Evaluation of polychiorinated dibenzo-p-dioxins and dibenzofurans leachability from air pollution control residues with multiple extraction procedures
Journal
100th Annual Conference and Exhibition of the Air and Waste Management Association 2007, ACE 2007
Journal Volume
3
Pages
1608-1612
Date Issued
2007
Author(s)
Yu T.-H.
Abstract
This study examined the leaching characteristics of PCDD/Fs from raw and solidified APC residues using humic acid and n-hexane as leachants. PCDD/Fs were observed to stably retain in APC residues when these samples were multiply leached with humic acid and n-hexane. However, the leaching mechanisms of PCDD/Fs for samples treated with humic acid and n-hexane appeared to be different. Humic acid showed a stronger affinity to bind with highly chlorinated PCDD/Fs. Leaching of PCDD/Fs with n-hexane was, in contrast, primarily caused from the partition of hydrophobic PCDD/Fs between the APC residue surface and the liquid phase of n-hexane. S/S decreased the PCDD/F leachability at a leaching duration up to ∼90 h with humic acid. However, S/S significantly increased the PCDD/F leaching concentrations and rates with n-hexane. The toxicity of n-hexane leachates also markedly increased due to releasing a significant amount of low chlorinated PCDD/Fs after S/S. The effectiveness of activated carbon on inhibiting the PCDD/F release was also verified via both humic acid and n-hexane multiple leaching tests. © 2007 by the Air & Waste Management Association.
Other Subjects
Activated carbon; Biological materials; Carbon; Hexane; Leaching; Organic acids; Pollution control; Waste management; Air pollution control residues; Dibenzo p dioxins; Dibenzofurans; Leaching characteristics; Leaching concentrations; Leaching mechanism; Leaching test; Multiple extraction procedures; Air pollution control
Type
conference paper