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Electro-osmotic-based catholyte production by Microbial Fuel Cells for carbon capture

Gajda, Iwona; Greenman, John; Melhuish, Chris; Santoro, Carlo; Li, Baikun; Cristiani, Pierangela; Ieropoulos, Ioannis

Authors

Chris Melhuish Chris.Melhuish@uwe.ac.uk
Director of Research Institute/Professor

Baikun Li

Pierangela Cristiani



Abstract

© 2015 The Authors. In Microbial Fuel Cells (MFCs), the recovery of water can be achieved with the help of both active (electro-osmosis), and passive (osmosis) transport pathways of electrolyte through the semi-permeable selective separator. The electrical current-dependent transport, results in cations and electro-osmotically dragged water molecules reaching the cathode. The present study reports on the production of catholyte on the surface of the cathode, which was achieved as a direct result of electricity generation using MFCs fed with wastewater, and employing Pt-free carbon based cathode electrodes. The highest pH levels (>13) of produced liquid were achieved by the MFCs with the activated carbon cathodes producing the highest power (309 μW). Caustic catholyte formation is presented in the context of beneficial cathode flooding and transport mechanisms, in an attempt to understand the effects of active and passive diffusion. Active transport was dominant under closed circuit conditions and showed a linear correlation with power performance, whereas osmotic (passive) transport was governing the passive flux of liquid in open circuit conditions. Caustic catholyte was mineralised to a mixture of carbonate and bicarbonate salts (trona) thus demonstrating an active carbon capture mechanism as a result of the MFC energy-generating performance. Carbon capture would be valuable for establishing a carbon negative economy and environmental sustainability of the wastewater treatment process.

Journal Article Type Article
Publication Date Dec 1, 2015
Journal Water Research
Print ISSN 0043-1354
Electronic ISSN 1879-2448
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 86
Pages 108-115
APA6 Citation Gajda, I., Greenman, J., Melhuish, C., Santoro, C., Li, B., Cristiani, P., & Ieropoulos, I. (2015). Electro-osmotic-based catholyte production by Microbial Fuel Cells for carbon capture. Water Research, 86, 108-115. https://doi.org/10.1016/j.watres.2015.08.014
DOI https://doi.org/10.1016/j.watres.2015.08.014
Keywords Microbial Fuel Cell (MFC), carbon veil cathodes, electro-osmotic drag, oxygen reduction reaction, carbon capture
Publisher URL http://dx.doi.org/10.1016/j.watres.2015.08.014

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