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Eco-electrogenic treatment of dyestuff wastewater using constructed wetland-microbial fuel cell system with an evaluation of electrode-enriched microbial community structures

Rathour, Rohit, Patel, Dishant, Shaikh, Shabnam, Desai, Chirayu
Bioresource technology 2019 v.285 pp. 121349
Fimbristylis, Oreochromis niloticus, anodes, biofilm, biomarkers, bioremediation, cathodes, chemical oxygen demand, community structure, dyes, electrochemistry, fuel cells, gene expression regulation, genes, microbial communities, oxidative stress, quantitative polymerase chain reaction, reverse transcriptase polymerase chain reaction, stress response, wastewater, wetlands
This work studied eco-electrogenic treatment of real dyestuff wastewater along with characterization of electrode-enriched microbial community structures in Fimbristylis dichotoma planted closed-circuit constructed wetland-microbial fuel cell (CW-MFC) system. The CW-MFC-2 (experimental system) achieved 82.2 ± 1.7% ADMI removal and 70 ± 2% COD reduction; that were found to be 9% and 7.4% higher than the standalone constructed wetland (CW) system (bioremediation control) respectively. Likewise, the CW-MFC-2 system achieved maximum power density of 198.8 mW/m2, which was 85.6 ± 2.47% higher than the CW-MFC-1 system (eco-electricity control). Quantitative reverse transcription PCR (qRT-PCR) assays revealed significant down-regulation of hepatic oxidative stress response biomarker genes in Oreochromis niloticus exposed to CW-MFC-2 system treated dyestuff wastewater as compared with untreated wastewater. The biofilms associated with the anode and cathode of the CW-MFC-2 system exhibited selective enrichment of electrochemically active and dye degrading microbial communities.