Developing “precise-acting” strategies for improving anaerobic methanogenesis of organic waste: Insights from the electron transfer system of syntrophic partners

Abstract

Methanogenesis is the last step in anaerobic digestion, which is usually a rate-limiting step in the biological treatment of organic waste. The low methanogenesis efficiency (low methane production rate, low methane yield, low methane content) substantially limits the development of anaerobic digestion technology. Traditional pretreatment methods and bio-stimulation strategies have impacts on the entire anaerobic system and cannot directly enhance methanogenesis in a targeted manner, which was defined as “broad-acting” strategies in this perspective. Further, we discussed our opinion of methanogenesis process with insights from the electron transfer system of syntrophic partners and provided potential targeted enhancing strategy for high-efficiency electron transfer system. These “precise-acting” strategies are expected to achieve an efficient methanogenesis process and enhance the bio-energy recovery of organic waste.

Graphical abstract

Keywords

Methanogenesis / Anaerobic digestion / Enhancing strategy / Electron transfer / Organic waste

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51538008), the National Key Research and Development Program of China (Grant No. 2020YFC-1908700), and the Shanghai Committee (No. 19DZ1204906).

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