☆ 4.6 Article

Treatment of phenanthrene and benzene using microbial fuel cells operated continuously for possible in situ and ex situ applications

INTERNATIONAL BIODETERIORATION & BIODEGRADATION (2017)

Journal

INTERNATIONAL BIODETERIORATION & BIODEGRADATION

Volume 116, Issue -, Pages 91-103

Publisher

ELSEVIER SCI LTD

DOI: 10.1016/j.ibiod.2016.10.021

Keywords

Groundwater; Degradation efficiency; Microbial fuel cells; Petroleum hydrocarbons; Copiotrophic

Categories

Biotechnology & Applied Microbiology Environmental Sciences

Funding

Petroleum Technology Development Fund (PTDF), Nigeria

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Abstract

Bioelectrochemical systems could have potential for bioremediation of contaminants either in situ or ex situ. The treatment of a mixture of phenanthrene and benzene using two different tubular microbial fuel cells (MFCs) designed for either in situ and ex situ applications in aqueous systems was investigated over long operational periods (up to 155 days). For in situ deployments, simultaneous removal of the petroleum hydrocarbons (>90% in term of degradation efficiency) and bromate, used as catholyte, (up to 79%) with concomitant biogenic electricity generation (peak power density up to 6.75 mWm(-2)) were obtained at a hydraulic retention time (HRT) of 10 days. The tubular MFC could be operated successfully at copiotrophic (100 ppm phenanthrene, 2000 ppm benzene at HRT 30 days) and oligotrophic (phenanthrene and benzene, 50 ppb each, HRT 10 days) substrate conditions suggesting its effectiveness and robustness at extreme substrate concentrations in anoxic environments. In the MFC designed for ex situ deployments, optimum MFC performance was obtained at HRT of 30 h giving COD removal and maximum power output of approximately 77% and 6.75 mWm(-2) respectively. The MFC exhibited the ability to resist organic shock loadings and could maintain stable MFC performance. Results of this study suggest the potential use of MFC technology for possible in situ/ ex situ hydrocarbon-contaminated groundwater treatment or refinery effluents clean-up, even at extreme contaminant level conditions. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.

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