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Temperature, inocula and substrate: Contrasting electroactive consortia, diversity and performance in microbial fuel cells

Lookup NU author(s): Dr Elizabeth Heidrich, Dr Jan Dolfing, Dr Matthew Wade, Professor William Sloan, Professor Thomas Curtis

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

The factors that affect microbial community assembly and its effects on the performance of bioelectrochemical systems are poorly understood. Sixteen microbial fuel cell (MFC) reactors were set up to test the importance of inoculum, temperature and substrate: Arctic soil versus wastewater as inoculum; warm (26.5 °C) versus cold (7.5 °C) temperature; and acetate versus wastewater as substrate. Substrate was the dominant factor in determining performance and diversity: unexpectedly the simple electrogenic substrate delivered a higher diversity than a complex wastewater. Furthermore, in acetate fed reactors, diversity did not correlate with performance, yet in wastewater fed ones it did, with greater diversity sustaining higher power densities and coulombic efficiencies. Temperature had only a minor effect on power density, (Q10: 2 and 1.2 for acetate and wastewater respectively): this is surprising given the well-known temperature sensitivity of anaerobic bioreactors. Reactors were able to operate at low temperature with real wastewater without the need for specialised inocula; it is speculated that MFC biofilms may have a self-heating effect. Importantly, the warm acetate fed reactors in this study did not act as direct model for cold wastewater fed systems. Application of this technology will encompass use of real wastewater at ambient temperatures.


Publication metadata

Author(s): Heidrich ES, Dolfing J, Wade MJ, Sloan WT, Quince C, Curtis TP

Publication type: Article

Publication status: Published

Journal: Bioelectrochemistry

Year: 2018

Volume: 119

Pages: 43-50

Print publication date: 01/02/2018

Online publication date: 22/07/2017

Acceptance date: 14/07/2017

ISSN (print): 1567-5394

ISSN (electronic): 1878-562X

Publisher: Elsevier

URL: http://doi.org/10.1016/j.bioelechem.2017.07.006

DOI: 10.1016/j.bioelechem.2017.07.006


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