Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 75, Issue -, Pages 187-193Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2012.10.004
Keywords
Bacterial consortium; Enterobacter dissolvensAGYP1; Pseudomonas aeruginosaAGYP2; Decolorization; Phytotoxicity
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The present study deals with the decolorization of di-azo dye Acid Maroon V by consortium EDPA comprised of two isolates obtained from a contaminated site. The two isolates Enterobacter dissolvensAGYP1 and Pseudomonas aeruginosaAGYP2 were identified based on 16S rDNA sequencing. 93% decolorization of dye (100 mg l(-1)) was observed in Mineral Salt Medium in 20 h under static incubation condition. The consortium retained a decolorization activity over a wide range of pH values (6.0-9.0) with peak activity at pH 7.0. Additionally, consortium decolorized relatively high concentrations of Acid Maroon V (100-2000 mg l(-1)). The addition of sucrose co-substrate plus ammonium dihydrogen phosphate increased decolorization rate. The degradation of the dye was confirmed using spectrophotometric analysis, HPTLC and FTIR. The consortium was also able to reduce COD by 31% within 20 h. Acid Maroon V metabolites produced by consortium EDPA were considerably less phytotoxic than the parent compound. The consortium had the ability to decolorize 16 other textile dyes. These results suggest that the consortium EDPA is suitable for biological processing of dye containing wastewaters. (c) 2012 Elsevier Ltd. All rights reserved.
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