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Method for increasing biogas yield through co-digestion of cow dung and pretreated corn stalks

A corn stalk and pretreatment technology, which is applied in the field of agricultural waste resource utilization, can solve the problems of long fermentation period, low methane content, low gas production efficiency, etc., and achieves increased methane content, increased fermentation concentration, and increased gas production. Effect

Active Publication Date: 2017-07-07
黑龙江省农业科学院农村能源研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of long fermentation period, low gas production efficiency and low methane content in the existing biogas production methods, a method of joint digestion of cow dung and pretreated corn stalks to increase biogas production is provided

Method used

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  • Method for increasing biogas yield through co-digestion of cow dung and pretreated corn stalks
  • Method for increasing biogas yield through co-digestion of cow dung and pretreated corn stalks

Examples

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Effect test

Embodiment 1

[0041] A method for improving biogas production through joint digestion of cow dung and pretreated corn stalks, said method is realized according to the following steps:

[0042] Step 1, crushing the dried corn stalks to 1-3cm;

[0043] Step 2, under the conditions of 121 degrees and 142kPa, high-pressure treatment for 15 minutes;

[0044] Step 3. Soak the treated corn stalks in step 2 in a 7g·L-1NaOH solution in a water bath at 35°C, and remove the NaOH solution after soaking for 3 hours;

[0045] The corn stalks treated in step 4 and step 3 are soaked in biogas slurry for 2 days at 35°C (the natural temperature of the old biogas slurry) to obtain the pretreated corn stalks;

[0046]Step 5: Take about 5 g of 3 pretreated corn stalks by weighing, and measure the TS and VS (organic dry matter content) contents of the stalks with a high-temperature drying oven and a muffle furnace. Weigh 240g (calculated in TS) of pretreated corn stalks and 80g (calculated in TS) of cow dung, ...

Embodiment 2

[0049] A method for improving biogas production through joint digestion of cow dung and pretreated corn stalks, said method is realized according to the following steps:

[0050] Step 1, crushing the dried corn stalks to 1-3cm;

[0051] Step 2, under the conditions of 115 degrees and 150kPa, high-pressure treatment for 12 minutes;

[0052] Step 3. Soak the corn stalks treated in step 2 in 6g·L-1NaOH solution in a water bath at 32°C, and remove the NaOH solution after soaking for 2 hours;

[0053] Step 4, soaking the treated corn stalks in step 3 with biogas slurry for 3 days at 35°C (the natural temperature of the old biogas slurry) to obtain the pretreated corn stalks;

[0054] Step 5: Take about 5 g of 3 pretreated corn stalks by weighing, and measure the TS and VS (organic dry matter content) contents of the stalks with a high-temperature drying oven and a muffle furnace. Weigh 240g (calculated in TS) of pretreated corn stalks and 80g (calculated in TS) of cow dung, add 1...

Embodiment 3

[0057] A method for improving biogas production through joint digestion of cow dung and pretreated corn stalks, said method is realized according to the following steps:

[0058] Step 1, crushing the dried corn stalks to 1-3cm;

[0059] Step 2, under the conditions of 125 degrees and 155kPa, high-pressure treatment for 18 minutes;

[0060] Step 3. Soak the corn stalks treated in step 2 in 6g·L-1NaOH solution in a water bath at 32°C, and remove the NaOH solution after soaking for 2 hours;

[0061] Step 4, soaking the treated corn stalks in step 3 with biogas slurry for 3 days at 35°C (the natural temperature of the old biogas slurry) to obtain the pretreated corn stalks;

[0062] Step 5: Take about 5 g of 3 pretreated corn stalks by weighing, and measure the TS and VS (organic dry matter content) contents of the stalks with a high-temperature drying oven and a muffle furnace. Weigh 240g (calculated in TS) of pretreated corn stalks and 80g (calculated in TS) of cow dung, add 1...

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Abstract

The invention relates to a technical method for efficiently generating biogas through anaerobic co-digestion of different materials and belongs to the field of agricultural waste recycling. The problem to be solved is to provide a method for increasing biogas yield. The method comprises the following steps: firstly, crushing the corn stalks and performing high-pressure treatment on the corn stalks for 10-20min under the conditions of high temperature and high pressure; soaking the corn stalks after the high-pressure treatment into 7g.L-1 NaOH solution for 3h under the condition at 35 DEG C; soaking the treated corn stalks in biogas slurry for 2-4d under the condition at 35 DEG C; and uniformly mixing the pretreated stalk raw material with cow dung at mass ratio of 3:1, regulating pH value, adding 30% active anaerobic sludge, adding water for diluting till TS is about 8% and then performing medium-temperature anaerobic co-digestion. Compared with single materials, such as, straws and cow dung, the co-digestion has the advantages that the stalk pretreatment period and the fermenting period of anaerobic digestion are obviously shortened, the biogas generation efficiency is obviously increased and the methane content is obviously increased.

Description

technical field [0001] The invention belongs to the field of resource utilization of agricultural waste, and relates to a method for increasing biogas output through joint anaerobic digestion of different materials. Background technique [0002] With the development of society and the continuous improvement of people's living standards, energy crisis and environmental pollution have become important factors affecting the progress of our society. The use of anaerobic digestion technology to convert livestock and poultry manure and crop straw into biogas can not only alleviate the resource and energy crisis faced by our country, but also solve the problem of environmental pollution caused by the random disposal of a large number of livestock and poultry manure and crop straw. In the anaerobic digestion technology with microbial transformation as the core, the joint anaerobic digestion technology of two or more substrates can not only improve the gas production of biological su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04C02F103/20
CPCC02F11/04C02F2103/20C12P5/023C12P2203/00Y02E50/30
Inventor 裴占江刘杰史风梅王粟卢玢宇高亚冰
Owner 黑龙江省农业科学院农村能源研究所