Role of sulfur during acetate oxidation in biological anodes

Dutta, Paritam K., Keller, Jurg, Yuan, Zhiguo, Rozendal, Rene A. and Rabaey, Korneel (2009) Role of sulfur during acetate oxidation in biological anodes. Environmental Science and Technology, 43 10: 3839-3845. doi:10.1021/es803682k


Author Dutta, Paritam K.
Keller, Jurg
Yuan, Zhiguo
Rozendal, Rene A.
Rabaey, Korneel
Title Role of sulfur during acetate oxidation in biological anodes
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2009-05-01
Year available 2009
Sub-type Article (original research)
DOI 10.1021/es803682k
Volume 43
Issue 10
Start page 3839
End page 3845
Total pages 7
Editor Jerald Schnoor
Place of publication Washington, D.C., U.S.
Publisher American Chemical Society
Language eng
Subject C1
Abstract The treatment of wastewater containing sulfides in bioelectrochemical systems (BES) causes deposition of sulfur on the anode as a result of a solely electrochemical process. In this study, we investigate whether microorganisms can use this sulfur, rather than the anode or soluble sulfate, as an electron acceptor for the oxidation of acetate. Our results indicate that microorganisms use electrodeposited sulfur as preferable electron acceptor over the anode and sulfate and produce sulfide irrespective of electrochemical conditions. Bioelectrochemical and biological sulfide generation pathways were studied under different electrochemical conditions. The obtained results show that the sulfide generation rate at open circuit condition (anode potential −235 ± 5 mV versus standard hydrogen electrode, SHE) was higher in comparison to the electrochemical sulfide generation even at a lower potential of −275 mV (vs SHE), confirming that sulfide is produced through biological processes without any current generation. However, during closed circuit operation, the overall Coulombic efficiency (97% ± 2%) is not affected as the produced sulfide (originating from the reduction of deposited sulfur) is spontaneously reoxidized to sulfur when a favorable potential is maintained. This confirms the mediator role of sulfur during acetate oxidation in BES. A diagrammatic representation of the mechanism is proposed to characterize the interactions between acetate oxidation and sulfur conversions on the anode.
Keyword Acetate oxidation
Biological anodes
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 03 Sep 2009, 18:10:10 EST by Mr Andrew Martlew on behalf of Advanced Water Management Centre