Bacterial strains (DRS-1, DRS-2,DRS-3,DRS-4) isolated from dye contaminated sludge,decolorized an azo dye namely Direct Red-28.Of these,DRS-1 & DRS-3 were selected for further studies because of their high efficiency to decolorize the dye. Effect of Physio-chemical parameters, such as aeration/agitation, concentration of glucose, peptone and PH of the culture medium on dye decolourization by isolates DRS-1 & DRS-3 were analyzed.DRS-1 had higher dye decolorizing ability than DRS-3.Under optimal conditions, DRS-1 decolorized Direct Red-28 (100ppm) upto 94.80%.The highest decolourization ability of isolate DRS-1 can thus be exploited in the treatment of industrial effluent containing azo dyes.
Azo Dye, Congo Red, Decolourization, Direct Red-28, Industrial Effluent
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