Correlation of the Electrochemical Kinetics of High‐Salinity‐Tolerant Bioanodes with the Structure and Microbial Composition of the Biofilm. Issue 11 (12th August 2014)

• Record Type: Journal Article
• Authors: Rousseau, Raphael; Santaella, Catherine; Achouak, Wafa; Godon, Jean‐Jacques; Bonnafous, Anaïs; Bergel, Alain; Délia, Marie‐Line
• Is Part Of: ChemElectroChem. Volume 1:Issue 11(2014)
• Page Start: 1966
• Page End: 1975
• Publication Date: 2014-08-12
• Subjects: Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201402153
• Languages: English
• ISSNs: 2196-0216

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Increasing the conductivity of the electrolytes used in microbial electrochemical systems is an essential prerequisite to large‐scale application of these technologies. Microbial anodes formed on carbon felt from a salt marsh inoculum under polarisation at 0.1 V (versus a saturated calomel electrode), generated up to 85 A m⁻² in media that contained 30–45 g L⁻¹ of NaCl. Analyses of microbial populations showed a stringent selection of the two microbial genera <italic>Marinobacter</italic> and <italic>Desulfuromonas</italic>. Currents decreased if NaCl concentration was increased to 60 g L⁻¹. This highest salinity was shown to consistently impact the bioanode performance in three ways: voltammetry indicated degraded electron‐transfer kinetics, confocal laser scanning microscopy showed a modified biofilm structure and DNA pyrosequencing detected a decrease in the level of <italic>Desulfuromonas</italic> spp. relative to <italic>Marinobacter</italic> spp. A consistent correlation was, thus, found between electrochemical kinetics, biofilm structure and the composition of the microbial community.</p> </abstract>