Vol. 7, Issue 2 (2018)

Author(s):
Anamika Ghatak and Suchismita Das

Abstract:
The wastes generated from the industrial dyes confer serious hazard to soil and water bodies. Various physicochemical methods have been employed for their elimination; however, owing to the less efficiency and their expensive nature, interest has been generated for searching microbial agents capable of decolorizing these dyes. In this study three bacterial strains were isolated from industrial effluent contaminated Ganges water and nearby locality having high effectiveness to decolorize Malachite green (MG), a triphenylmethane dye widely used in industries. The bacterial isolates were partially characterized as gram negative, Indole and MR negative, VP and citrate positive. The optimal MG decolourization conditions were when 50 ppm (mg/lt) dye was added in medium of pH 8.0 at 37 ^oC. The strains decolorized MG in the range of 74 - 82% within just 4 hours and almost decolorized the dye (91-96%) within 30 hours of addition. The decolorization of other dyes such as congo red, nigrosine, crystal violet and safranine was further exploited in these strains. The results provide evidence that the strains are potential candidates that can be exploited for industrial waste-water treatment.