Dataset Information

Hydrogen peroxide production in a pilot-scale microbial electrolysis cell.

ABSTRACT: A pilot-scale dual-chamber microbial electrolysis cell (MEC) equipped with a carbon gas-diffusion cathode was evaluated for H₂O₂ production using acetate medium as the electron donor. To assess the effect of cathodic pH on H₂O₂ yield, the MEC was tested with an anion exchange membrane (AEM) and a cation exchange membrane (CEM), respectively. The maximum current density reached 0.94-0.96?A/m² in the MEC at applied voltage of 0.35-1.9?V, regardless of membranes. The highest H₂O₂ conversion efficiency was only 7.2?±?0.09% for the CEM-MEC. This low conversion would be due to further H₂O₂ reduction to H₂O on the cathode or H₂O₂ decomposition in bulk liquid. This low H₂O₂ conversion indicates that large-scale MECs are not ideal for production of concentrated H₂O₂ but could be useful for a sustainable in-situ oxidation process in wastewater treatment.

SUBMITTER: Sim J

PROVIDER: S-EPMC6127372 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Hydrogen peroxide production in a pilot-scale microbial electrolysis cell.

Sim Junyoung J Reid Robertson R Hussain Abid A An Junyeong J Lee Hyung-Sool HS

Biotechnology reports (Amsterdam, Netherlands) 20180801

A pilot-scale dual-chamber microbial electrolysis cell (MEC) equipped with a carbon gas-diffusion cathode was evaluated for H2O2 production using acetate medium as the electron donor. To assess the effect of cathodic pH on H2O2 yield, the MEC was tested with an anion exchange membrane (AEM) and a cation exchange membrane (CEM), respectively. The maximum current density reached 0.94-0.96 A/m2 in the MEC at applied voltage of 0.35-1.9 V, regar ...[more]

PMID: 30197872

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Project description:A hydrogen utilizing exoelectrogenic bacterium (Geobacter sulfurreducens) was compared to both a nonhydrogen oxidizer (Geobacter metallireducens) and a mixed consortium in order to compare the hydrogen production rates and hydrogen recoveries of pure and mixed cultures in microbial electrolysis cells (MECs). At an applied voltage of 0.7 V, both G. sulfurreducens and the mixed culture generated similar current densities (ca. 160 A/m3), resulting in hydrogen production rates of ca. 1.9 m(3) H2/m3/day, whereas G. metallireducens exhibited lower current densities and production rates of 110 +/- 7 A/m3 and 1.3 +/- 0.1 m3 H2/m3/day, respectively. Before methane was detected in the mixed-culture MEC, the mixed consortium achieved the highest overall energy recovery (relative to both electricity and substrate energy inputs) of 82% +/- 8% compared to G. sulfurreducens (77% +/- 2%) and G. metallireducens (78% +/- 5%), due to the higher coulombic efficiency of the mixed consortium. At an applied voltage of 0.4 V, methane production increased in the mixed-culture MEC and, as a result, the hydrogen recovery decreased and the overall energy recovery dropped to 38% +/- 16% compared to 80% +/- 5% for G. sulfurreducens and 76% +/- 0% for G. metallireducens. Internal hydrogen recycling was confirmed since the mixed culture generated a stable current density of 31 +/- 0 A/m3 when fed hydrogen gas, whereas G. sulfurreducens exhibited a steady decrease in current production. Community analysis suggested that G. sulfurreducens was predominant in the mixed-culture MEC (72% of clones) despite its relative absence in the mixed-culture inoculum obtained from a microbial fuel cell reactor (2% of clones). These results demonstrate that Geobacter species are capable of obtaining similar hydrogen production rates and energy recoveries as mixed cultures in an MEC and that high coulombic efficiencies in mixed culture MECs can be attributed in part to the recycling of hydrogen into current.

Dataset Information

Hydrogen peroxide production in a pilot-scale microbial electrolysis cell.

Publications

Hydrogen peroxide production in a pilot-scale microbial electrolysis cell.

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