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Int. J. Environ. Res. Public Health 2016, 13(11), 1053; doi:10.3390/ijerph13111053

The Comparative Study on the Rapid Decolorization of Azo, Anthraquinone and Triphenylmethane Dyes by Anaerobic Sludge

College of Life Science, Northeast Forestry University, Harbin 150040, China
These authors contribute equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 20 August 2016 / Revised: 19 October 2016 / Accepted: 21 October 2016 / Published: 28 October 2016
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Abstract

An anaerobic sludge (AS), capable of decolorizing a variety of synthetic dyes, was acclimated and is reported here. The sludge presented a much better dye decolorizing ability than that of different individual strains. A broad spectrum of dyes could be decolorized by the sludge. Continuous decolorization tests showed that the sludge exhibited the ability to decolorize repeated additions of dye. The chemical oxygen demand (COD) removal rate of the dye wastewater reached 52% after 12 h of incubation. Polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE) profiles revealed that the microbial community changed as a result of varying initial concentrations of dyes. Phylogenetic analysis indicated that microbial populations in the sludge belonged to the phyla Acidobacteria, Firmicutes, Bacteroidetes, Chloroflexi and Proteobacteria. The degradation products of the three types of dye were identified. For azo dyes, the anaerobic sludge converted Methyl Orange to N,N-dimethylbenzene-1,4-diamine and 4-aminobenzenesulfonic acid; for triphenylmethane dyes, after Malachite Green was decolorized, the analyzed products were found to be a mixture of N,N-dimethylbenzenamine, 3-dimethyl-aminophenol and 4-dimethylaminobenzophenone; for anthraquinone dyes, two products (acetophenone and 2-methylbenzoic acid) were observed after Reactive Blue 19 decolorization. Together, these results suggest that the anaerobic sludge has promising potential for use in the treatment of industrial wastewater containing various types of dyes. View Full-Text
Keywords: anaerobic sludge; synthetic dyes; decolorization; biodegradation; microbial community; intermediates anaerobic sludge; synthetic dyes; decolorization; biodegradation; microbial community; intermediates
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Cui, D.; Zhang, H.; He, R.; Zhao, M. The Comparative Study on the Rapid Decolorization of Azo, Anthraquinone and Triphenylmethane Dyes by Anaerobic Sludge. Int. J. Environ. Res. Public Health 2016, 13, 1053.

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