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A method for producing methane by anaerobic fermentation of straw

A technology for anaerobic fermentation and production of methane, which is applied in the direction of fermentation, waste fuel, etc. It can solve the problems affecting the success of anaerobic fermentation process, the reduction of biogas yield, and the deterioration of water absorption, so as to achieve small loss, reduce pollution, and use low cost effect

Active Publication Date: 2021-05-14
NORTHEAST AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, in the current biogas production stage, the lignin in the straw wraps the cellulose and hemicellulose during anaerobic fermentation, making it difficult for water molecules to enter, resulting in poor water absorption and settling properties of the straw. It directly caused the straw to float on the upper layer of the anaerobic fermentation system, thereby accumulating to form a scum layer, which further affected the success of the anaerobic fermentation process, and finally led to a decrease in the biogas yield

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  • A method for producing methane by anaerobic fermentation of straw

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Embodiment 1

[0048] A method for producing methane by anaerobic fermentation of stalks provided in this embodiment comprises the following steps:

[0049] Step 1, after cutting the straw into 2cm segments, and according to the ratio that every 100g of the straw requires 2000ml of the papermaking wastewater, the straw is placed in a sealed transparent fermentation reactor filled with papermaking wastewater, and the Mix at a temperature of ℃, keep the sealed state for 3 days to obtain the first mixed solution; shake the fermentation reactor twice a day, each time for 4 minutes, so that the papermaking wastewater can fully treat the straw;

[0050] Step 2, adding biogas slurry into the fermentation reactor as an inoculum to obtain a second mixed solution, and ensuring that the total solid content of the second mixed solution is in the range of 6%;

[0051] Step 3, adding an acidic solution into the fermentation reactor to obtain a third mixed solution, and making the pH range of the third mix...

Embodiment 2

[0055] A method for producing methane by anaerobic fermentation of stalks provided in this embodiment comprises the following steps:

[0056] Step 1: After cutting the stalks into small sections of 3 cm, and according to the ratio that 2600 ml of the papermaking wastewater is required for every 130 g of the stalks, the stalks are placed in a sealed transparent fermentation reactor filled with papermaking wastewater, and the Mix at a temperature of ℃, and keep the sealed state for 3 days to obtain the first mixed solution; and shake the fermentation reactor 3 times a day, each time for 5 minutes, so that the papermaking wastewater can fully treat the straw;

[0057] Step 2, adding biogas slurry into the fermentation reactor as an inoculum to obtain a second mixed solution, and ensuring that the total solid content of the second mixed solution is in the range of 7%;

[0058] Step 3, adding an acidic solution into the fermentation reactor to obtain a third mixed solution, and mak...

Embodiment 3

[0062] A method for producing methane by anaerobic fermentation of stalks provided in this embodiment comprises the following steps:

[0063] Step 1, after cutting the straw into small sections of 3 cm, and according to the ratio that every 150 g of the straw needs 3000 ml of the papermaking wastewater, the straw is placed in a sealed transparent fermentation reactor filled with papermaking wastewater, and the Mix at a temperature of ℃, and keep the sealed state for 4 days to obtain the first mixed solution; and shake the fermentation reactor 3 times a day, each time lasting for 6 minutes, so that the papermaking wastewater can fully treat the straw;

[0064] Step 2, adding biogas slurry into the fermentation reactor as an inoculum to obtain a second mixed solution, and ensuring that the total solid content of the second mixed solution is in the range of 8%;

[0065] Step 3, adding an acidic solution into the fermentation reactor to obtain a third mixed solution, and making th...

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Abstract

The invention provides a method for producing methane by anaerobic fermentation of straw, which relates to the technical field of methane preparation. The method for producing methane by anaerobic fermentation of straw comprises the following steps: after cutting the straw into small sections of 2-3 cm, Place it in a sealed fermentation reactor filled with papermaking wastewater, mix it at a temperature of 50-55°C, and keep it in a sealed state for 3-4 days, then add biogas slurry to the fermentation reactor as an inoculum, and continue to Acidic solution is added into the fermentation reactor to make the pH range of the mixed solution 6.8-7.5; nitrogen is continuously fed into the fermentation reactor for anaerobic fermentation to obtain methane. The present invention pretreats the straw with papermaking wastewater, destroys the lignin inside the straw, allows water molecules to enter the inside of the straw during the anaerobic fermentation process, improves the settleability of the straw, and solves the problem of the scum crust layer. Promote the process of anaerobic fermentation and increase the production of methane gas.

Description

technical field [0001] The invention relates to the technical field of methane preparation, in particular to a method for preparing methane by anaerobic fermentation of straw. Background technique [0002] my country is a large agricultural country, and more than 800 million tons of straw are produced every year during the growth and production of a large number of agricultural products, among which the output of corn straw accounts for more than 25% of the total straw output. Since 2014, after the state promulgated the ban on straw burning, the comprehensive utilization rate of straw has been greatly improved, but there are still a large number of straws that have not been utilized, causing serious environmental pollution and a great waste of resources. [0003] In the existing technology, straw is widely used as raw material for biogas projects, and clean energy biogas is obtained through anaerobic fermentation. This method solves the problems of subsequent treatment and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 孙勇孟祥汇曲京博刘昱英男李楠王智曲斌
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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