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JSIR Vol.66(08) [August 2007] >


Title: Microbial solubilization of heavy metals from soil using indigenous sulfur oxidizing bacterium: Effects of sulfur/soil ratio
Authors: Nareshkumar, R
Nagendran, R
Parvathi, K
Keywords: Acidithiobacillus thiooxidans
Bioleaching
Heavy metals
Soil
Solubilization
Sulfur
Issue Date: Aug-2007
Publisher: CSIR
Abstract: Present study assesses efficiency of bioleaching to decontaminate heavy metal laden soil affected by tannery effluent employing sulfur oxidizing bacterium, Acidithiobacillus thiooxidans. Concentrations of predominant heavy metals were Cd, 9; Cu, 95; Cr, 11800; Pb, 85; and Zn, 238 mg/kg. Irrespective of sulfur/soil ratio (0.14, 0.21, 0.29, 0.43 and 0.57), pH dropped from near neutral to below 1 over a period of 28 days; drop in pH was rapid when the ratio was 0.57 and it took only 6 days for pH to drop from 7.12 to 0.94. Production of sulphate (22-45 g/l) increased with rise in sulfur/soil ratio. Solubilization of heavy metals was: Cd, 44-57; Cu, 60-92; Cr, 72-81; Pb, 39-56; and Zn, 55-94%.
Page(s): 680-683
ISSN: 0022-4456
Source:JSIR Vol.66(08) [August 2007]

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