Bioelectrochemical degradation of pollutants in wastewater using a dual-chamber microbial fuel cell with graphene-modified electrodes and electroactive bacteria
Mkilima T. Zharkenov Y. Abduova A. Kudaibergenov N. Fazylov K. Toleubayeva S. Kirgizbayeva K. Zhumadilov I. Jaxymbetova M. Zhapparova A.
June 2025Elsevier Ltd
Case Studies in Chemical and Environmental Engineering
2025#11
The increasing discharge of pharmaceuticals and nitrates into aquatic environments poses significant ecological and public health risks, as conventional wastewater treatment plants often fail to achieve complete removal. Microbial fuel cells (MFCs) offer a bioelectrochemical approach for simultaneous wastewater treatment and energy generation; however, their efficiency is constrained by slow electron transfer. This study investigated the bioelectrochemical degradation of pharmaceuticals and nitrates in wastewater using a dual-chamber MFC equipped with graphene-coated carbon cloth anodes to enhance microbial electron transfer. Wastewater samples were collected from a municipal treatment plant and a pharmaceutical discharge site, while electroactive bacteria enriched from anaerobic sludge served as biocatalysts. Pollutant degradation was analyzed using high-performance liquid chromatography (HPLC) and ion chromatography (IC), and electrochemical performance was assessed through open-circuit voltage (OCV), power density, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results demonstrated that graphene-coated anodes enhanced pharmaceutical degradation from 62.3 % to 87.6 % and nitrate removal from 58.4 % to 83.2 % over 72 hours. Power density increased by 93.6 % (from 405.6 mW/m2 to 785.3 mW/m2), while internal resistance decreased by 37.5 %, indicating improved electron transfer. Biofilm analysis revealed a 55.9 % increase in thickness and a 48.3 % higher microbial cell density on graphene-coated anodes, with metagenomic sequencing confirming the dominance of Geobacter and Shewanella. These findings highlight the potential of graphene-modified MFCs as a sustainable and scalable technology for real wastewater treatment.
Biofilm formation , Bioremediation , Electrochemical performance , Electron transfer , Wastewater treatment
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Department of Environmental Engineering and Management, The University of Dodoma, 1 Benjamin Mkapa Road, Iyumbu, Dodoma, 41218, Tanzania
Department of Civil Engineering, L.N. Gumilyov Eurasian National University, Satpayev Street 2, Astana, 010000, Kazakhstan
Department of Ecology, M. Auezov South Kazakhstan Research University, Shymkent, 160012, Kazakhstan
University of Illinois Urbana-Champaign, 910 S. Fifth St., Suite 232, Champaign, 61820, IL, United States
Department of Standardization, Certification and Metrology, L.N. Gumilyov Eurasian National University, Satpayev Street 2, Astana, 010000, Kazakhstan
Department of Geodesy and Civil Engineering, Shakarim University, Semey, 071412, Kazakhstan
Department of Soil Science, Agrochemistry and Ecology, Kazakh National Agrarian Research University, Almaty, 050000, Kazakhstan
Department of Environmental Engineering and Management
Department of Civil Engineering
Department of Ecology
University of Illinois Urbana-Champaign
Department of Standardization
Department of Geodesy and Civil Engineering
Department of Soil Science
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