Bioremediation of cadmium by growing Rhodobacter sphaeroides: kinetic characteristic and mechanism studies |
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Authors: | Bai Hong-Juan Zhang Zhao-Ming Yang Guan-E Li Bao-Zhen |
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Institution: | School of Chemical Engineering and Environment, North University of China, Taiyuan 030051, PR China. bhj44871@163.com |
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Abstract: | The removal kinetic characteristic and mechanism of cadmium by growing Rhodobacter sphaeroides were investigated. The removal data were fitted to the second-order equation, with a correlation coefficient, R2=0.9790-0.9916. Furthermore, it was found that the removal mechanism of cadmium was predominantly governed by bioprecipitation as cadmium sulfide with biosorption contributing to a minor extent. Also, the results revealed that the activities of cysteine desulfhydrase in strains grown in the presence of 10 and 20 mg/l of cadmium were higher than in the control, while the activities in the presence of 30 and 40 mg/l of cadmium were lower than in the control. Content analysis of subcellular fractionation showed that cadmium was mostly removed and transformed by precipitation on the cell wall. |
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Keywords: | Rhodobacter sphaeroides Cadmium Kinetic characteristic Bioremediation mechanism |
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