Alleviation of toxic hexavalent chromium using indigenous aerobic bacteria isolated from contaminated tannery industry sites

In the last decade, much attention has been paid to bioremediation of Cr(VI) using various bacterial species. Cr(VI) remediation by indegeneous bacteria isolated from contaminated sites of a tannery industry located in Tamil Nadu, India, was investigated in this study. Three Cr(VI) resistant bacteri...

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Bibliographic Details
Published in:Preparative biochemistry & biotechnology 2016-07, Vol.46 (5), p.517-523
Main Authors: Pandey, Siddhartha, Singh, Nitin Kumar, Bansal, Ankur Kumar, Arutchelvan, V., Sarkar, Sudipta
Format: Article
Language:English
Subjects:
Bacteria
Bacteria, Aerobic - growth & development
Bacteria, Aerobic - metabolism
Biodegradation, Environmental
Bioremediation
Chromium
Chromium - isolation & purification
Chromium - metabolism
Environmental Pollutants - isolation & purification
Environmental Pollutants - metabolism
growth behavior
hexavalent chromium
Industrial Waste
kinetic studies
Kinetics
Streptomyces
Streptomyces sp
Tanning
tolerance
Toxicology
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Summary:In the last decade, much attention has been paid to bioremediation of Cr(VI) using various bacterial species. Cr(VI) remediation by indegeneous bacteria isolated from contaminated sites of a tannery industry located in Tamil Nadu, India, was investigated in this study. Three Cr(VI) resistant bacterial strains (TES-1, TEf-1, and TES-2) were isolated and selected based on their Cr(VI) reduction ability in minimal salt medium. Among these three bacterial strains, TES-1 was found to be most efficient in bioreduction, while TES-2 was only found to be Cr(VI) resistant and showed negligible bioreduction, whereas TEf-1 was observed to be most Cr(VI) tolerant. Potential for bioremediation of TES-1 and TEf-1 was further investigated at different concentrations of Cr(VI) in the range of 50 to 350 mg L −1 . TEf-1 showed prominent synchronous growth throughout the experiment, whereas TES-1 took a longer acclimatization time. Minimum inhibitory concentrations (MIC) of Cr(VI) for TES-1 and TEf-1 were approximated as 600 mg L −1 and 750 mg L −1 , respectively. The kinetic behavior of Cr(VI) reduction by TES-1 and TEf-1 exhibited zero- and first-order removal kinetics for Cr(VI), respectively. The most efficient strain TES-1 was identified as Streptomyces sp. by gene sequencing of 16S rRNA.
ISSN:1082-6068
1532-2297
DOI:10.1080/10826068.2015.1084635