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Sequential anode-cathode configuration improves cathodic oxygen reduction and effluent quality of microbial fuel cells.
Water Res. 2008 Mar; 42(6-7):1387-96.WR

Abstract

The reduction of oxygen at the cathode and the diffusion of protons from the anode to the cathode are currently perceived as two major bottlenecks of microbial fuel cells (MFCs). To address these issues, we have designed an MFC configuration in which the effluent of an acetate-fed anode was used as a feed for an aerated, biocatalysed cathode. The development of a cathodic biofilm achieved a four-fold increase of the current output compared with the non-catalysed graphite cathode, while the pH variation in the cathode compartment was reduced due to the additional transfer of protons via the liquid stream. The sequential anode-cathode configuration also provided for chemical oxygen demand (COD) polishing at the cathode by heterotrophic bacteria, with overall acetate removal consistently greater than 99%. The anode achieved an organic substrate removal of up to 2.45kg COD/m(3) of anode liquid volume per day, at Coulombic efficiencies of 65-95%. Electron balances at the cathode revealed that the main cathodic process was oxygen reduction to water with no significant Coulombic losses. The maximal power output during polarization was 110W/m(3) cathode liquid volume. The process could be operated in a stable way during more than 9 months of continuous operation. Excessive organic loading to the cathode should be avoided as it can reduce the long-term performance through the growth of heterotrophic bacteria.

Authors+Show Affiliations

Advanced Water Management Centre, The University of Queensland, St. Lucia, QLD 4072, Australia. stefano@awmc.uq.edu.auNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17996270

Citation

Freguia, Stefano, et al. "Sequential Anode-cathode Configuration Improves Cathodic Oxygen Reduction and Effluent Quality of Microbial Fuel Cells." Water Research, vol. 42, no. 6-7, 2008, pp. 1387-96.
Freguia S, Rabaey K, Yuan Z, et al. Sequential anode-cathode configuration improves cathodic oxygen reduction and effluent quality of microbial fuel cells. Water Res. 2008;42(6-7):1387-96.
Freguia, S., Rabaey, K., Yuan, Z., & Keller, J. (2008). Sequential anode-cathode configuration improves cathodic oxygen reduction and effluent quality of microbial fuel cells. Water Research, 42(6-7), 1387-96.
Freguia S, et al. Sequential Anode-cathode Configuration Improves Cathodic Oxygen Reduction and Effluent Quality of Microbial Fuel Cells. Water Res. 2008;42(6-7):1387-96. PubMed PMID: 17996270.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sequential anode-cathode configuration improves cathodic oxygen reduction and effluent quality of microbial fuel cells. AU - Freguia,Stefano, AU - Rabaey,Korneel, AU - Yuan,Zhiguo, AU - Keller,Jürg, Y1 - 2007/10/11/ PY - 2007/06/25/received PY - 2007/10/03/revised PY - 2007/10/06/accepted PY - 2007/11/13/pubmed PY - 2008/8/1/medline PY - 2007/11/13/entrez SP - 1387 EP - 96 JF - Water research JO - Water Res. VL - 42 IS - 6-7 N2 - The reduction of oxygen at the cathode and the diffusion of protons from the anode to the cathode are currently perceived as two major bottlenecks of microbial fuel cells (MFCs). To address these issues, we have designed an MFC configuration in which the effluent of an acetate-fed anode was used as a feed for an aerated, biocatalysed cathode. The development of a cathodic biofilm achieved a four-fold increase of the current output compared with the non-catalysed graphite cathode, while the pH variation in the cathode compartment was reduced due to the additional transfer of protons via the liquid stream. The sequential anode-cathode configuration also provided for chemical oxygen demand (COD) polishing at the cathode by heterotrophic bacteria, with overall acetate removal consistently greater than 99%. The anode achieved an organic substrate removal of up to 2.45kg COD/m(3) of anode liquid volume per day, at Coulombic efficiencies of 65-95%. Electron balances at the cathode revealed that the main cathodic process was oxygen reduction to water with no significant Coulombic losses. The maximal power output during polarization was 110W/m(3) cathode liquid volume. The process could be operated in a stable way during more than 9 months of continuous operation. Excessive organic loading to the cathode should be avoided as it can reduce the long-term performance through the growth of heterotrophic bacteria. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/17996270/Sequential_anode_cathode_configuration_improves_cathodic_oxygen_reduction_and_effluent_quality_of_microbial_fuel_cells_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(07)00641-0 DB - PRIME DP - Unbound Medicine ER -