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Effect of solids concentration on bacterial leaching of heavy metals from sewage sludge

Title
Effect of solids concentration on bacterial leaching of heavy metals from sewage sludge
Authors
Cho K.-S.Ryu H.W.Lee I.S.Choi H.-M.
Ewha Authors
이인숙조경숙
SCOPUS Author ID
이인숙scopusscopus; 조경숙scopus
Issue Date
2002
Journal Title
Journal of the Air and Waste Management Association
ISSN
1047-3289JCR Link
Citation
vol. 52, no. 2, pp. 237 - 243
Indexed
SCOPUS WOS scopus
Abstract
Microbial metal leaching from sewage sludge (2-9% w/v) was carried out with the iron-oxidizing bacterium Thiobacillus ferrooxidans. Measurements of pH, oxidation-reduction potential, and concentration of Fe2+ indicated that T. ferrooxidans was effective in removing metals from an incubation bath containing less than 5% sludge solids concentration. Specifically, Cu leaching was completely suppressed at a high solids concentration of 9% (w/v). Results indicated that the deactivation of T. ferrooxidans at a high sludge content was mainly due to the presence of inhibiting materials such as organic matter. A mixed culture of sulfur-oxidizing bacteria was obtained by enrichment from anaerobically digested sewage sludge to enhance the efficiency of the microbial leaching process. These bacteria were much more effective in metal leaching than was iron-oxidizing T. ferrooxidans. At 9% (w/v) solids concentration, the leaching efficiencies of Zn and Cu were 78% (2.66 g/kg dry sludge) and 59% (1.36 g/kg dry sludge), respectively. Therefore, when removing heavy metals from the anaerobically digested sewage sludge, the indigenous sulfur-oxidizing bacteria isolated in the current study were more efficient than T. ferrooxidans, especially at high sludge solids concentrations.
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자연과학대학 > 생명과학전공 > Journal papers
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