We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Behavior of sequential extraction of lead from thermally treated lead(II)-doped alumina
- Authors
Wei, Yu-Ling; Huang, Yu-Ling
- Abstract
There are environmental concerns about emission of heavy metals in flue gases during incineration of hazardous wastes. Low temperature injection of sorbents has been suggested as a way to reduce the heavy metal content of the emitted gases. We investigated the extractive behavior of Pb in thermally treated Pb2+-doped alumina using the USEPA toxicity characteristics leachability procedure TCLP) and asequential extraction method to obtain information on the Pb-aluminareaction. Thermal treatment of Pb2+-doped alumina was in the 100 to 900 deg.C range for 10 to 60 min. Results indicated that the Pb2+-doped alumina treated at higher temperature for longer duration was resistant to the TCLP and to the sequential extraction for the first four fractions, but not for the residual fraction (Fraction 5). The relationship between total extracted Pb of the firstfour fractions and the TCLP concentration was strong (r = 0.993 for the 100 deg.C and r = 0.996 for the 500 deg.C treatments). Almost allof the doped Pb was distributed between conceptual fractions that were either bound to carbonates or were residual that was extracted with 10% HF and H2O2. The shift in distribution ofPb that was carbonate-bound to that bound in the residual fraction as treatment temperature increased from 100 to 500 deg.C was more thanthat which shifted from 500 to 900 deg.C. After treatment at 900 deg.C most of the Pb was associated with the residual fraction (indicating a strong sorption between Pb and alumina) and the TCLP concentration dropped to nondetectable levels.
- Subjects
HEAVY metals; LEAD
- Publication
Journal of Environmental Quality, 1998, Vol 27, Issue 2, p343
- ISSN
0047-2425
- Publication type
Article
- DOI
10.2134/jeq1998.00472425002700020014x