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Heavy metal removal from contaminated sludges with dissolved sulfur dioxide in combination with bacterial leaching
Citation Link: https://doi.org/10.15480/882.410
Publikationstyp
Conference Paper
Date Issued
1983
Sprache
English
Author(s)
TORE-DOI
Citation
International Conference Heavy Metals in the Environment, Heidelberg, September 1983, Edinburgh 1983, pp. 952-5
Treatment of dredged sludge from the Hamburg harbour area with sulfurous acid (6%) shows nearly complete removal of Cd, Zn, and Mn within the first 10 minutes. Within 1 hour more than 50% of Cr, Ni, Pb and Hg are mobilized; dissolution of Cu and Fe reaches about 40%. The capability of certain bacteria (Thiobacillus thiooxidans and Thiobacillus ferrooxidans) to oxidize sulfur and ferrous iron respectively, while decreasing the pH value from 4-5 to about 2 was utilized for enhancing dissolution of metals from dredged sludge. Acidification with sulfurous acid to pH 4 and following bacterial leaching solubilized the following metal percentages from the dredged material: Cd and Co = 98%, Zn = 95%, Mn = 91%, Cu = 84%, Ni = 66%, Cr = 45%, Fe = 27% and Pb = 17 %.
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