MESSAI.iO

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BES research with standard focus on bioelectrochemical. Abstract Mediated microbial electrosynthesis (MES) represents a promising strategy for t...

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Microbial electrochemical systemRepresentative model
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Representative microbial electrochemical system — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MES
Substrate
pure compound

What worked

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Abstract

Abstract Mediated microbial electrosynthesis (MES) represents a promising strategy for the capture and conversion of CO 2 into carbon-based products. We describe the development and application of a comprehensive multiphysics model to analyze a formate-mediated MES reactor. The model shows that this system can achieve a biomass productivity of ∼1.7 g L -1 hr -1 but is limited by a competitive trade-off between O 2 gas/liquid mass transfer and CO 2 transport to the cathode. Synthetic metabolic strategies are evaluated for formatotrophic growth, which can enable an energy efficiency of ∼21%, a 30% improvement over the Calvin cycle. However, carbon utilization efficiency is only ∼10% in the best cases due to a futile CO 2 cycle, so gas recycle will be necessary for greater efficiency. Finally, separating electrochemical and microbial processes into separate reactors enables a higher biomass productivity of ∼2.4 g L -1 hr -1 . The mediated MES model and analysis presented here can guide process design for conversion of CO 2 into renewable chemical feedstocks.

Keywords

ElectrosynthesisBiomass (ecology)FormateRenewable energyMultiphysicsProductivity

Identifiers

DOI
10.1101/2020.08.31.275537
Journal
bioRxiv (Cold Spring Harbor Laboratory)
Year
2020