Comparative Anaerobic Decolorization of Azo Dyes by Carbon-Based Membrane Bioreactor

This study used a novel integrated technology of ceramic supported carbon membrane (CSCM) to degrade azo dyes through an anaerobic mixed culture. The CSCM worked simultaneously as biofilm support, redox mediator, and nano-filter enhance the dye decolorization efficiency. Acid Orange 7 (AO7) was initially investigated with without microorganisms in both support (CS) reactors. bioreactor (B-CSCM), operated microorganisms, gave maximum 98% using evolved from 10% weight (wt.) Matrimid 5218 solution. To know influence permeate flow, feed concentration, structure on process, different B-CSCMs for removal experiments were studied over monoazo AO7, diazo Reactive Black 5 (RB5), triazo Direct Blue 71 (DB71). highest color removal, 50 mg·L−1 solution 0.05 L·m−2·h−1 flux, 98%, 82%, 72%, respectively, RB5, DB71. By increasing these parameters 100 0.1 L·m−2·h−1, rate still achieved 37% 30% 26% In addition, system run weeks apparent loss activity. These findings make evident that combined phenomena taking place result efficient, cost-effective, ecofriendly method.