1. Recovery of heavy metals from industrial sludge using various acid extraction approaches.
- Author
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Wu, C. H., Kuo, C. Y., and Lo, S. L.
- Subjects
- *
HEAVY metals , *SEWAGE sludge , *INDUSTRIAL wastes , *EXTRACTION (Chemistry) , *LEACHING , *WASTE minimization - Abstract
Heavy metals were removed from industrial sludge by traditional and microwave-assisted acid extraction approaches. The effects of acid concentration, extraction time, sludge particle size and solid/liquid (S/L) ratio on copper-extraction efficiency were assessed. Leaching with increased acid concentrations increased the yield of heavy metals from the industrial sludge. In microwaveassisted acid extraction, reducing the S/L ratio and sludge particle size increased copperextraction efficiency. These experimental findings indicate that S/L ratio most strongly influenced microwave-assisted acid extraction. Both traditional and microwave-assisted acid extraction demonstrate that sulfuric acid was an effective extractant, and the copper fraction in extracted sludge shifted from being primarily bound to Fe-Mn oxides and organic-matter partition, to being mostly bound to organic matter, remaining as a residue during acid extraction. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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