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MEC research in electrode, membrane. BACKGROUND Microbial electrolysis cell (MEC) has been widely reported as an efficient strategy to e...

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System
MEC

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Abstract

BACKGROUND Microbial electrolysis cell (MEC) has been widely reported as an efficient strategy to enhance anaerobic digestion. However, the role of MEC during acidogenesis for treatment of sulfate-containing wastes remains unclear as so far. In this study a pair of electrodes was placed into an acidogennic reactor to form a MEC-based acidogenesis to investigate its performance in sulfate-containing wastewater treatment. RESULTS MEC obviously improved anaerobic acidogenesis to treat sulfate-containing wastewater. Higher COD removal and sulfate reduction were obtained in the MEC-based acidogenesis even under high sulfate loading conditions. MEC accelerated the conversion of substrate to acetate, indicationg the acidogenesis was enhanced. From Fluorescence in situ hybridization (FISH) analysis, exoelectrogenic bacteria were enriched in anodic biofilm. CONCLUSION The syntrophic metabolism between anodic exoelectrogenic bacteria and anaerobic fermentative bacteria enriched might accelerate the anodic decomposition of complex substrates as well as cathodic sulfate reduction, then providing a positive environment for sulfate reduction during acidogenesis.

Keywords

AcidogenesisSulfate-reducing bacteriaSulfateMicrobial electrolysis cellMicrobial fuel cellWastewater

Identifiers

DOI
10.1002/JCTB.5414
Journal
Journal of Chemical Technology & Biotechnology
Year
2018