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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 1, 2008
Accepted December 8, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effect of Ni^(2+), V^(4+) and Mo^(6+) concentration on iron oxidation by Acidithiobacillus ferrooxidans

Debabrata Pradhan^{1 2} Jong-Gwan Ahn¹ Dong-Jin Kim^1† Seoung-Won Lee²

¹Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Korea ²Nano Engineering Division, School of Engineering, Chungnam National University, Daejeon 305-764, Korea

djkim@kigam.re.kr

Korean Journal of Chemical Engineering, May 2009, 26(3), 736-741(6), 10.1007/s11814-009-0123-9

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Abstract

The ferrous oxidation ability of Acidithiobacillus ferrooxidans was studied in the presence of Ni^(2+), V^(4+) and Mo^(6+) in 9 K media in order to implement the culture in the bioleaching of spent catalyst. The rate of iron oxidation decreased with increasing concentration of metal ions, but the rate of inhibition was metal-ion dependent. The tolerance limit was critical at a concentration of 25 g/L Ni^(2+), 5 g/L V^(4+) and 0.03 g/L Mo^(6+). The growth rate of microorganisms was negligible at concentrations of 6 g/L V^(4+) and 0.04 g/L Mo^(6+). Levels and degree of toxicity of these ions have been quantified in terms of a toxicity index (TI). The toxicity order of metal ions was found to be Mo^(6+)>V^(4+)>Ni^(2+). The significance and relevance of multi-metal ion tolerance in Acidithiobacillus ferrooxidans has been highlighted with respect to bioleaching of spent refinery catalyst.

Keywords

Iron Oxidation Rate Acidithiobacillus ferrooxidans Adaptation Tolerance Toxicity Index Bioleaching

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