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Influences of dissolved oxygen concentration on biocathodic microbial communities in microbial fuel cells

Rago, Laura, Cristiani, Pierangela, Villa, Federica, Zecchin, Sarah, Colombo, Alessandra, Cavalca, Lucia, Schievano, Andrea·2017·Bioelectrochemistry
DOI 10.1016/j.bioelechem.2017.04.001
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Abstract

Dissolved oxygen (DO) at cathodic interface is a critical factor influencing microbial fuel cells (MFC) performance. In this work, three MFCs were operated with cathode under different DO conditions: i) air-breathing (A-MFC); ii) water-submerged (W-MFC) and iii) assisted by photosynthetic microorganisms (P-MFC). A plateau of maximum current was reached at 1.06±0.03mA, 1.48±0.06mA and 1.66±0.04mA, increasing respectively for W-MFC, P-MFC and A-MFC. Electrochemical and microbiological tools (Illumina sequencing, confocal microscopy and biofilm cryosectioning) were used to explore anodic and cathodic biofilm in each MFC type. In all cases, biocathodes improved oxygen reduction reaction (ORR) as compared to abiotic condition and A-MFC was the best performing system. Photosynthetic cultures in the cathodic chamber supplied high DO level, up to 16mg O2 L -1 , which sustained aerobic microbial community in P-MFC biocathode. Halomonas, Pseudomonas and other microaerophilic genera reached >50% of the total OTUs. The presence of sulfur reducing bacteria (Desulfuromonas) and purple non-sulfur bacteria in A-MFC biocathode suggested that the recirculation of sulfur compounds could shuttle electrons to sustain the reduction of oxygen as final electron acceptor. The low DO concentration limited the cathode in W-MFC. A model of two different possible microbial mechanisms is proposed which can drive predominantly cathodic ORR.

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Metadata

Authors
Rago, L., Cristiani, P., Villa, F., Zecchin, S., Colombo, A., Cavalca, L., & Schievano, A.
Venue
Bioelectrochemistry
Publisher
Elsevier BV
Published
2017-08
Volume
116
Pages
39-51
ISSN
1567-5394
DOI
10.1016/j.bioelechem.2017.04.001
Cited by
128
References
1
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Funders
  • MIUR (RBSI14JKU3)
  • Research Fund for the Italian Electrical System

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