Effect of microbial fuel cell operation time on the disinfection efficacy of electrochemically synthesised catholyte from urine

Merino-Jimenez, I.; Obata, O.; Pasternak, G.; Gajda, I.; Greenman, J.; Ieropoulos, I.

Abstract

Microbial fuel cells (MFCs) offer an excellent solution to tackle some of the major challenges currently faced by humankind: sustainable energy sources, waste management and water stress. Besides treating wastewater and producing useful electricity from urine, ceramic MFCs can also generate biocidal catholyte in-situ. It has been proved that the electricity generation from the MFCs has a high impact in the catholyte composition. Therefore, the catholyte composition constantly changes while electricity is generated. However, these changes in catholyte composition with time has not yet been studied and that could highly contribute to the disinfection efficacy. In this work, the evolution of the catholyte generation and composition with the MFC operation time has been chemically and microbiologically evaluated, during 42 days. The results show an increase in pH and conductivity with the operation time, reaching pH 11.5. Flow cytometry and luminometer analyses of bioluminescent pathogenic E. coli exposed to the synthesised catholyte revealed killing properties against bacterial cells. A bio-electrochemical system, capable of electricity generation and simultaneous production of bactericidal catholyte from human urine is presented. The possibility to electrochemically generate in-situ a bacterial killing agent from urine, offers a great opportunity for water reuse and resource recovery for practical implementations.

• Journal Article Type: Article
• Acceptance Date: Oct 21, 2020
• Online Publication Date: Oct 25, 2020
• Publication Date: Feb 1, 2021
• Deposit Date: May 6, 2021
• Publicly Available Date: May 6, 2021
• Journal: Process Biochemistry
• Print ISSN: 1359-5113
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 101
• Pages: 294-303
• DOI: https://doi.org/10.1016/j.procbio.2020.10.014
• Keywords: Applied Microbiology and Biotechnology; Biochemistry; Bioengineering
• Public URL: https://uwe-repository.worktribe.com/output/7338165
• Additional Information: This article is maintained by: Elsevier; Article Title: Effect of microbial fuel cell operation time on the disinfection efficacy of electrochemically synthesised catholyte from urine; Journal Title: Process Biochemistry; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.procbio.2020.10.014; Content Type: article; Copyright: © 2020 The Authors. Published by Elsevier Ltd.