NDLI: Microbial removal of Hexavalent chromium from chromite waste dump

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Microbial removal of Hexavalent chromium from chromite waste dump

Content Provider	Semantic Scholar
Author	Rathore, Sudarshan Singh Tiwary, Rajani Kant Birendra, Kumar Padma, P.
Copyright Year	2014
Abstract	Sukinda Chromite Valley, of Orissa, contains 95% of India’s Chromite ore. The Over Burden (OB) material contain approx. 30-40 thousand ppm of Cr (VI) which, after leaching, enters into the ground water regime and contaminate ground water with respect to Cr (VI). Therefore OB dump is the major source of Cr (VI) which by may be removed by microbial reduction which is most effective and economical. Our objective involves isolating and enriching Cr (VI) reducing microbes for the biological treatment of Cr (VI) from Chromite waste dump and evolving optimal strategy for cost-effective remediation of large scale Cr (VI) contaminated OB dump sites. 25 types of bacterial cultures have been isolated from the Chromite OB waste dump soil. Among them, seven bacterial strains were capable to tolerate 100 mg/l and 50 mg/l of Cr (III) and Cr (VI) respectively are considered as chromium resistant. Nutrient agar is capable of reducing Cr (VI) to Cr (III). At about 50 mg/l initial Cr (VI) concentration, 99% reduction has been achieved by nutrient agar within 12 hours of incubation without any bacterial culture. Due to this reason peptone agar was used to check chromium (VI) resistant capability of strains. The effects of different operating parameters such as pH (9-4 pH), temperature (15, 30 and 45°C) and Cr (VI) concentrations on bio-reduction of Cr (VI) by enriched cultures were also studied in a batch system. All these experiments have been performed on artificial soil (10 ppm Cr (VI), Chromite OB waste dump soil and aqua-phase (standard chromium (VI) solution All these experiments have been performed on artificial soil (10 ppm Cr (VI), Chromite OB waste dump soil and aqua-phase (standard chromium (VI) solution).
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.malayabiosciences.com/articles/9._Sudharshan_et_al_MJB_2014_109-116.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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