Dr. Saranya Devi K
Isolation and screening of potential dye decolorizing bacteria from textile dye effluents in tamil nadu, india
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The present study reveals that the enriched aerobic cultures of indigenous microbes can be used successfully for decolorizing dye effluents. Physico-chemical analysis of dye effluent revealed high load of pollution indicators. Textile dye effluent and contaminated soils were collected and analyzed for selection of suitable bacteria for dye degradation. The residual bacterial load was found to be in the range of 108 cfu/mL. Six bacterial strains viz., two species of Bacillus, two species of Klebsiella,, one species each of Planococcus and Micrococcus luteus were isolated. The best two dye degraders namely species of Planococcus and Bacillus were further optimized for the effect of carbon and nitrogen source, pH, temperature and percentage of inoculum. The optimized conditions for both the isolates of Planococcus sp. and Bacillus sp. were used in bio-decolorization studies of textile effluent. More than 50% of decolorization was achieved within 4 d of incubation. After 6 d of incubation, decolorization was achieved above 80%. The isolates Planococcus sp. and Bacillus sp. exhibited maximum decolorization ability at pH between 5-8 and temperature 37C. Moreover, 10% (v/v) inoculums, glucose and peptone as carbon and nitrogen sources were found to be the optimum for decolorization. Both the isolates showed highest decolorization percentage of Coractive Blue 3R dye effectively during optimization and more interestingly showed consistent decolorization of textile dye throughout the study.
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