title: The effect of anode potential on bioelectrochemical and electrochemical tetrathionate degradation.
abstract: The effect of poised anode potential on electricity production and tetrathionate degradation was studied in two-chamber flow-through electrochemical (ES) and bioelectrochemical systems (BES). The minimum anode potential (vs. Ag/AgCl) for positive current generation was 0.3V in BES and 0.5V in the abiotic ES. The anode potential required to obtain average current density above 70mAm-2was 0.4V in BES and above 0.7V in ES. ES provided higher coulombic efficiency, but the average tetrathionate degradation rate remained significantly higher in BES (above 110mgL-1d-1) than in the abiotic ES (below 35mgL-1d-1). This study shows that at anode potentials below 0.7V, the electrochemical tetrathionate degradation is only efficient with microbial catalyst and that significantly higher tetrathionate degradation rates can be obtained with bioelectrochemical systems than with electrochemical systems at the tested anode potentials.
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland. Electronic address: mira.sulonen@tut.fi.
authors.forename: Mira L K
authors.initials: MLK
authors.lastname: Sulonen
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland.
authors.forename: Aino-Maija
authors.initials: AM
authors.lastname: Lakaniemi
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland.
authors.forename: Marika E
authors.initials: ME
authors.lastname: Kokko
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland.
authors.forename: Jaakko A
authors.initials: JA
authors.lastname: Puhakka
mesh_terms: D001674:Bioelectric Energy Sources; D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D013776:Tetrathionic Acid / Q000737:chemistry*
chemical_list: D013776:Tetrathionic Acid
keywords: Anode potential; Bioelectrochemical cell; Current generation; Electrochemical cell; Tetrathionate