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Author Gacitua, M.A.; Munoz, E.; Gonzalez, B.
Title Bioelectrochemical sulphate reduction on batch reactors: Effect of inoculum-type and applied potential on sulphate consumption and pH Type
Year 2018 Publication Bioelectrochemistry Abbreviated Journal Bioelectrochemistry
Volume 119 Issue Pages 26-32
Keywords Biocathode potential control; Bioelectrochemical sulphate reduction; Desulfobacter halotolerans; Sulphate reducing bacterial consortium
Abstract Microbial electrolysis batch reactor systems were studied employing different conditions, paying attention on the effect that biocathode potential has on pH and system performance, with the overall aim to distinguish sulphate reduction from H-2 evolution. Inocula from pure strains (Desulfovibrio paquesii and Desulfobacter halotolerans) were compared to a natural source conditioned inoculum. The natural inoculum possess the potential for sulphate reduction on serum bottles experiments due to the activity of mutualistic bacteria (Sedimentibacter sp. and Bacteroides sp.) that assist sulphate-reducing bacterial cells (Desulfovibrio sp.) present in the consortium. Electrochemical batch reactors were monitored at two different potentials (graphite-bar cathodes poised at -900 and -400mV versus standard hydrogen electrode) in an attempt to isolate bioelectrochemical sulphate reduction from hydrogen evolution. At -900mV all inocula were able to reduce sulphate with the consortium demonstrating superior performance (SO42- consumption: 25.71 g m(-2) day(-1)), despite the high alkalinisation of the media. At -400mV only the pure Desulfobacter halotolerans inoculated system was able to reduce sulphate (SO42- consumption: 17.47 g m(-2) day(-1)) and, in this potential condition, pH elevation was less for all systems, confirming direct (or at least preferential) bioelectrochemical reduction of sulphate over H-2 production. (c) 2017 Elsevier B.V. All rights reserved.
Address [Gacitua, Manuel A.; Munoz, Enyelbert; Gonzalez, Bernardo] Univ Adolfo Ibanez, Ctr Appl Ecol & Sustainabil CAPES, Fac Ingn & Ciencias, Lab Bioingn, Santiago, Chile, Email: mgacitua.pdc@uai.cl
Corporate Author Thesis
Publisher Elsevier Science Sa Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1567-5394 ISBN Medium (down)
Area Expedition Conference
Notes WOS:000418312300004 Approved
Call Number UAI @ eduardo.moreno @ Serial 778
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