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Successive bioanode regenerations to maintain efficient current production from biowaste

Bridier, Arnaud and Desmond-Le Quéméner, Elie and Bureau, Chrystelle and Champigneux, Pierre and Renvoisé, Laure and Audic, Jean-Marc and Blanchet, Elise and Bergel, Alain and Bouchez, Théodore Successive bioanode regenerations to maintain efficient current production from biowaste. (2015) Bioelectrochemistry, 106. 133-140. ISSN 1567-5394

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Official URL: https://doi.org/10.1016/j.bioelechem.2015.05.007

Abstract

The long-term operation of efficient bioanodes supplied with waste-derived organics is a key challenge for using bioelectrochemical systems as a waste valorization technology. Here, we describe a simple procedure that allowed maintaining highly efficient bioanodes supplied with biowaste. Current densities up to 14.8 A/m2 were obtained with more than 40% of the electrons introduced as biowaste being recovered in the electrical circuit. Three fed-batch reactors were started at different biowaste loading rates. A decline of coulombic efficiencies between 22 and 31% was recorded depending on the reactor over the first 3 weeks of operation. A renewal procedure of the anode was thereafter implemented, which led to a recovery of initial performances. The second and the third renewal, allowed maintaining stable high level performances with coulombic efficiency of approximately 40% over at least 3 weeks. Electroactive biofilm dynamics were monitored using 16S rRNA-gene amplicon sequencing. Retrieved sequences were dominated by Geobacter sulfurreducens-related reads (37% of total sequences), which proportion however varied along the experiment. Interestingly, sequences affiliated to various Bacteroidetes groups were also abundant, suggesting an adaptation of the anodic biofilm to the degradation of biowaste through metabolic interactions between microbial community members.

Item Type:Article
HAL Id:hal-01608538
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 - INPT (FRANCE)
French research institutions > Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > SUEZ ENVIRONNEMENT (FRANCE)
Laboratory name:
Funders:
Agence Nationale de la Recherche
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Deposited By: Loetitia MOYA
Deposited On:31 Jan 2019 15:27

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