Advanced search
1 file | 337.97 KB

Role of sulfur during acetate oxidation in biological anodes

(2009) ENVIRONMENTAL SCIENCE & TECHNOLOGY. 43(10). p.3839-3845
Author
Organization
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 electrode posited 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.
Keywords
ELECTRICITY-GENERATION, MICROBIAL FUEL-CELLS, ELECTRON-TRANSFER, SULFIDE, REMOVAL, ENERGY

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 337.97 KB

Citation

Please use this url to cite or link to this publication:

Chicago
Dutta, Paritam K, Jürg Keller, ZhiGuo Yuan, René A Rozendal, and Korneel Rabaey. 2009. “Role of Sulfur During Acetate Oxidation in Biological Anodes.” Environmental Science & Technology 43 (10): 3839–3845.
APA
Dutta, P. K., Keller, J., Yuan, Z., Rozendal, R. A., & Rabaey, K. (2009). Role of sulfur during acetate oxidation in biological anodes. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 43(10), 3839–3845.
Vancouver
1.
Dutta PK, Keller J, Yuan Z, Rozendal RA, Rabaey K. Role of sulfur during acetate oxidation in biological anodes. ENVIRONMENTAL SCIENCE & TECHNOLOGY. 2009;43(10):3839–45.
MLA
Dutta, Paritam K, Jürg Keller, ZhiGuo Yuan, et al. “Role of Sulfur During Acetate Oxidation in Biological Anodes.” ENVIRONMENTAL SCIENCE & TECHNOLOGY 43.10 (2009): 3839–3845. Print.
@article{2009264,
  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 electrode posited 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.},
  author       = {Dutta, Paritam K and Keller, J{\"u}rg and Yuan, ZhiGuo and Rozendal, Ren{\'e} A and Rabaey, Korneel},
  issn         = {0013-936X},
  journal      = {ENVIRONMENTAL SCIENCE \& TECHNOLOGY},
  keyword      = {ELECTRICITY-GENERATION,MICROBIAL FUEL-CELLS,ELECTRON-TRANSFER,SULFIDE,REMOVAL,ENERGY},
  language     = {eng},
  number       = {10},
  pages        = {3839--3845},
  title        = {Role of sulfur during acetate oxidation in biological anodes},
  url          = {http://dx.doi.org/10.1021/es803682k},
  volume       = {43},
  year         = {2009},
}

Altmetric
View in Altmetric
Web of Science
Times cited: