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Research Journal of Microbiology
Year: 2015  |  Volume: 10  |  Issue: 11  |  Page No.: 502 - 512

Statistical Design for Optimization of Process Parameters for Biodecolorization of Reactive Orange 4 Azo Dye by Bacillus cereus Isolate

Satyendra Kumar Garg, M. Tripathi and N. Lal    

Abstract: In the present study, different approaches are being compared for the decolorization of reactive orange 4 monoazo dye by Bacillus cereus isolate under varied cultural and nutritional conditions. By employing conventional one-factor-at-a-time approach, the bacterial strain exhibited decolorization activity over a wide range of pH (7.0-9.0), temperature (30-38°C), dye concentration (50-200 mg L–1 MSM) and inoculum size (1.0-6.0%, v/v), with peak activity (68.2% color removal) at pH 8.0, 35°C, 50 mg dye L–1 MSM and 4.0% (v/v) inoculum in the presence of 1.0% (w/v) glucose as carbon/energy source and 0.2% (w/v) ammonium nitrate within 72 h incubation. Under response surface methodology (RSM using Box-Behnken design) approach, the dye decolorization enhanced to 100% at optimized 40 mg reactive orange L–1 MSM, glucose 1.0% (w/v) and ammonium nitrate 0.2% (w/v) during 72 h of incubation. The dye decolorization time was advanced by 12 h in bioreactor trial and 100% color removal was achieved within only 60 h incubation. In future experimentation, we envisage to test the potential of our isolate for the decolorization of other variety of azo dyes, mixture of dyes as well as the real textile effluent.

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