0034] (2) Acidification method

[0035] The anaerobic fermentation process requires an inoculum (activated sludge). The activa...

Embodiment 3

[0042] (1) Straw pretreatment

[0043] The present invention selects corn stalks that have been naturally air-dried and has no mildew, crushes them to 20 meshes with a pulverizer, weighs a certain amount of corn stalks with a crucible, puts them in an oven at 105°C, and measures the TS of corn stalks after 12 hours. A blue cap bottle (1 L) was used as an anaerobic reaction vessel with a reaction volume of 0.8 L. According to the corn stalk load of 65 g TS / L, 52 g TS corn stalks were first weighed. The pretreatment reagent of the present invention is sodium hydroxide, and its addition is 2% of the dry weight of corn stalks, then adds 308.68 milliliters of water to make it and the total mass of water (3.32 milliliters) contained in the corn stalks be 2% of the dry weight of corn stalks 6x (312ml). Sealed and stored at 40°C for 1 day for pretreatment. At the same time, a group of corn stalks without pretreatment was set as the control.

[0044] (2) Acidification method

[004...

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Abstract

The invention discloses a method for improving the anaerobic digestion gas-production performance of maize straws through directional acidification pretreatment, and belongs to the field of efficient resource utilization of maize straws. The method comprises the following steps: carrying out pretreatment on maize straws by using sodium hydroxide; acidifying the maize straws, and adding activated sludge into the pretreated maize straws, wherein relatively, 10-50 g of TS activated sludge is added into 52 g of TS maize straws; adding tap water until the tap water accounts for 80% of the total volume of a reaction container, mixing the obtained object, filling nitrogen into the reaction container, and hermetically fixing the container in a shaking table, wherein the temperature of the shaking table is kept at 40+ / -2 DEG C; measuring the pH value by using a pH meter every time, and when the pH value is less than 5.5, stopping acidifying; and after methanation startup is completed, by taking an acidified discharged material as a raw material, carrying out feeding and discharging once a day, wherein a fed material and the discharged material are same in volume, and the HRT (hydraulic retention time) is 40 days. According to the invention, the separation of an acidification stage and a methanation stage in biological sciences is realized, and the effects of acidification bacteria groups and methane-producing bacteria groups in respective stage are enhanced, thereby facilitating the stable and efficient operation of an acidification phase and a methane-producing phase, and greatly improving the biodegradability and gas production performance of maize straws.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency resource utilization of corn stalks, and relates to a method for improving the performance of anaerobic digestion and gas production of corn stalks through directional acidification pretreatment. Background technique [0002] Corn stalks belong to cellulosic biomass, rich in nutrients and easy-to-use chemical components, and are rich in renewable organic substances, but most of them are discarded or burned in the open, causing serious waste of resources, environmental pollution, and obstruction of normal traffic. question. [0003] Corn straw is mainly composed of three major components: cellulose, hemicellulose and lignin. Anaerobic digestion technology is used to process and utilize corn straw to produce efficient, clean and high-quality biomass energy—biogas, which is the resource utilization of corn straw. effective way. However, hemicellulose, as a molecular adhesive, binds between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 李秀金刘春梅袁海荣邹德勋刘研萍朱保宁
Owner BEIJING UNIV OF CHEM TECH
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