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A method to improve the biogas production efficiency of anaerobic digestion of food waste

A technology for kitchen waste and anaerobic digestion, applied in fermentation, waste fuel and other directions, can solve the problems of low methane content in biogas production, and achieve the effects of improving yield and purity, reducing inhibition process and improving efficiency

Active Publication Date: 2022-03-08
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the final biogas yield and its methane content of these processes are still relatively low, and too much attention has been paid to how to improve the hydrogen production potential of anaerobic fermentation

Method used

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  • A method to improve the biogas production efficiency of anaerobic digestion of food waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Inoculate the anaerobic sludge into the pretreated food waste, the inoculation amount of the anaerobic sludge is 15% of the mass of the pretreated food waste, and then the mineralized waste and the pretreated food waste are mixed in a mass ratio of 4:1 Mix and adjust to a moisture content of 85%, then add biochar into the mixture at a concentration of 8g / L. The reaction was carried out in the CSTR anaerobic fermentation tank, and the temperature was controlled at 37° C. with intermittent stirring, and the residence time was 18 days. Biogas production reaches 60m 3 / t, the purity of hydrogen in biogas is 5%, and the purity of methane can reach 80%.

Embodiment 2

[0036] Inoculate the anaerobic sludge into the pretreated food waste, the inoculation amount of the anaerobic sludge is 15% of the mass of the pretreated food waste, and then the mineralized waste and the pretreated food waste are mixed in a mass ratio of 4:1 Mix and adjust to a water content of 85%, and then add biochar into the mixture at a concentration of 10 g / L. The reaction was carried out in the CSTR anaerobic fermentation tank, and the temperature was controlled at 37° C. with intermittent stirring, and the residence time was 18 days. Biogas production reaches 80m 3 / t, the purity of hydrogen in biogas is 6%, and the purity of methane can reach 85%.

Embodiment 3

[0038] Inoculate the anaerobic sludge into the pretreated food waste, the inoculation amount of the anaerobic sludge is 15% of the mass of the pretreated food waste, and then the mineralized waste and the pretreated food waste are mixed at a mass ratio of 3:1 Mix and adjust to a water content of 90%, then add biochar into the mixture at a concentration of 15g / L. The reaction was carried out in the CSTR anaerobic fermentation tank, and the temperature was controlled at 37° C. with intermittent stirring, and the residence time was 18 days. Biogas production reaches 100m 3 / t, the purity of hydrogen in biogas is 8%, and the purity of methane can reach 90%.

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Abstract

The invention provides a method for improving the biogas production efficiency of anaerobic digestion of kitchen waste, the method is to sort the kitchen waste to remove large refractory materials, carry out oil extraction treatment and crushing treatment, and obtain pretreated kitchen waste; After the pretreated kitchen waste is inoculated with anaerobic sludge, it is evenly mixed with mineralized waste, biochar and water to perform anaerobic fermentation treatment. This method improves the biogas yield and purity of anaerobic fermentation of kitchen waste, and the biogas volume reaches 60-100 m 3 / t, the methane content in biogas can reach 80-90%.

Description

technical field [0001] The invention relates to a method for producing biogas by anaerobic fermentation of kitchen waste, in particular to a method for improving the yield and purity of kitchen waste anaerobic digestion biogas, and belongs to the technical field of environmental protection. Background technique [0002] With the continuous improvement of people's living standards, the amount of kitchen waste generated has increased dramatically. Due to the Chinese eating habits, the composition of food waste is extremely complex, with the characteristics of high moisture content and perishable deterioration. If it is not disposed of in time, it will cause great harm to the environment. Anaerobic digestion is a harmless, reduced and resource-based biological treatment technology. The biogas produced by it can be used to generate electricity, and the degree of resource utilization is high. The main components of biogas are methane (55%-65%), carbon dioxide (35%-45%), hydrogen...

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 廖栩尹常凯李昌武史学峰刘杨
Owner 长沙工研院环保有限公司