ABSTRACT
India is the one of the world’s largest producers of textiles and garments. Textile processes requires large volume of fresh water in various cloth processing operations. The inputs of wide range of chemicals/dyes, which, if not incorporated in the final products (fabric), become waste and turn out to be part of water ecosystem. This experiment was designed to optimize the various parameters for dye removal and to study the removal of dye from treated and untreated textile industry effluent by isolated bacterial strains in optimized conditions. Observations revealed that the rate of dye decolourization efficiency by bacterial strains was significantly influenced by initial dye concentration, pH, temperature of incubation and incubation time. About 60-70% colour removal from the samples was achieved after the incubation period of four days, and a little change in decolourization rate was observed thereafter. It was also observed in the study that optimal conditions for CR dye removal by using strain 1 were found to be pH of 6 (70.4%), incubation temperature, 35°C (76.5%) and by using strain 2 it was found to be pH of 6 (77%), incubation temperature of 30°C (77.1 %) at a constant string speed of 150 rpm with 25 ppm dye concentration. While in case of PR dye optimal conditions were pH 6 (69-74%) and incubation temperature of 30°C. Dye degrading capacity of both the strains was evaluated and it was found that strain 2 namely Lysinibacillus fusiformis isolated from untreated effluent was found to be highly effective for the removal of both the dye from solution as compare to strain 1.
