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Treatment method for improving performance of producing methane through anaerobic fermentation of straw and application thereof

A technology of anaerobic fermentation and treatment method, applied in fermentation, waste fuel, etc., can solve the problems of refractory degradation and high pretreatment cost

Pending Publication Date: 2021-04-30
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that crop straws are difficult to degrade and the cost of pretreatment is high during anaerobic fermentation, the present invention proposes an environmentally friendly, simple and efficient method for pretreatment of agricultural and forestry wastes

Method used

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  • Treatment method for improving performance of producing methane through anaerobic fermentation of straw and application thereof
  • Treatment method for improving performance of producing methane through anaerobic fermentation of straw and application thereof
  • Treatment method for improving performance of producing methane through anaerobic fermentation of straw and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Raw material handling

[0042] The air-dried corn stalks are first cut into 3-4 cm, then pulverized with a pulverizer, passed through a 20-mesh sieve, and dried and stored for later use.

[0043] The biogas slurry is obtained from the mesophilic anaerobic fermentation of corn stalks and cow dung (the TS ratio of corn stalks and cow dung is 1:1, the TS ratio of fermented material and inoculated sludge is 1:1, and the total TS of the fermenter is 8%) after 40 days. part.

[0044] Preparation method of fermented acid solution: corn stalks and inoculated sludge passed through a 20-mesh sieve were subjected to mesophilic anaerobic fermentation with a TS ratio of 3:2, the total TS of the fermenter was 16%, and the concentration of VFAs was monitored once a day to select At the peak time of acid production, the fermentation broth was taken out on the 7th day.

[0045] Table 2 shows the measurement results of basic indicators of biogas slurry and fermented acid solution. ...

Embodiment 2

[0056] (1) Raw material handling

[0057] The air-dried corn stalks are first cut into 3-4 cm, then pulverized with a pulverizer, passed through a 20-mesh sieve, and dried and stored for later use.

[0058] (2) Pretreatment method

[0059] The crushed corn stalks were immersed in 1% sulfuric acid, 1% phosphoric acid, 1% acetic acid, 1% propionic acid, 1% butyric acid (both volume ratio) at room temperature (25°C) for 5 hours, and the solid-to-liquid ratio was 1: 10. The impregnated corn stalks were filtered, and the resulting liquid was continued to be used as an impregnating liquid, and the solid was disc-grinded 8 times with a disc mill at a rotational speed of 2800 r / min.

[0060] (3) Anaerobic fermentation

[0061] The pretreated solids and inoculated sludge were fed into fermentors at a ratio of 1:2 (based on TS), and distilled water was added to each fermenter to adjust the total TS to 6%. The initial pH of each fermentor was adjusted to 7.0 ± 0.1 with NaOH solution....

Embodiment 3

[0065] (1) Raw material handling

[0066] The air-dried corn stalks are first cut into 3-4 cm, then pulverized with a pulverizer, passed through a 20-mesh sieve, and dried and stored for later use.

[0067] (2) Pretreatment method

[0068] The crushed corn stover was immersed in 0.5% acetic acid, 2% acetic acid and 4% acetic acid at room temperature (25 °C) for 5 hours, with a solid-to-liquid ratio of 1:10. The impregnated corn stalks were filtered, and the resulting liquid was continued to be used as an impregnating liquid, and the solid was disc-grinded 8 times with a disc mill at a rotational speed of 2800 r / min. A control group of disc grinding only and 1% acetic acid immersion only was set up.

[0069] (3) Anaerobic fermentation

[0070] The pretreated solids and inoculated sludge were fed into fermentors at a ratio of 1:2 (based on TS), and distilled water was added to each fermenter to adjust the total TS to 6%. The initial pH of each fermentor was adjusted to 7.0 ±...

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Abstract

The invention belongs to the technical field of preparation of biogas through anaerobic fermentation and conversion of organic solid waste, and particularly relates to a treatment method for improving the performance of producing methane through anaerobic fermentation of straw and application thereof. Aiming at the problems that crop straws are difficult to degrade in the anaerobic fermentation process and the pretreatment cost is high, the invention provides an environment-friendly, simple, convenient and efficient forestry and agricultural residue pretreatment method. According to the method, acid liquor generated in the crop straw anaerobic fermentation acidification process is used for replacing traditional acid chemical reagents, raw materials are dippedand swelled, then a mechanical disc mill with low energy consumption is combined to pretreat the biomass raw materials, the complex structure of lignocellulose biomass can be effectively damaged, the cellulose crystallinity is reduced, the porosity of the raw materials is improved, and the gas production efficiency of the biomass is improved. According to the method, an anaerobic fermentation process and a biomass pretreatment process are combined, a new way is provided for efficient conversion of biomass resources to prepare the biogas, and the method has important significance for development of biogas engineering.

Description

technical field [0001] The invention belongs to the technical field of anaerobic fermentation conversion of organic solid waste to produce bio-natural gas, and in particular relates to a treatment method for improving the methane production performance of straw anaerobic fermentation and its application. Background technique [0002] Lignocellulosic biomass, as the largest renewable organic resource on earth, has great potential in producing sustainable energy. Making full use of lignocellulose resources can reduce the dependence of human society on petrochemical resources and alleviate the current severe resource and environmental crisis. According to statistics from the Bureau of Statistics, in 2019, the output of crop straw in my country was about 863 million tons, and the output of corn straw was 284 million tons. These straws are usually directly discarded in the field or burned on site, causing huge environmental pollution and waste of biological resources. Therefore...

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 朱万斌王洪亮马帅帅
Owner CHINA AGRI UNIV
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