MESSAI.iO

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70% confidence

Microbial electrosynthesis (MES) biogas upgrading is done via reduction of carbon dioxide to methane through electroactive microbial catalysis. The baseline MES mode of operation showed about a 39% increase in the methane production rate compared to the open circuit mode of operation.

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Literature priors

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Distribution

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Coulombic efficiency100%

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What they did

System
MES

What worked

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Abstract

Microbial electrosynthesis (MES) biogas upgrading is done via reduction of carbon dioxide to methane through electroactive microbial catalysis. The baseline MES mode of operation showed about a 39% increase in the methane production rate compared to the open circuit mode of operation. MES is capable of producing acetic acid at relatively more negative potential (−0.80 to –0.90 V vs. Standard Hydrogen Electrode (SHE)) than the potential at which it produces methane (−0.65 V vs. SHE). The optimum pH for enhancing the electroactive acetogens is found to be around 6.8–7.0 while a pH of around 7.0–7.5 enhances the electroactive methanogens performance. The biocathode adaptation test reveals that 45% of the methane was produced through the electrochemical pathway with a coulombic efficiency of 100% while maintaining heterotrophic efficiency above 99%.

Key findings

  • The baseline MES mode of operation showed about a 39% increase in the methane production rate compared to the open circuit mode of operation.
  • 0 while a pH of around 7.
  • The biocathode adaptation test reveals that 45% of the methane was produced through the electrochemical pathway with a coulombic efficiency of 100% while maintaining heterotrophic efficiency above 99%.

Keywords

MethaneFaraday efficiencyHydrogen productionElectrosynthesisHeterotrophElectrochemistry

Identifiers

DOI
10.3390/catal9080683
Journal
Catalysts
Year
2019