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Anaerobic fermentation method for straw

An anaerobic fermentation and straw technology, applied in fermentation, waste fuel, etc., can solve the problems of low methane production and insufficient metabolites, and achieve the effects of increasing production, facilitating absorption and utilization, and increasing methane production

Active Publication Date: 2017-11-17
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides an anaerobic fermentation method of straw, which can effectively solve the problems of low methane production and insufficient amount of metabolites in the acid production stage in the existing anaerobic fermentation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for anaerobic fermentation of stalks, comprising the following steps:

[0026] (1) Crush the straw into 120-mesh powder, add water to soak for 60 minutes, then add potassium sulfite solution accounting for 50% of the powder weight and a concentration of 20%, and cook at 90°C for 2 hours;

[0027] (2) Then add a compound enzyme accounting for 3% of the powder weight and an enzyme activity of 80U / mL to the product obtained in step (1), and perform ultrasonic enzymolysis at 30KHz and 300W for 80min; wherein the compound enzyme includes cellulase, fruit Glue enzyme and proteolytic enzyme, the weight ratio of described cellulase, pectinase and proteolytic enzyme is 2:1:0.8;

[0028] (3) Adding 5% by weight of straw powder and 50% concentration of sodium hydroxide solution to the product obtained in step (2), soaking for 30 minutes;

[0029] (4) Filtrate the product obtained in step (3), separate the straw powder and the solution, then use acetic acid to adjust the ...

Embodiment 2

[0032] A method for anaerobic fermentation of stalks, comprising the following steps:

[0033] (1) Crush the straw into 100-mesh powder, add water to soak for 48 minutes, then add potassium sulfite solution accounting for 34% of the powder weight and a concentration of 24%, and cook at 80°C for 2 hours;

[0034] (2) Add compound enzymes accounting for 2.8% of powder weight and 70U / mL enzyme activity to the product obtained in step (1), and perform ultrasonic enzymolysis at 30KHz and 280W for 40min; wherein the compound enzymes include cellulase, fruit Glue enzyme and proteolytic enzyme, the weight ratio of described cellulase, pectinase and proteolytic enzyme is 1.5:1.2:0.6;

[0035] (3) Add 55% sodium hydroxide solution accounting for 3.8% by weight of the straw powder to the product obtained in step (2) and soak for 30 minutes;

[0036] (4) Filter the product obtained in step (3), separate the straw powder and the solution, then use acetic acid to adjust the pH value of the...

Embodiment 3

[0039] A method for anaerobic fermentation of stalks, comprising the following steps:

[0040] (1) Crush the straw into 120-mesh powder, add water to soak for 60 minutes, then add potassium sulfite solution accounting for 30% of the powder weight and 50% concentration, and cook at 80°C for 1 hour;

[0041] (2) Then add a compound enzyme accounting for 2% of the powder weight and an enzyme activity of 80U / mL to the product obtained in step (1), and perform ultrasonic enzymolysis at 20KHz and 200W for 40min; wherein, the compound enzyme includes cellulase, fruit Glue enzyme and proteolytic enzyme, the weight ratio of described cellulase, pectinase and proteolytic enzyme is 2:2:0.3;

[0042] (3) Add 5% by weight of straw powder and 60% sodium hydroxide solution to the product obtained in step (2), and soak for 20 minutes;

[0043] (4) Filter the product obtained in step (3), separate the straw powder and the solution, then use acetic acid to adjust the pH value of the solution t...

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Abstract

The invention discloses an anaerobic fermentation method for straw. The anaerobic fermentation method for the straw comprises the following steps that (1) sulfite is adopted to pretreat straw powder; (2) the pretreated straw powder is subjected to ultrasonic enzymolysis; (3) then the straw powder is soaked by using a sodium hydroxide solution; (4) the straw powder and the solution are separated, and acidogenic fermentation is conducted correspondingly; and (5) finally, methane-producing fermentation process is conducted. According to the anaerobic fermentation method for the straw, the yield of metabolite in the acid producing stage can be increased effectively so that the yield of methane and the use ratio of the straw can be increased.

Description

technical field [0001] The invention belongs to the technical field of anaerobic fermentation of crops, and in particular relates to an anaerobic fermentation method of straw. Background technique [0002] China is very rich in straw resources, with an annual output of 570-600 million tons of straw, accounting for 20-30% of the world's total straw production. However, there are still a lot of problems in the treatment of straw. Although the concept of biogas has begun to be popularized in rural areas and biogas digesters are set up, a large amount of straw is still treated by open-air burning, resulting in serious air pollution and waste of resources. Straw contains A large amount of cellulose, hemicellulose and other non-degradable substances seriously affect the efficiency of straw fermentation to produce biogas, resulting in low methane production, which is also one of the reasons why a large amount of straw is burned in the open. Contents of the invention [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 魏珞宇张国治雷云辉胡国全
Owner BIOGAS SCI RES INST MIN OF AGRI
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