HSING-CHENG HSIWang, Lin ChiLin ChiWangYu, Tsung HsienTsung HsienYu2019-09-262019-09-262007-04-0100456535https://scholars.lib.ntu.edu.tw/handle/123456789/425172To assess the effectiveness of the injected activated carbon, cement, and sulfur-containing chelating agent in controlling polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) release from the surface of air pollution control (APC) residues, this study examined the leachability of PCDD/Fs from APC residues generated by municipal solid waste incinerators. Results showed that PCDD/Fs were stably retained in the APC residues when the samples were leached with acetic acid solution. Highly chlorinated PCDD/F homologues (i.e., hepta- and octa-CDDs and CDFs) were relatively easy to leach. The leaching percentages of PCDD/Fs from raw APC residue samples containing activated carbon were smaller than those from samples without activated carbon, especially when n-hexane was used as the leachant. These results indicate that the flue gas injected activated carbon not only controls PCDD/F emissions, but also suppresses the leachability of PCDD/Fs from the APC residues. Solidification/stabilization (S/S) processes with 30 wt% cement and 5 wt% sulfur-containing agent can additionally decrease the leachability of PCDD/Fs with humic acid. Using n-hexane as the leachant, S/S processes increased the leachability of PCDD/Fs. Various low chlorinated PCDD/F congeners were moreover leached out of the APC residue samples, markedly increasing the leachate toxicity. The enhancement of leachability and toxicity owing to S/S processes may negatively impact the environment when APC residues are exposed to nonpolar organic solvents. © 2006 Elsevier Ltd. All rights reserved.enAcetic acid | Fly ash | Humic acid | n-Hexane | PCDD/F | Stabilization[SDGs]SDG11[SDGs]SDG12journal articlehttps://api.elsevier.com/content/abstract/scopus_id/3384688441210.1016/j.chemosphere.2006.10.025171268802-s2.0-33846884412WOS:000245529100016https://api.elsevier.com/content/abstract/scopus_id/33846884412