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Enhanced Decolorization of Textile Dyes by Gamma Radiation Induced Bacillus cereus Isolated from Wastewater |
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PP: 59-70 |
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Author(s) |
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M. A. M Abo-State,
M. A. M Metwally,
M. E. M EL-Sawy,
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Abstract |
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| Two bacterial (MAM-B11 and MAM-B22) were isolated from textile wastewater I and II respectively. These two isolates were identified by 16 S rRNA as Bacillus cereus MAM-B11 and Bacillus cereus MAM-B22. The two bacterial strains were exposed to different doses of gamma radiation. As gamma radiation doses increased, the viability of the B. cereus MAM-B11 and MAM-B22 decreased gradually. Dose (15.0 kGy) reduced the viability of both MAM-B11 and MAM-B22 by 3.7 log cycles. Mutants MAM-D6 and MAM-D13 resulted from exposure of the parent strain B. cereus MAM-B11 to dose 2.0 kGy for both of the two mutants were the most efficient mutants in decolorizing textile dyes (Isma Fast red, Fantacell olive, Dycrofix Red, Dycrofix Violet, Jakazol Black, Drimarene Blue and Jakofix Yellow). However, Mutants (MAM-D1, MAM-D15, MAM-D17 and MAM-D18) resulted from exposure of parent strain B. cereus MAM-B22 to doses 8.0, 8.0, 10.0 and 4.0 kGy respectively. These mutants were more efficient in decolorizing textile dyes. They decolorized Isma Fast dye more than parent strains by a range between 1.0% to 14.0%, Fantacell olive dye by a range between 1.0% to 25.0%, Dycrofix Red dye by a range between 26.0% to 88.0%, Dycrofix Violet dye by a range between 3.0% to 238.0%, Jakazol Black dye by a range between 3.0% to 9.0%, Drimarene Blue dye by a range between 7.0% to 33.0% and Jakofix Yellow dye by a range between 17.0% to 210.0%. Parent strains and their mutants decolorized textile wastewater I efficiently (more than 95.0%). |
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