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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Kluwer Academic Publishers

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DOI

10.1002/cber.19300630620

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1573-0972

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The Effects of Bacterial Leaching on Metal Partiti

Authors: Ana T Lombardi Oswaldo Garcia Waldenir A N Menezes
Publish Date: 2006/03/28
Volume: 22, Issue: 10, Pages: 1013-1019
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Abstract

The partitioning of Mn Al Zn Cu and Ti ions in municipal sewage sludge was investigated before and after bioleaching processes effectuated by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans Oxidation–reduction potential increase and pH decrease were obtained as a result of bacterial activity A less pronounced and constant decrease was obtained with A ferrooxidans whereas A thiooxidans presented a lag phase before a steep pH decrease Metal solubilization was accomplished in experimental systems supplemented with energy source Fe2+ for A ferrooxidans and S0 for A thiooxidans Solubilization efficiency differed for each metal except for Al and was relatively similar for either organism Metal partitioning was conducted using a fivestep sequential extraction procedure before and after the bioleaching The results indicated that Zn and Mn ions were mostly associated with the organic fraction whereas Cu Al and Ti ions with the sulphide/residue fraction The bioleaching process caused prompt solubilization of metals mostly associated with the more labile fractions exchangeable adsorbed and organically bound metals whereas those associated to the less labile ones EDTA and sulphide/residue fractions were exchanged towards more labile fractions

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