Solubilization profiles of metal ions from bioleaching of sewage sludge as a function of pH |
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Authors: | Lucienne D Villar Oswaldo Garcia Jr |
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Institution: | (1) Departamento de Bioquímica e Tecnologia Química, Instituto de Química, UNESP, 14.801-970 Araraquara SP, Brazil |
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Abstract: | Two patterns of solubilization of metal ions resulting from bioleaching of sewage sludge by sulphur-oxidizing Thiobacillus spp. were established as a function of pH. Chromium and copper ions required a pH of 2–3 to initiate their solubilization, whereas nickel and zinc ions had their solubilization initiated at pH 6–6.5. The patterns obtained were independent of the sludge solids concentrations investigated (10, 17, 25, 32.5 and 40 g l–1). |
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Keywords: | bioleaching heavy metals sewage sludge solubilization profile sulphur-oxidizing bacteria |
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