Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 3, Pages 562-569Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.12.033
Keywords
azo dyes; bacterial consortium; central composite design; HPTLC; phylogenetic tree
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Decolorization and degradation of polyazo dye Direct Black 22 was carried out by distillery spent wash degrading mixed bacterial consortium, DMC. Response surface methodology (RSM) involving a central composite design (CCD) in four factors was successfully employed for the study and optimization of decolorization process. The hyper activities and interactions between glucose concentration, yeast extract concentration, dye concentration and inoculum size on dye decolorization were investigated and modeled. Under optimized conditions the bacterial consortium was able to decolorize the dye almost completely (> 91%) within 12 h. Bacterial consortium was able to decolorize 10 different azo dyes. The optimum combination of the four variables predicted through RSM was confirmed through confirmatory experiments and hence this bacterial consortium holds potential for the treatment of industrial waste water. Dye degradation products obtained during the course of decolorization were analyzed by HPTLC. (c) 2007 Elsevier Ltd. All rights reserved.
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