The effects of bacterial leaching on metal partitioning in sewage sludge

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 bacte...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2006-10, Vol.22 (10), p.1013-1019
Main Authors: LOMBARDI, Ana T, GARCIA, Oswaldo, MENEZES, Waldenir A. N
Format: Article
Language:English
Subjects:
Acidithiobacillus ferrooxidans
Acidithiobacillus thiooxidans
Bacteria
Biological and medical sciences
Biotechnology
Energy sources
Fundamental and applied biological sciences. Psychology
Ions
Leaching
Metals
Microbiology
Municipal wastes
Municipal wastewater
Oxidation-reduction potential
Sewage disposal
Sewage sludge
Sulfides
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Summary: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, Fe^sup 2+^for A. ferrooxidans and S^sup 0^ 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 five-step 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.[PUBLICATION ABSTRACT]
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-005-2889-1