Three bacterial strains Bacillus pumilis, Cellulosimicrobium cellulans and ExtguoOactertum were investigated when grown in Luria-Bertani （LB） medium at 500 μg/mL Cr（VI）. The hexavalent chromium reduction was meas...Three bacterial strains Bacillus pumilis, Cellulosimicrobium cellulans and ExtguoOactertum were investigated when grown in Luria-Bertani （LB） medium at 500 μg/mL Cr（VI）. The hexavalent chromium reduction was measured by growing the strains in DeLeo and Ehrlich （1994） medium at 200 and 400 μg/mL K2CrO4. The optimal Cr （VI） reduction by strains B. pumilis, Exigubacterium and C. cellulans was 51%, 39%, and 41%, respectively, at an initial KzCrO4 concentration of 200 ~tg/mL at pH 3 and temperature 37℃. At an initial chromate concentration of 400 gg/mL, the Cr（VI） reduction by strains B. purnilis, Exigubacterium and C. cellulans was 24%, 19%, and 18%, respectively at pH 3 at 37℃ after 24 h. These strains have ability to reduce toxic hexavalent chromium to the less mobile trivalent chromium at a wide range of different environmental conditions and can be useful for the treatment of contaminated wastewater and soils.展开更多
文摘Three bacterial strains Bacillus pumilis, Cellulosimicrobium cellulans and ExtguoOactertum were investigated when grown in Luria-Bertani （LB） medium at 500 μg/mL Cr（VI）. The hexavalent chromium reduction was measured by growing the strains in DeLeo and Ehrlich （1994） medium at 200 and 400 μg/mL K2CrO4. The optimal Cr （VI） reduction by strains B. pumilis, Exigubacterium and C. cellulans was 51%, 39%, and 41%, respectively, at an initial KzCrO4 concentration of 200 ~tg/mL at pH 3 and temperature 37℃. At an initial chromate concentration of 400 gg/mL, the Cr（VI） reduction by strains B. purnilis, Exigubacterium and C. cellulans was 24%, 19%, and 18%, respectively at pH 3 at 37℃ after 24 h. These strains have ability to reduce toxic hexavalent chromium to the less mobile trivalent chromium at a wide range of different environmental conditions and can be useful for the treatment of contaminated wastewater and soils.
