Electrode Microbial Communities Associated with Electron Donor Source Types in a Bioelectrochemical System Treating Azo-Dye Wastewater

Bioelectrochemical systems (BESs) have been acknowledged to be an efficient technology for refractory pollution treatment. An electron donor is as indispensable element of BES, and domestic wastewater (DW) has proved a cost-efficient accessible alternative option expensive carbon sources (such acetate glucose), yet its effect on microbial community evolution not thoroughly revealed. In this study, the electrode communities from BESs treating azo dye fed by DW (RDW), (RAc), glucose (RGlu) were systematically revealed based 16S rRNA Illumina MiSeq sequencing platform. It was found that there significant differences between three groups in structures. Desulfovibrio, Acinetobacter, Klebsiella identified predominant bacterial genera RDW, RAc, RGlu, respectively. Methanosaeta, most enriched methanogen all reactors, had relative lower abundance RDW. Microbial RAc RGlu sensitive polarity while RDW position. Compared with pure substrates, increased diversity and, thus, may enhance stability biofilm. This study provides insight into response mechanism donors engineering implications development BES.