Elucidating the impact of power interruptions on microbial electromethanogenesis

Guillermo Pelaz, Rubén González, Antonio Morán and Adrián Escapa

Applied Energy, 2023, vol. 331, issue C, No S0306261922016397

Abstract: The need to accommodate power fluctuations intrinsic to high-renewable systems will demand in the future the implementation of large quantities of energy storage capacity. Microbial electromethanogenesis (EM) can potentially absorb the excess of renewable energy and store it as CH₄. However, it is still unknown how power fluctuations impact on the performance of EM systems. In this study, power gaps from 24 to 96 h were applied to two 0.5 L EM reactors to assess the effect of power interruptions on current density, methane production and current conversion efficiency. In addition, the cathodes were operated with and without external H₂ supplementation during the power-off periods to analyse how power outages affect the two main metabolic stages of the EM (i.e.: the hydrogenic and methanogenic steps).

Keywords: Electromethanogenesis; Power-to-gas; Hydrogen; Methane; Biocathode (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1016/j.apenergy.2022.120382

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