In:
Water Environment Research, Wiley, Vol. 82, No. 11 ( 2010-11), p. 2219-2228
Abstract:
The bioleaching process, including acidification and solubilization of heavy metals, is a promising method for removing heavy metals from industrial waste sludge. Solubilization of heavy metals in industrial waste sludge is governed by adding elemental sulfur. A sulfur concentration exceeding 0.5% (w/v) inhibits sulfate production and the activity of acidophilic bacteria. Sulfate production was described well by a substrate inhibition expression in Haldane's kinetics. After 15 days of bioleaching, 79 to 81% copper, 50 to 69% lead, and 49 to 69% nickel were solubilized from sludge with a sulfur concentration of 0.5 to 1.0% (w/v). Experimental results indicated that the optimal sulfur concentration for the maximum solubilization rate of copper and nickel was 0.5% (w/v) and 1.0% (w/v) for lead. The profiles of denaturing gradient gel electrophoresis confirmed that indigenous acidophilic Acidithiobacilli ( A. thiooxidans and A. ferrooxidans ) existed and were the dominant species in the bioleaching process.
Type of Medium:
Online Resource
ISSN:
1061-4303
,
1554-7531
DOI:
10.2175/106143010X12609736966720
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1098976-6
detail.hit.zdb_id:
2051010-X
Permalink