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Effect of direct electrical stimulation on decolorization and degradation of azo dye reactive brilliant red X-3B in biofilm-electrode reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
3081 149 2015 9 PDF Available
Title
Effect of direct electrical stimulation on decolorization and degradation of azo dye reactive brilliant red X-3B in biofilm-electrode reactors
Abstract

•Electrical stimulation on cell growth on biofilm-electrode was studied.•Effects of voltage drop on decolorization and COD removal in the BER were studied.•Higher cultivating voltage helps to economize the operating voltage of the BER.•The synergistic effect of electrode reaction and biodegradation existed in BER.•Dye degradation products and degradation mechanism by the BER were analyzed.

The degradation of azo dye Reactive Brilliant Red (RBR) X-3B in biofilm-electrode reactors (BERs) with graphite rod as anode and activated carbon fiber attached to steel as cathode was studied. The electrical stimulating effect in terms of cell growth was obtained when the cultivating voltage was between 1.0 and 2.5 V, and higher decolorization efficiencies and COD removal were also obtained in this condition. There was long-term effect of cultivating voltage on performance of BERs even if the electrical power was shut off. As the dye concentration was higher than 100 mg L−1, the decolorization efficiency and COD removal in the BER were significantly higher than the sum of the same values in a single biological reactor and a single electrochemical reactor, which indicated that there was a synergistic effect between the electrode reaction and biodegradation. Kinetic analysis of color removal of RBR X-3B indicated that the rapid adsorption by microorganisms was weak and the decolorization process with time followed first-order kinetics. GC–MS analysis of the degradation products suggested that the main reaction mechanism of RBR X-3B degradation was the reduction of N=N bonds on the biofilm cathode.

Keywords
Biofilms; Anaerobic processes; Wastewater treatment; Biodegradation; Decolorization; Electrical stimulation.
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Effect of direct electrical stimulation on decolorization and degradation of azo dye reactive brilliant red X-3B in biofilm-electrode reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 93, 15 January 2015, Pages 294–302
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us