HSING-CHENG HSIYu, Tsung HsienTsung HsienYu2019-09-262019-09-262007-04-0100456535https://scholars.lib.ntu.edu.tw/handle/123456789/425174https://www.scopus.com/inward/record.uri?eid=2-s2.0-33846873268&doi=10.1016%2fj.chemosphere.2006.10.006&partnerID=40&md5=ade882b7497e3e74af3d8ea98d102b62Leachability of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from raw and solidified air pollution control (APC) residues with selected solvents, including acetic acid, simulated acid rain, humic acid, linear alkylbenzene sulfonate (LAS) and n-hexane was investigated. High-chlorinated PCDD/F congeners were observed in all leachates of raw APC residue samples, with the largest total leaching concentration (61.60 ng m -3 ; 0.30 ng I-TEQ m -3 ) from treatment with humic acid. Low-chlorinated congeners were mainly leached with LAS and n-hexane. Solidification and stabilization (S/S) processes with cement and sulfur-containing chelating agent decreased the leachability of PCDD/Fs by up to 98% with humic acid and LAS as solvents. However, S/S processes enhanced the leachability of both high- and low-chlorinated PCDD/F congeners with n-hexane as the solvent, which largely increased the toxic equivalent quantity of leachates. These results suggest that conventional S/S processes may effectively restrain the release of PCDD/Fs when APC residues are leached with rain water or natural organic compounds (e.g., humic acid), but may have a deteriorated effect when APC residues are leached with nonpolar organic solvents (e.g., n-hexane) coexisting in the landfill sites. © 2006 Elsevier Ltd. All rights reserved.enHumic acid | Linear alkylbenzene sulfonate | n-Hexane | PCDD/F | Solidification[SDGs]SDG6[SDGs]SDG11journal article10.1016/j.chemosphere.2006.10.006171099222-s2.0-33846873268WOS:000245529100021https://api.elsevier.com/content/abstract/scopus_id/33846873268