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Method for preparing biogas through mixed anaerobic fermentation of cow dung and corn straw

A corn stalk and anaerobic fermentation technology, applied in fermentation, biological sludge treatment, waste fuel, etc., can solve the problems of slow start-up of the biogas fermentation process, difficult microbial decomposition and utilization, and difficult microbial attachment, etc., to achieve long fermentation cycle and reduce Production cost and the effect of less gas production

Inactive Publication Date: 2019-07-19
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of straw anaerobic fermentation to produce biogas has a history of several decades, but because the special structure of lignin, cellulose and hemicellulose in straw is not easy for microorganisms to attach, it is difficult to be decomposed and utilized by microorganisms, resulting in the biogas fermentation process. Slow start, long fermentation cycle, low gas production rate

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing biogas by mixed anaerobic fermentation of cow dung and corn stalks, the specific steps are as follows:

[0029] (1) Mechanical crushing: crush corn stalks, use corn stalks with a moisture content of less than 30% for crushing, and the crushing specification reaches 55 mesh;

[0030] (2) Alkaline hydrolysis pretreatment: pretreat corn stalks, mix crushed corn stalks with 8% sodium hydroxide solution, the solid-to-liquid ratio after mixing is 1:10 (1g:10ml), carry out Hydrolysis pretreatment; take out after soaking at room temperature for 48 hours;

[0031] (3) Washing treatment: After taking out the straw, use distilled water to rinse the alkali remaining in the straw until the pH is 6.5, and then put it in a cool place to dry naturally;

[0032] (4) Mixed material: Mix the treated corn stalks with cow dung with a humidity of 60% to 70% in a mass ratio of 1.5:1, and mix them with 1.5mg·kg -1 The amount of trace element Fe added to the mixture 2+...

Embodiment 2

[0039] A method for preparing biogas by mixed anaerobic fermentation of cow dung and corn stalks, the specific steps are as follows:

[0040] (1) Mechanical crushing: crush corn stalks, use corn stalks with a moisture content of less than 30% for crushing, and the crushing specification reaches 60 mesh;

[0041] (2) Alkaline hydrolysis pretreatment: pretreat corn stalks, mix crushed corn stalks with 8% sodium hydroxide solution, the solid-to-liquid ratio after mixing is 1:10 (1g:10ml), carry out Hydrolysis pretreatment; take out after soaking at room temperature for 48 hours;

[0042] (3) Washing treatment: After taking out the straw, use distilled water to rinse the alkali remaining in the straw until the pH is 7.5, and then place it in a cool place to dry naturally;

[0043] (4) Mixed material: Mix the treated corn stalks with cow dung with a humidity of 60% to 70% according to the mass ratio of 2:1, and mix them according to 1.0mg·kg -1 The amount of trace element Fe adde...

Embodiment 3

[0050] A method for preparing biogas by mixed anaerobic fermentation of cow dung and corn stalks, the specific steps are as follows:

[0051] (1) Mechanical crushing: crush corn stalks, use corn stalks with a moisture content of less than 30% for crushing, and the crushing specification reaches 40 mesh;

[0052] (2) Alkaline hydrolysis pretreatment: pretreat corn stalks, mix crushed corn stalks with 8% sodium hydroxide solution, the solid-to-liquid ratio after mixing is 1:10 (1g:10ml), carry out Hydrolysis pretreatment; take out after soaking at room temperature for 48 hours;

[0053] (3) Washing treatment: After taking out the straw, use distilled water to rinse the alkali remaining in the straw until the pH is 7, and place it in a cool place to dry naturally;

[0054] (4) Mixed material: Mix the treated corn stalks with cow dung with a humidity of 60% to 70% according to the mass ratio of 1.63:1, and mix according to 1.225mg·kg -1 The amount of trace element Fe added to th...

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Abstract

The invention provides a method for preparing biogas through mixed anaerobic fermentation of cow dung and corn straw. The method comprises the steps of with the corn straw and the cow dung as raw materials, firstly pretreating the corn straw in a manner of mechanical crushing and basic hydrolysis, then mixing the pretreated corn straw with the cow dung in the mass ratio being (1.5-2) to 1, addingFe2+ according to the quantity being 1.0mg.L<-1>-1.5mg.L<-1>, adjusting the total solid content of a mixture to be 6%-10%, with anaerobic sludge as a fermentation initiator, controlling the anaerobicfermentation temperature to be 20-30 DEG C, and in the fermentation process, performing noncontinuous stirring. The biogas is prepared by the method, fermentation starting is quick, the fermentation period is shortened, the decomposition rate of raw materials is increased, the biogas yield is promoted, the content of methane in gas is increased, and the stability of the fermentation process is increased.

Description

technical field [0001] The invention relates to the field of resource utilization of waste, in particular to a method for preparing biogas by anaerobic fermentation of cow dung and corn stalks. Background technique [0002] With the excessive exploitation and utilization of fossil energy, the problem of rising energy prices has become increasingly prominent. Biomass energy has attracted much attention due to its low production cost, recyclable utilization, and less environmental problems. [0003] As a cheap and potential biomass energy, biogas is playing an increasingly important role in production and life. China produces a large amount of crop residues (roughly estimated to be 700 million tons in 2018) every year. If they are not properly disposed of in a timely and effective manner and burned on the spot, it will not only waste resources, but also cause harm to the environment. relatively serious pollution. In addition, with the continuous development of animal husband...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 单德鑫姚昱岑高一文刘静刘益均王燕
Owner CHONGQING UNIV OF ARTS & SCI
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