Mercury bioremediation by mercury accumulating Enterobacter sp. cells and its alginate immobilized application |
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Authors: | Arvind Sinha Sunil Kumar Khare |
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Institution: | (1) Enzyme and Microbial Biochemistry Laboratory, Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India; |
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Abstract: | The effective microbial remediation of the mercury necessitates the mercury to be trapped within the cells without being recycled
back to the environment. The study describes a mercury bioaccumulating strain of Enterobacter sp., which remediated mercury from the medium simultaneous to its growth. The transmission electron micrographs and electron
dispersive X-ray analysis revealed the accumulation of remediated mercury as nano-size particles in the cytoplasm as well
as on the cell wall. The Enterobacter sp. in the present work was able to accumulate mercury, without being engineered in its native form. The possibility of recovering
the accumulated mercury from the cells is also indicated. The applicability of the alginate immobilized cells in removing
mercury from synthetic and complex industrial effluent in a batch mode was amply demonstrated. The initial load of 7.3 mg l−1 mercury in the industrial effluent was completely removed in 72 h. The cells immobilized in calcium alginate were similarly
effective in the complete removal of 5 mg l−1 HgCl2 of mercury from the synthetic effluent in less than 72 h. The immobilized cells could be reused for multiple cycles. |
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