Biogas fermentation carbon reduction method for carbon dioxide internal circulation

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....

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

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