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<p>Propionic acid has been reported as a recalcitrant compound that inhibits methane production in digesters as well in microbial electrolysis cells. To study this phenomenon electrochemical cells supplemented with propionate (10 mM) in the anodic chamber were operated at different voltage-biomass content combinations. Biogas and electrical current production, and the volatile fatty acid profile in the anolyte were determined over a 13-day operation period. Biogas was enhanced by the addition of propionate reaching 13.7 mL biogas (L d)<sup>−1</sup> and 300 mL biogas (g volatile solids)<sup>−1</sup>. Current density and electrical charge increased up to 876.7&#xa0;mA m<sup>−2</sup> and 174.3&#xa0;C respectively; the MEC at 1.20&#xa0;V and 40% biomass showed the best performance producing 125.5&#xa0;C from propionate alone. Electron flow was distributed among acetate (34%), methane (22%) and electrical charge (9%). The coproduction of acetate, methane, and electrical charge showed high correlation coefficients ranging from 0.910 to 0.997. These findings expand the potential applications of microbial electrolysis cells for sustainable production in acidogenic fermentation, anaerobic digestion and electrosynthesis.</p> Graphical abstract <p></p>

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Anodic coproduction of acetate, methane and electrical charge from propionate in a microbial electrolysis cell

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Ariadna Segundo-Aguilar,
  • Gabriel Trejo,
  • Fernando F. Rivera,
  • Eligio P. Rivero,
  • Adalberto Noyola,
  • Bibiana Cercado

摘要

Propionic acid has been reported as a recalcitrant compound that inhibits methane production in digesters as well in microbial electrolysis cells. To study this phenomenon electrochemical cells supplemented with propionate (10 mM) in the anodic chamber were operated at different voltage-biomass content combinations. Biogas and electrical current production, and the volatile fatty acid profile in the anolyte were determined over a 13-day operation period. Biogas was enhanced by the addition of propionate reaching 13.7 mL biogas (L d)−1 and 300 mL biogas (g volatile solids)−1. Current density and electrical charge increased up to 876.7 mA m−2 and 174.3 C respectively; the MEC at 1.20 V and 40% biomass showed the best performance producing 125.5 C from propionate alone. Electron flow was distributed among acetate (34%), methane (22%) and electrical charge (9%). The coproduction of acetate, methane, and electrical charge showed high correlation coefficients ranging from 0.910 to 0.997. These findings expand the potential applications of microbial electrolysis cells for sustainable production in acidogenic fermentation, anaerobic digestion and electrosynthesis.

Graphical abstract