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

Water Research
Iwona GajdaIoannis Ieropoulos

Abstract

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 dem...Continue Reading

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Apr 10, 2015·Bioelectrochemistry·Iwona GajdaIoannis Ieropoulos

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Citations

May 1, 2016·Bioresource Technology·Jonathan WinfieldIoannis Ieropoulos
Aug 20, 2019·Journal of Chemical Technology and Biotechnology·Iwona GajdaIoannis A Ieropoulos
Apr 24, 2020·ChemElectroChem·Carlo SantoroIoannis Ieropoulos
Dec 10, 2020·The Science of the Total Environment·Williamson GustaveZheng Chen
Oct 1, 2018·Frontiers in Energy Research·Iwona GajdaIoannis A Ieropoulos

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