Investigation of crude oil degradation using metal oxide anode-based microbial fuel cell

Oil industries generate large amount of oil wastewater worldwide and it is challenging to develop a sustainable technique to treat them due to the potential risk of contamination and recalcitrance. In this study, we employed microbial fuel cell to investigate biodegradation of crude oil with concomitant power generation. MnO₂ coated anode was used to facilitate anoxic oil degradation due to better biofilm attachment, and fuel cell performance was compared with the uncoated carbon anode. Our study revealed that MFC with coated anode produced comparatively higher power density (47 mW m⁻²) than uncoated carbon anode (38 mW m⁻²), suggesting better removal of hydrocarbon components, also confirmed by oil-biodegradation studies (36% compared to 25.5% removal of total alkanes). The performance of the two cells was additionally evaluated by electrochemical, morphological, elemental and microbial community analysis. The prevalence of communities associated with hydrocarbon degradation and electrogenesis signify crude oil degradation with power generation.