Decolorization and Biodegradation of Textile Azo dye Disperse Red 78 By Providencia rettgeri strain HSL1

Harshad Lade, Diby Paul, Avinash Kadam, Sanjay Govindwar

Abstract


Removal of dyes from textile effluent with microorganisms, especially bacteria has recently gained attention. The present study was carried out to investigate the potential of a textile dye contaminated soil isolate Providencia rettgeri strain HSL1 for decolorization of model azo dye Disperse red 78. The bacterial strain has shown remarkably higher level of decolorization potential (98%) for selected dye Disperse red 78 (50 mg L-1) within 36 h at 30 oC and pH 7.0. Reduction in the levels of BOD, COD and TOC from decolorized broth suggests the mineralization of dye. Induced activities of azo reductase and NADH-DCIP reductase were detected in cultures grown in the presence of dye. Germination (%) and growth efficiency of Sorghum vulgare and Phaseolus mungo seeds revealed the degradation of Disperse red 78 into less toxic products than control dye. Hence, P. rettgeri strain HSL1 can be applied for the treatment of textile dye contaminated sites.


Keywords


Disperse red 78, P. rettgeri strain HSL1, Decolorization, Biodegradation, Azo reductase, Detoxification.

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