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Method for promoting yield of methane produced by straw anaerobic fermentation through ethanol and biochar and application

A combination of biological and anaerobic fermentation technology, applied in the direction of fermentation, adding compounds to stimulate growth, waste fuel, etc., can solve the problems of low biogas production, low gas production rate, long fermentation cycle, etc., to improve biogas production, porosity Effects of complex structure and improved utilization efficiency

Pending Publication Date: 2022-03-29
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although anaerobic fermentation is a good way to deal with straw, the efficiency is not high at present, mainly due to the common problems of long fermentation period, low gas production rate, low methane content and low biogas production in anaerobic fermentation biogas technology.

Method used

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  • Method for promoting yield of methane produced by straw anaerobic fermentation through ethanol and biochar and application
  • Method for promoting yield of methane produced by straw anaerobic fermentation through ethanol and biochar and application
  • Method for promoting yield of methane produced by straw anaerobic fermentation through ethanol and biochar and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Pretreatment:

[0043] Rapeseed straw was pretreated with 1% NaOH solution at 60°C for 48 hours, and the liquid-solid ratio was 10mL / g.

[0044] 2. Anaerobic fermentation

[0045]Anaerobic fermentation was carried out in a 500 mL fermentation bottle. 8 g of pretreated rape straw was added to 240 g of fresh inoculated sludge (TS was 6.67%, VS was 4.71%; the dry mass ratio of rape straw to inoculated sludge was 1:2) and 150mL of distilled water, the total working volume of the fermentation bottle is about 400mL, the initial pH value is 7.0, in order to avoid acidification during the start-up period, 1g of sodium bicarbonate is added to provide a buffer, the amount of biochar added is 2.5g, and the amount of ethanol added is 1.5mL; Carry out anaerobic fermentation, and the anaerobic fermentation temperature is set at 37°C. During the experiment, the biogas production was measured by the drainage method every 12 hours, and the biogas was collected with a gas collection...

Embodiment 2

[0047] Using the method of Example 1, the effect of adding ethanol alone for anaerobic fermentation was investigated.

[0048] 1. Pretreatment

[0049] Rapeseed straw was pretreated with 1% NaOH solution at 60°C for 48 hours, and the liquid-solid ratio was 10mL / g.

[0050] 2. Anaerobic fermentation experiment

[0051] Anaerobic fermentation was carried out in a 500 mL fermentation bottle. 8 g of pretreated rape straw was added to 240 g of fresh inoculated sludge (TS was 6.67%, VS was 4.71%; the dry mass ratio of rape straw to inoculated sludge was 1:2) and 150mL of distilled water, the total working volume of the fermentation bottle is about 400mL, and the initial pH value is 7.0. In order to avoid acidification during the start-up period, 1g of sodium bicarbonate is added to provide a buffer, and nitrogen is introduced for anaerobic fermentation. The anaerobic fermentation temperature is set at 37°C. The time is 20 days. In order to study the effect of ethanol addition on ...

Embodiment 3

[0058] Using the method of Example 1, the effect of adding biological carbon anaerobic fermentation alone was investigated.

[0059] 1. Pretreatment

[0060] Rapeseed straw was pretreated with 1% NaOH solution at 60°C for 48 hours, and the liquid-solid ratio was 10mL / g.

[0061] 2. Anaerobic fermentation experiment

[0062] Anaerobic fermentation was carried out in a 500 mL fermentation bottle. 8 g of pretreated rape straw was added to 240 g of fresh inoculated sludge (TS was 6.67%, VS was 4.71%; the dry mass ratio of rape straw to inoculated sludge was 1:2) and 150mL of distilled water, the total working volume of the fermentation bottle is about 400mL, and the initial pH value is 7.0) During the start-up period, in order to avoid acidification, 1g of sodium bicarbonate was added to provide a buffer, and nitrogen gas was introduced for anaerobic fermentation. The time is 20 days. In order to study the effect of biochar addition on the biogas fermentation potential of rapes...

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Abstract

The invention discloses a method for promoting the yield of methane produced by straw anaerobic fermentation through ethanol and biochar and application of the method, according to the method, rape straw is used as a fermentation substrate, ethanol and biochar are added, and methane is efficiently produced under the combined action of ethanol and biochar. According to the invention, the pretreated rape straw is uniformly mixed with ethanol and biochar according to a certain proportion for anaerobic fermentation, so that more methane gas with higher value can be obtained with lower value, the straw is subjected to effective resourceful treatment, the utilization efficiency of biomass resources is improved, and the cost is reduced. Most importantly, the efficiency of methane production through straw anaerobic fermentation is greatly improved, and the methane yield of the method can be improved by 344.4% compared with that of a control group.

Description

technical field [0001] The invention belongs to biological fermentation, and in particular relates to a method and application of ethanol combined with biochar to promote the methane production of straw anaerobic fermentation. Background technique [0002] There are abundant crop straw resources in the world, but the status quo of its treatment and utilization is not good, which not only causes certain environmental pollution, but also poses certain hidden dangers to safety. Many farmers burn straw. Although it is economical and convenient, it will produce air pollutants such as PM2.5, carbon monoxide, and nitrogen oxides. Straw contains nutrients such as organic matter, nitrogen, phosphorus, and potassium. Anaerobic fermentation is adopted, and anaerobic microorganisms are used to decompose and metabolize crop straw to make it resource-friendly and harmless. The biogas residue after fermentation can also be used as a soil improver to promote crop growth, replace some chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12N1/38
CPCC12P5/023C12N1/38C12P2201/00C12P2203/00Y02E50/30
Inventor 王殿龙辛娅时号李相前刘闻远陈春保
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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