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Method for improving anaerobic digestion gas production performances by freezing and pre-processing corn stalks with low-temperature water

A technology for freezing pretreatment and corn stalks, which is applied in the field of anaerobic digestion of corn stalks, and achieves the effects of mild operating conditions, low requirements for pressure resistance and corrosion resistance, and simple operation.

Active Publication Date: 2015-05-06
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of efficiently pretreating corn stalks under low-pollution and mild operating conditions, it is intended to provide a method that can effectively improve the gas production performance of corn stalks and open up a new way for the full utilization of corn stalks

Method used

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  • Method for improving anaerobic digestion gas production performances by freezing and pre-processing corn stalks with low-temperature water
  • Method for improving anaerobic digestion gas production performances by freezing and pre-processing corn stalks with low-temperature water
  • Method for improving anaerobic digestion gas production performances by freezing and pre-processing corn stalks with low-temperature water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 3 parts of corn stalks crushed to below 20 mesh, each part of corn stalks has a quality of 52g (in TS), add 100.68 milliliters of water to make it and the total mass of corn stalks contained in water (3.32 milliliters) be corn stalks 2 times the dry weight (104 ml). Store in airtight condition at 20°C for 1 day, 3 days and 5 days for pretreatment. At the same time, a group of untreated corn stalks without adding water was set as a control.

[0022] The pretreated corn stalks were mixed with 12g TS anaerobic sludge respectively, added to the anaerobic digestion reaction device, and tap water was added to reach 80% of the reaction device. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 35°C, and shake. The anaerobic fermentation period is 75 days. The daily gas production volume was recorded by the drainage gas collection method, and the volume fraction of methane was measured every day to calculate the total methan...

Embodiment 2

[0036] Weigh 3 parts of corn stalks crushed to below 20 mesh, each part of corn stalks has a weight of 52g (calculated in TS), add tap water 6 times its dry weight, add 308.68 ml of water to make it equal to the water contained in the corn stalks (3.32 ml) had a total mass of 6 times the dry weight of corn stover (312 ml). Sealed storage at -20°C for 1 day, 3 days and 5 days for pretreatment. At the same time, a group of untreated corn stalks without adding water was set as a control.

[0037] The pretreated corn stalks were mixed with 12g (TS) anaerobic sludge respectively, added to the anaerobic digestion reaction device, and tap water was added to 80% of the reaction device. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 35°C, and shake. The anaerobic fermentation period is 75 days. The daily gas production volume was recorded by the drainage gas collection method, and the volume fraction of methane was measured every day ...

Embodiment 3

[0054] Weigh 3 parts of corn stalks crushed to below 20 mesh, each part of corn stalks has a weight of 52g (calculated in TS), add tap water 10 times its dry weight, and add 516.68 ml of water to make it equal to the water contained in the corn stalks. (3.32 ml) with a total mass of 10 times the dry weight of corn stover (520 ml). Store in airtight condition at 4°C for 1 day, 3 days and 5 days for pretreatment. At the same time, a group of untreated corn stalks without adding water was set as a control.

[0055] The pretreated corn stalks were mixed with 12g (TS) anaerobic sludge respectively, added to the anaerobic digestion reaction device, and tap water was added to 80% of the reaction device. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 35°C, and shake. The anaerobic fermentation period is 75 days. The daily gas production volume was recorded by the drainage gas collection method, and the volume fraction of methane was ...

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Abstract

The invention discloses a method for improving anaerobic digestion gas production performances by freezing and pre-processing corn stalks with low-temperature water, and belongs to the technical field of efficient resource utilization of the corn stalks. The method comprises the following steps: pre-processing the corn stalks by taking tap water as a pre-processing reagent and sealing with a sealing film after stirring, wherein the addition amount of the tap water is 1-10 times the dry weight of the corn stalks; sealing and storing for 3 days at (-)20 DEG C -20 DEG C, and pre-processing; performing anaerobic fermentation after pre-processing, wherein an anaerobic fermentation process needs active sludge, and the addition amount of the active sludge is 12 g TS relative to 52 g TS corn stalks; after adding the active sludge, adding tap water until 80% of the total volume of a reaction device, introducing a nitrogen gas, sealing with a rubber plug, fixing a reactor in a shaking table, and shaking by keeping a temperature of the shaking table at 35 + / - 2 DEG C. After low-temperature water pre-processing, the volume of the total gas is increased by 27%-60%, and the volume of total methane is increased by 70%-110%; residual biogas residue subjected to the anaerobic digestion does not generate secondary pollution, and is an excellent fertilizer for crop growth. The method is low in cost, simple to operate and gentle in operation condition.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency resource utilization of corn stalks, and relates to an anaerobic digestion process of corn stalks pretreated by low-temperature water freezing. 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 cellulose and lignin, embeds cellulose molecules in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
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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