Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Botany and Microbiology

Wastewater originating from the textile industry is one of the major sources of pollution for surface and groundwater bodies in countries where textiles and other dye-products are produced. In this study, the decolorization and degradation of azo dye, Congo Red (CR), and anthraquinone, Disperse Blue 3 (DB3), by different bacterial strains isolated from contaminated sites was investigated. The most potent bacterial strains in decolorization of CR and DB3 were Bacillus cereus MAM-B11, Bacillus cereus MAM-B22, Ochrobactrum sp. MAM-C9 and Achromobacter xylosoxidans MAM-29. The maximum decolorization of CR was observed by B. cereus MAM-B22 which removed 96.92% of 25 mg/L CR and 66.73% of 400 mg/L CR after 3 days of incubation at 37{u00B0}C. The maximum decolorization of DB3 was observed by B. cereus MAM-B11 which removed 97.86% of 25 mg/L DB3 and 73.29% of 400 mg/L DB3 after 3 days of incubation at 37{u00B0}C. The maximum removal of CR was observed at pH 7 with the strain Ochrobacterum sp. MAM-C9 which was 90.21% followed by B. cereus MAM-B22 and A. xylosoxidans MAM-29 which removed 90.03% and 89.62% respectively; while the lowest removal was observed with B. cereus MAM-B11 which was 85.84%; while the maximum decolorization of DB3 was observed at pH 8.0 which was 94.94%, 93.06%, 92.20% and 89.88% by B. cereus MAM-B11, A. xylosoxidans MAM-29, Ochrobacterum sp. MAM-C9 and B. cereus MAM-B22 respectively

Issued also as CD