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Biogas fermentation carbon reduction method for carbon dioxide internal circulation

A technology for carbon dioxide and biogas fermentation, applied in chemical instruments and methods, biochemical equipment and methods, fermentation, etc., can solve the problems of less attention to carbon dioxide recovery and reuse, increased operating costs, and increased carbon emissions. Improve purity and application range, promote low-carbon production, reduce carbon emissions

Pending Publication Date: 2021-10-15
TIANJIN AGRICULTURE COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current biogas decarbonization technology focuses on the recovery rate of methane, while carbon dioxide is often discharged as waste gas after treatment, and less attention is paid to the recovery and reuse of carbon dioxide
The content of carbon dioxide in biogas (30-50% by volume) is second only to methane. If it cannot be used effectively, it will increase carbon emissions and cause waste of resources
However, as a new way to improve fermentation efficiency, this method needs to consume a large amount of exogenous carbon dioxide, resulting in increased operating costs

Method used

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  • Biogas fermentation carbon reduction method for carbon dioxide internal circulation
  • Biogas fermentation carbon reduction method for carbon dioxide internal circulation

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Embodiment

[0038] Select the anaerobic fermentation reactor, the reactor is a 500L anaerobic bottle, the effective volume is 400mL, the food waste is fermented, the fermentation substrate concentration is 35g-VS / L, the inoculation sludge is 16.5g-VS / L, and the fermentation temperature is 40 ℃, the initial pH value is 7.0, N 2 10min to create anaerobic conditions, batch fermentation. Experimental group: Pass the fermentation gas into a 5mL 1mol / L KOH absorption bottle for excessive absorption to obtain CO 2 Absorption liquid, inject the absorption liquid into the anaerobic fermentation bottle, and mix well. Control group: without CO 2 reflow.

[0039] Starting from the injection of the reflux absorption solution, the methane production rate is determined, see figure 2 . Depend on figure 2 It is known that CO is absorbed by lye 2 After internal reflux, the yield of methane increased by 8%. In the rapid gas production stage and after the gas production tends to be stable, the meth...

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Abstract

The invention relates to a biogas fermentation carbon reduction method for carbon dioxide internal circulation, which is characterized in that biogas prepared by a biogas preparation unit is introduced into a biogas purification and separation unit, methane and carbon dioxide are separated by the biogas purification and separation unit, the separated carbon dioxide gas is introduced into a container filled with a carbon dioxide absorption liquid to generate a KHCO3 solution. The generated KHCO3 solution flows back and is input to the biogas preparation unit. According to the invention, the conversion of carbon dioxide in the biogas fermentation system is realized. The improvement of methane yield and biogas quality is promoted. The method is particularly suitable for CO2 internal circulation of a dry anaerobic fermentation system.

Description

technical field [0001] The invention belongs to the field of resource utilization of organic matter, and relates to a technology for promoting anaerobic fermentation of organic matter to produce methane and deeply reducing the carbon emission of a biogas system, in particular to a method for reducing carbon dioxide by carbon dioxide internal circulation through biogas fermentation. Background technique [0002] Biogas fermentation technology is widely used in the treatment of organic solid waste and high-concentration organic wastewater. Through the metabolism of anaerobic microorganisms, organic components are converted into biomass energy, which is the key to realizing the reduction, stabilization and resource utilization of organic waste. effective way to deal with it. According to the theory of anaerobic fermentation, organic matter is converted into biogas through four stages: hydrolysis, acidification, hydrogen production, acetic acid production and methane production....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/107C12M1/00C12P5/02B01D53/18B01D53/14C10L3/10
CPCC12M21/04C12M29/08C12M47/18C12P5/023B01D53/18B01D53/1475C10L3/104Y02E50/30Y02C20/40Y02P20/59Y02P20/151
Inventor 刘新媛陶君张博马宁孙艳梅
Owner TIANJIN AGRICULTURE COLLEGE
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