BIOLEACHING OF METALS FROM ANAEROBIC SEWAGE SLUDGE: EFFECTS OF TOTAL SOLIDS, LEACHING MICROORGANISMS, AND ENERGY SOURCE

The effects of municipal sewage sludge solids concentration, leaching microorganisms (Thiobacillus thiooxidans or Thiobacillus ferrooxidans) and the addition of energy source (S 0 or Fe(II)) on the bioleaching of metals from sewage sludge has been investigated under laboratory conditions using shake...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2001-01, Vol.36 (5), p.793-806
Main Authors: Lombardi, Ana T., Garcia, Oswaldo, Mozeto, Antonio A.
Format: Article
Language:English
Subjects:
Acidithiobacillus ferrooxidans
Acidithiobacillus thiooxidans - physiology
Bioleaching
Bioreactors
Hydrogen-Ion Concentration
Metals
Metals, Heavy - chemistry
Metals, Heavy - metabolism
Sewage - microbiology
Sewage sludge
Solubility
Thiobacillus
Water Pollution - prevention & control
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Summary:The effects of municipal sewage sludge solids concentration, leaching microorganisms (Thiobacillus thiooxidans or Thiobacillus ferrooxidans) and the addition of energy source (S 0 or Fe(II)) on the bioleaching of metals from sewage sludge has been investigated under laboratory conditions using shake flasks. The results show that metal solubilization was better accomplished if additional energy source is supplemented to the microorganisms and that T. thiooxidans furnishes, in general, more adequate conditions for the bioleaching than T. ferrooxidans. At a total solids concentration of 70 gL −1 (originally present in the sludge) pH drop and ORP increase are attenuated, so metal solubilization is negatively affected. It was also demonstrated that if lead (Pb) solubilization is to be achieved, than a special combination of microorganism/energy source must be applied.
ISSN:1093-4529
1532-4117
DOI:10.1081/ESE-100103761