title: Comparison of synthetic medium and wastewater used as dilution medium to design scalable microbial anodes: Application to food waste treatment.
abstract: The objective was to replace synthetic medium by wastewater as a strategy to design low-cost scalable bioanodes. The addition of activated sludge was necessary to form primary bioanodes that were then used as the inoculum to form the secondary bioanodes. Bioanodes formed in synthetic medium with acetate 10mM provided current densities of 21.9±2.1A/m(2), while bioanodes formed in wastewater gave 10.3±0.1A/m(2). The difference was explained in terms of biofilm structure, electrochemical kinetics and redox charge content of the biofilms. In both media, current densities were straightforwardly correlated with the biofilm enrichment in Geobacteraceae but, inside this family, Geobacter sulfurreducens and an uncultured Geobacter sp. were dominant in the synthetic medium, while growth of another Geobacter sp. was favoured in wastewater. Finally, the primary/secondary procedure succeeded in designing bioanodes to treat food wastes by using wastewater as dilution medium, with current densities of 7±1.1A/m(2).
authors.affiliation: Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France. Electronic address: blanchet.elise@gmail.com.
authors.forename: Elise
authors.initials: E
authors.lastname: Blanchet
authors.affiliation: Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France.
authors.forename: Elie
authors.initials: E
authors.lastname: Desmond
authors.affiliation: Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Erable
authors.affiliation: Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Bridier
authors.affiliation: Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France.
authors.forename: Théodore
authors.initials: T
authors.lastname: Bouchez
authors.affiliation: Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Bergel
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology; D004566:Electrodes / Q000382:microbiology; D004572:Electrolysis / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D019649:Food Industry / Q000379:methods; D005516:Food Microbiology; D045302:Geobacter / Q000502:physiology*; D007220:Industrial Waste / Q000517:prevention & control; D014865:Waste Disposal, Fluid / Q000295:instrumentation*; D062065:Wastewater / Q000382:microbiology*
chemical_list: D007220:Industrial Waste; D062065:Wastewater
keywords: Bioanode; Bioelectrochemical system; Food waste; Geobacteraceae; Wastewater