Bioelectrochemical hybrid system integrating anodic biofilm and cathodic Fenton into a microbial fuel cell for multifunctional treatment of azo dye wastewater.
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75% confidenceThis study presents a hybrid bioelectrochemical system integrating anodic biofilm and cathodic bio-electro-Fenton for treating azo dye wastewater, achieving high removals of color, COD, and reduced phytotoxicity. The system operates under optimal conditions with a power density of 73.3 mW m⁻² and in situ H2O2 generation of 12.3 mg L⁻¹. The results demonstrate a sustainable strategy for advanced wastewater treatment of azo dyes.
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Abstract
This study investigates a hybrid bioelectrochemical system that integrates an anodic biofilm (ABF) with a cathodic bio-electro-Fenton (BEF) process for the treatment of azo-dye-containing wastewater. Three operational strategies were evaluated by varying the RBV-5R/acetate ratio and hydraulic retention time (HRT). Under optimal conditions (20 mg L -1 RBV-5R, 0.25 g L -1 acetate, 6 h/12 h ABF/BEF), the system achieved a power density of 73.3 mW m -2 and in situ H 2 O 2 generation of 12.3 ± 0.2 mg L -1 , resulting in high removals of color (99.8%), COD (79.6%,), and a marked reduction in phytotoxicity after pH neutralization. Unlike conventional MFC-BEF configurations, this work demonstrates a redox-sequential, self-powered ABF + BEF architecture in which the anodic biofilm serves as an active pretreatment stage prior to oxidative polishing. These results highlight the potential of this integrated platform as a sustainable strategy for advanced wastewater treatment of azo dyes.