Bioremediation of Cr(VI) from chromite mine drainage using native fungal isolates
Open-cast mining of chromite ore deposits and the overburden dumps create degradation of environment and pollutes the natural and ground water sources due to the leaching of water soluble hexavalent chromium. Native microorganisms, which are adapted to toxic metal stress condition can play a significant role in bioremediation of Cr( VI) from contaminated sites. Chromium (VI) resistant fungal species viz. A. fumigatus was isolated from the chromite mine drainage containing 2 -5 mg/L Cr(VI) and used for bio-sorption of Cr(VI). Sorption of Cr( VI) was examined with the biomass (live) of the A. fumigatus while varying different parameters. The fungus exhibited maximum sorption at pH 5. 5 and 35t with 1％ sorbent/solution (w/v) ratio. Under the optimized conditions, the fungus showed high metal sorption ( > 96％ in 120 h) from an aqueous solution of 50 mg/L Cr ( VI). The maximum bio-sorption capacity was found to be 48. 6 mg/g with dried (live) biomass in 120 h. The chromium sorption data showed good fit to the Freundlich isotherms indicating strong chemical interaction of the metal ion with the functional groups of the fungal cell wall. The FT-IR and XRD studies were performed for the attachment and binding of metal ion on the fungal surface.
chromite mine drainage hexavalent chromium A. fumigatus- bio-sorption
B. Dhal K. D. Mehta B. D. Pandey N.N.Das H. N. Thatoi
National Metallurgical Laboratory (CSIR), 831007, Jamshedpur, India Dept. of Biotechnology, College of Engineering & Technology, 751014, Bhubaneswar, India
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
1109-1114
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）