MESSAI.iO

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A 15-liter ME-ME reactor was designed and operated to produce organic molecules through microbial electrosynthesis, achieving a COD removal rate of 0.83 g day⁻¹ L⁻¹ and an anodic coulombic efficiency of 98.6%.

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Literature priors

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Reported parameters

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Coulombic efficiency8.6%

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What they did

System
MES
Substrate
pure compound

What worked

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Abstract

Abstract Recent development of microbial electrochemical technologies has allowed microbial electrosynthesis (MES) of organic molecules with microbial electrolysis cell treating waste organic matter. An electrolytic cell with a MES cathode (ME-ME cell) can produce soluble organic molecules with higher market price than biomethane, and thus satisfy both economic and environmental interest. However, the sustainability of bioanode activity could become a major concern. In this work, a 15-liter ME-ME reactor was designed with specific electrode configurations. An electrochemical model was established to assess the feasibility and possible performance of the design, considering the “aging” effect of the bioanode. The reactor was then built and operated for performance evaluation as well as bioanode regeneration assay. Biowaste from an industrial deconditioning platform was used as substrate for bioanode. The COD removal rate in the anodic chamber reached 0.83 g day -1 L -1 of anolyte and the anodic coulombic efficiency reached 98.6%. Acetate was produced with a rate of 0.53 g day -1 L -1 of catholyte, reaching a maximum concentration of 8.3 g L -1 . A potential difference was applied between the bioanode and biocathode independent of reference electrodes. The active biocathode was dominated by members of the Genus Pseudomonas , rarely reported so far for MES activity.

Key findings

  • A 15-liter ME-ME reactor was designed with specific electrode configurations and an electrochemical model was established to assess its feasibility.
  • The reactor was operated for performance evaluation and bioanode regeneration assay, achieving a COD removal rate of 0.83 g day⁻¹ L⁻¹ and an anodic coulombic efficiency of 98.6%.
  • Acetate was produced at a rate of 0.53 g day⁻¹ L⁻¹, and the sustainability of bioanode activity was identified as a major concern.

Keywords

Microbial electrolysis cellElectrolysisAnodeFaraday efficiencyMicrobial fuel cellCathode

Identifiers

DOI
10.1101/609909
Journal
bioRxiv (Cold Spring Harbor Laboratory)
Year
2019