Microbial fuel cell-driven caustic potash production from wastewater for carbon sequestration

Gajda, I., Greenman, J., Melhuish, C., Santoro, C. and Ieropoulos, I. (2016) Microbial fuel cell-driven caustic potash production from wastewater for carbon sequestration. Bioresource Technology, 215. pp. 285-289. ISSN 0960-8524 Available from: http://eprints.uwe.ac.uk/28589

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Publisher's URL: http://dx.doi.org/10.1016/j.biortech.2016.04.004


This work reports on the novel formation of caustic potash (KOH) directly on the MFC cathode locking carbon dioxide into potassium bicarbonate salt (kalicinite) while producing, instead of consuming electrical power. Using potassium-rich wastewater as a fuel for microorganisms to generate electricity in the anode chamber, has resulted in the formation of caustic catholyte directly on the surface of the cathode electrode. Analysis of this liquid has shown to be highly alkaline (pH>13) and act as a CO2 sorbent. It has been later mineralized to kalicinite thus locking carbon dioxide into potassium bicarbonate salt. This work demonstrates an electricity generation method as a simple, cost-effective and environmentally friendly route towards CO2 sequestration that perhaps leads to carbon negative economy. Moreover, it shows a potential application for both electricity production and nutrient recovery in a mineral form from nutrient-rich wastewater stream such as urine for use as fertilizer in the future.

Item Type:Article
Uncontrolled Keywords:microbial fuel cell, caustic potash, kalicinite, carbon capture, wet scrubbing
Faculty/Department:Faculty of Environment and Technology > Department of Engineering Design and Mathematics
ID Code:28589
Deposited By: Dr I. Gajda
Deposited On:04 Apr 2016 10:43
Last Modified:04 May 2018 14:37

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