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Oxygen-reducing bidirectional microbial electrodes designed in real domestic wastewater

Hoareau, Morgane and Erable, Benjamin and Chapleur, Olivier and Midoux, Cédric and Bureau, Chrystelle and Goubet, Anne and Bergel, Alain Oxygen-reducing bidirectional microbial electrodes designed in real domestic wastewater. (2021) Bioresource Technology, 326. 124663. ISSN 0960-8524

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Official URL: https://doi.org/10.1016/j.biortech.2021.124663

Abstract

Microbial electrodes were designed in domestic wastewaters to catalyse the oxidation of organic matter (anode) and the reduction of oxygen (cathode) alternately. The successive aeration phases (cathode) enhanced the anodic efficiency, resulting in current densities of up to 6.4 Am-2 without the addition of any substrate. Using nitrogen during the anodic phases affected the microbial populations and the electrodes showed a lower ability to subsequently turn to O2 reduction than the microbial anodes formed in open-to-air conditions did. No strong difference was observed between internal and external biofilm, both of which showed a very large variety of taxa in terms of abundance as well as variance. They comprised a mix of aerobic and anaerobic species, many of which have already been identified separately in bioelectrochemical systems. Such a large diversity, which had not been observed in aerobic bidirectional bioelectrodes so far, can explain the efficiency and robustness observed here. Keywords: Electroactive biofilm; Bioanode; Microbial snorkel; Microbial Fuel Cell; Microbial population.

Item Type:Article
HAL Id:hal-03129147
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Agence Nationale de la Recherche (FRANCE)
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Deposited On:09 Feb 2021 10:00

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