Influence of two polarization potentials on a bioanode microbial community isolated from a hypersaline coastal lagoon of the Yucatan peninsula, in México

• Published in: The Science of the total environment 2019-09, Vol.681, p.258-266
• Main Authors: Tapia-Tussell, Raul, Valle-Gough, Raul E., Peraza-Baeza, Isaías, Domínguez-Maldonado, Jorge, Gonzalez-Muñoz, Muriel, Cortes-Velazquez, Alberto, Leal-Baustista, Rosa M., Alzate-Gaviria, Liliana
• Format: Article
• Language: English
• Subjects: Extracellular electron transfer; Halotolerant bioanode; Microbial fuel cell
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2019.05.120

In recent years, halotolerant biofilms have become a subject of interest for its application in Bioelectrochemical systems for wastewater treatment. To determine if the polarization potential affects the microbial community of a halotolerant bioanode, four bioanodes were poised at potentials of +0.34 V/SHE and − 0.16 V/SHE and the 16S rRNA gene was analyzed through a MiSeq (Ilumina) system. Oceanospirillum, Halomonas and Marinobacterium were the most predominant genus; no previous studies have reported the presence of Oceanospirillum in anodic biofilms. The fitness with the dataset for +0.34 V/SHE with a modified Butler Volmer Monod model, gives a value of K1 was 0.0002 (2.64 A m−2 and 38% coulombic efficiency), indicating the fastest electrochemical reaction. Whereas that −0.16 V/SHE case, the high value of K1 (12.2 with 1.82 A m−2 and 10% coulombic efficiency) indicated that the electron transfer was far from being reversible (Nernstian). [Display omitted] •Polarization potential affects the microbial community of a halotolerant bioanode.•Metabolic pathway and electron flow revealed direct extracellular electron transfer.•Electron transfer rate to anode limits ARB activity rather than metabolic reactions.