Heavy metal removal from contaminated sludges with dissolved sulfur dioxide in combination with bacterial leaching

Publikationstyp
Conference Paper
Publikationsdatum
1983
Sprache
English
Author
Calmano, Wolfgang 
Ahlf, Wolfgang 
Förstner, Ulrich 
Institut
Umwelttechnik und Energiewirtschaft V-9 
DOI
10.15480/882.410
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/412
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 %.
Lizenz
http://doku.b.tu-harburg.de/doku/lic_ohne_pod.php
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