title: Multi-system Nernst-Michaelis-Menten model applied to bioanodes formed from sewage sludge.
abstract: Bioanodes were formed under constant polarization at -0.2 V/SCE from fermented sewage sludge. Current densities reached were 9.3±1.2 A m(-2) with the whole fermented sludge and 6.2±0.9 A m(-2) with the fermented sludge supernatant. The bioanode kinetics was analysed by differentiating among the contributions of the three redox systems identified by voltammetry. Each system ensured reversible Nernstian electron transfer but around a different central potential. The global overpotential required to reach the maximum current plateau was not imposed by slow electron transfer rates but was due to the potential range covered by the different redox systems. The microbial communities of the three bioanodes were analysed by 16S rRNA gene pyrosequencing. They showed a significant microbial diversity around a core of Desulfuromonadales, the proportion of which was correlated with the electrochemical performance of the bioanodes.
authors.affiliation: Laboratoire de Génie Chimique, CNRS - Université de Toulouse, 4 allée Emile Monso, 31432 Toulouse, France. Electronic address: mickael.rimboud@univ-perp.fr.
authors.forename: Mickaël
authors.initials: M
authors.lastname: Rimboud
authors.affiliation: IRSTEA-Unité de Recherche Hydrosystèmes et Bioprocédés, 1 rue Pierre-Gilles de Gennes, CS 10030, 92761 Antony, France.
authors.forename: Elie
authors.initials: E
authors.lastname: Desmond-Le Quemener
authors.affiliation: Laboratoire de Génie Chimique, CNRS - Université de Toulouse, 4 allée Emile Monso, 31432 Toulouse, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Erable
authors.affiliation: IRSTEA-Unité de Recherche Hydrosystèmes et Bioprocédés, 1 rue Pierre-Gilles de Gennes, CS 10030, 92761 Antony, France.
authors.forename: Théodore
authors.initials: T
authors.lastname: Bouchez
authors.affiliation: Laboratoire de Génie Chimique, CNRS - Université de Toulouse, 4 allée Emile Monso, 31432 Toulouse, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Bergel
mesh_terms: D001419:Bacteria / Q000378:metabolism; D044822:Biodiversity; D001674:Bioelectric Energy Sources; D004560:Electricity; D055664:Electrochemical Techniques; D004566:Electrodes; D005232:Fatty Acids, Volatile / Q000032:analysis; D007700:Kinetics; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D012722:Sewage
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage
keywords: Bioanode; Electrochemical kinetics; Microbial fuel cell; Pyrosequencing; Sewage sludge