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Crop straw pretreatment method for straw biogas engineering in cold regions

A crop straw and pretreatment technology, which is applied in the direction of waste fuel, fermentation, etc., can solve the problems of long pretreatment time of straw and low enzymatic hydrolysis efficiency, so as to solve the problem of low efficiency and high cost, increase porosity, and reduce the loss of nutrients Effect

Inactive Publication Date: 2019-02-12
黑龙江省科学院科技孵化中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of long straw pretreatment time and low enzymatic hydrolysis efficiency, the present invention provides a crop straw pretreatment method for straw biogas projects in cold regions

Method used

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  • Crop straw pretreatment method for straw biogas engineering in cold regions

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Effect test

Embodiment 1

[0026] A crop straw pretreatment method for straw biogas engineering in cold regions, the steps are as follows:

[0027] Step 1, putting the crop straw into a closed container after crushing, adding water to the closed container to keep the crushed straw at a certain moisture content, compacting the crushed straw, sealing the container, storing it at a certain temperature for a certain period of time to obtain yellow storage straw;

[0028] Step 2: Spray evenly the sodium bisulfite pretreatment solution of a certain mass concentration on the yellow stalks obtained in the step 1, soak at a certain temperature for a certain period of time to complete the pretreatment.

Embodiment 2

[0030] A crop straw pretreatment method for straw biogas engineering in cold regions, the steps are as follows:

[0031] Step 1. Crush crop straws to 0.5 cm and put them into an airtight container. The crop straws include one or a combination of corn straws, wheat straws, rice straws or soybean straws;

[0032] Adding water to the airtight container to keep the moisture content of the crushed straw at 71-75%, sealing the container after compacting the crushed straw, and storing it at a temperature of 5-15°C for 60-90 days to obtain yellow stalks;

[0033] Step 2: Spray evenly the sodium bisulfite pretreatment solution of a certain mass concentration on the yellow stalks obtained in the step 1, soak at a certain temperature for a certain period of time to complete the pretreatment.

Embodiment 3

[0035] A crop straw pretreatment method for straw biogas engineering in cold regions, the steps are as follows:

[0036] Step 1. Crush the crop straws to 0.5 cm and put them into an airtight container. The crop straws include one or a combination of corn straws, wheat straws, rice straws or soybean straws.

[0037] Adding water to the airtight container to keep the moisture content of the crushed straw at 71-75%, sealing the container after compacting the crushed straw, and storing it at a temperature of 5-15°C for 60-90 days to obtain yellow stalks;

[0038] Step 2. Spray evenly the sodium bisulfite pretreatment solution with a mass concentration of 5-10% on the yellow stalks obtained in step 1 and reach the state of infiltration. , hold the stalks of yellow stalks with your hands, with water droplets between your fingers but not dripping, soak at a temperature of 30-80°C for 65-80 hours to complete the pretreatment.

[0039] In this example, sodium bisulfite is used to chan...

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Abstract

The invention relates to a crop straw pretreatment method for straw biogas engineering in cold regions, and belongs to the technical field of pretreatment of raw materials of biogas engineering, whichsolves the problems of long straw pretreatment time and low enzymolysis efficiency. The crop straw pretreatment method specifically comprises the following steps of step 1, crushing crop straw, putting into a sealed container, adding water into the sealed container to enable the crushed straw to maintain a certain water content, pressing the crushed straw, sealing the container, and storing for aperiod of time at a certain temperature, so as to obtain straw subjected to yellow corn silage; step 2, uniformly spraying pretreatment liquid of sodium hydrogen sulfite with a certain mass concentration to the straw subjected to yellow corn silage obtained in step 1, soaking for a certain period of time at a certain temperature, so as to complete pretreatment. The crop straw pretreatment methodhas the advantages that the structure of lignin in the straw is changed by the sodium hydrogen sulfite, and the lignin is dissolved out, hemicellulose is effectively degraded and dissolved out under acid conditions, the effective contact between a cellulase system and cellulose is increased, the enzymolysis efficiency is improved, and the pretreatment time is shortened.

Description

technical field [0001] The invention belongs to the technical field of biogas engineering raw material pretreatment, and in particular relates to a crop straw pretreatment method for straw biogas engineering in cold regions. Background technique [0002] China is a large traditional agricultural production country, with abundant and widely distributed crop straw resources. The resource utilization of a large amount of crop straw produced in the process of agricultural production, that is, the conversion of crop straw into biogas through anaerobic fermentation technology, is an important way to rationally utilize agricultural waste. [0003] However, in cold regions, straw raw materials for straw biogas projects have seasonal and time-sensitive limitations. After the harvest of corn in autumn, a large amount of straw is piled up in the field. If the storage conditions are not up to standard, it will easily cause rot and deterioration, resulting in the loss of raw materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 苏小红刘伟赵娴王欣徐晓秋范超陆佳周闯王玉鹏秦国辉罗向东
Owner 黑龙江省科学院科技孵化中心
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