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Process for producing biogas from crop straw by dry fermentation

A technology of crop straw and dry fermentation, applied in fermentation, waste fuel and other directions, can solve the problems of low anaerobic digestibility of straw, limit large-scale application, and difficult to define, and achieve the effect of increasing biogas production

Inactive Publication Date: 2012-05-23
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the existing dry fermentation technology of crop straws to produce biogas is immature, which mainly includes two processes of crop straw pretreatment and dry fermentation, and the process factors affecting crop straw pretreatment and dry fermentation are numerous and difficult to define Which are the main factors and which are the secondary factors? The existing technology cannot make a positive organic coordination effect between the various process factors; Poor ability to degrade and digest
The above two problems lead to low anaerobic digestibility of straw and low gas production (generally around 400L / Kg·TS), which limits the large-scale application of crop straw biogas production

Method used

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  • Process for producing biogas from crop straw by dry fermentation
  • Process for producing biogas from crop straw by dry fermentation
  • Process for producing biogas from crop straw by dry fermentation

Examples

Experimental program
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Effect test

Embodiment 1～9

[0029] A process for producing biogas by dry fermentation of crop straw:

[0030] Crop straw pretreatment:

[0031] 1. Physically process the material, knead and cut the selected corn stalks with a straw kneading machine, so that the length is 2 to 5 cm, and the maximum length should not exceed 6 cm;

[0032] 2. Select an appropriate amount of cut corn stalks, weigh 252g of them with an electronic balance, put them into a container, add pond water of the same quality, moisten and soak the corn stalks for 15-24 hours, and then divide them equally into 9 servings, 28g each;

[0033] 3. Dissolve the selected straw compound bacteria agent and ammonium bicarbonate in water, pour it on 9 parts of wet corn straw, then stir it with a stirring rod, add water, make the corn straw and water mix evenly, and control the corn straw The moisture content reaches 60-80%. According to experience, if you hold the straw tightly with your hands, if there is water between your fingers, or a small...

Embodiment 10～18

[0057] A process for producing biogas by dry fermentation of crop straw:

[0058] Crop straw pretreatment:

[0059] 1. Physically process the material, knead and cut the selected corn stalks with a straw kneading machine, so that the length is 2 to 5 cm, and the maximum length should not exceed 6 cm;

[0060] 2. Select an appropriate amount of cut corn stalks, weigh 252g of them with an electronic balance, put them into a container, add pond water of the same quality, moisten and soak the corn stalks for 15-24 hours, and then divide them equally into 9 servings, 28g each;

[0061] 3. Dissolve the selected straw compound bacteria agent and ammonium bicarbonate in water, pour it on 9 parts of the wet corn straw, then stir it with a stirring rod, add water, mix the straw and water evenly, and control the moisture content of the corn straw Efficiency reaches 70%, and wherein stalk compound bacterial agent addition is 0.25%, and the addition of ammonium bicarbonate should guarant...

Embodiment 19

[0084] The crop straw is made of wheat straw, the water is fecal water with a pH value of 6.5 to 7.5, and the inoculum is bubbling sewer sludge with a pH value of 6.5 to 8.0; the crop straw pretreatment and dry fermentation process conditions adopt the best process conditions , that is: the addition amount of straw compound bacterial agent is 0.25%, the moisture content is 70%, the stacking retting temperature is 50°C, and the stacking retting time is 80h; the dry fermentation process conditions are: the inoculation amount is 25%, and the accelerator addition amount is 75g / (m 3 fermentation feed liquid), the concentration of the fermentation feed liquid is 25%, and the pH value of the fermentation feed liquid is 7.0. Others are all the same as in Example 1.

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Abstract

The invention discloses a process for producing biogas from crop straw by dry fermentation, which comprises the following steps of: chopping the crop straw, wetting and soaking the chopped crop straw by adding water, sprinkling a straw composite microbial inoculum and aqueous solution of ammonium bicarbonate onto the chopped crop straw, stirring and turning the chopped crop straw, and controllingthe water content of the chopped crop straws to between 60 and 80 percent; stacking the chopped crop straw, maintaining composting for 60 to 80 hours when the stacking temperature reaches 40 to 60 DEG C, and obtaining a fermented material liquid, wherein the adding amount of the straw composite microbial inoculum is 0.15 to 0.25 percent of the mass of the crop straw, and the adding amount of the ammonium bicarbonate guarantees that C / N of the fermented material liquid is equal to 25:1; and adding an inoculum and an accelerating agent into the fermented material liquid, and performing anaerobic fermentation at the normal temperature to generate the biogas, wherein the inoculation quantity is 15 to 25 percent, the adding amount of the accelerating agent is 55 to 75g per cubic meter of the fermented material liquid, the concentration of the fermented material liquid is 20 to 30 percent, and the pH value of the fermented material liquid is 6.0 to 6.8. The process optimizes the technological conditions of crop straw pre-treatment and dry fermentation and greatly increases the yield of the biogas.

Description

technical field [0001] The invention belongs to the technical field of biogas preparation and energy utilization of crop straws, and in particular relates to a process for producing biogas by dry fermentation of crop straws. Background technique [0002] In the past, the traditional raw material for biogas was poultry manure, but due to various reasons such as large-scale breeding in the aquaculture industry and rising grain prices, farmers' enthusiasm for free-range livestock and poultry has been affected. Therefore, due to insufficient raw materials or lack of raw materials in biogas digesters, the production of biogas is affected. Some biogas digesters do not produce gas all the year round due to lack of fermentation raw materials, and even abandon the pond. [0003] my country's crop stalks are abundant, and the effective use of crop stalks and other biomass energy is one of the important ways to solve the problem of energy consumption in rural and urban areas. Accelerat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 刘圣勇华磊郭前辉刘亮武少菁
Owner HENAN AGRICULTURAL UNIVERSITY