Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil

NCUIR > Engineering College > Graduate Institute of Environmental Engineering > journal & Dissertation > Item 987654321/108837

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/108837

Title:	Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil
Authors:	張木彬;Hung, Pao-Chen;Chang, Shu-Hao;Ou-Yang, Chia-Chien;Chang, Moo-Been
Contributors:	工學院環境工程研究所
Keywords:	air pollution;Benzofurans - chemistry;Chlorine - chemistry;Cleaning;Contamination;Continuous pilot-scale thermal system (CPTS);Dechlorination;dibenzofuran;Dibenzofurans, Polychlorinated;Dioxin-like congeners;Discharge;Environmental Restoration and Remediation - methods;Exhaust;Hot Temperature;Mercury;Mercury (metal);Mercury - chemistry;Oxygen-deficient condition;Pentachlorophenol;Pentachlorophenol - chemistry;polluted soils;pollution control;Polychlorinated Dibenzodioxins - analogs & derivatives;Polychlorinated Dibenzodioxins - chemistry;polychlorinated dibenzofurans;Soil (material);Soil Pollutants - chemistry;Soil remediation;Taiwan;temperature;tetrachlorodibenzo-p-dioxin
Date:	2016-02-01
Issue Date:	2026-04-23 15:09:15 (UTC+8)
Publisher:	Elsevier Ltd.;England: Elsevier Ltd
Abstract:	摘要： Pentachlorophenol (PCP), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), and mercury were simultaneously removed from heavily contaminated soil using a continuous pilot-scale thermal system (CPTS). Operating the system at 700 °C with 22 min of retention time ensured that the residual contaminants in remediated soil are lower in concentration than the soil standards of Taiwan EPA require. Both PCP and PCDD/Fs are effectively destroyed during the treatment at high temperatures in the CPTS, but significant dechlorination of PCDD/Fs is also found, resulting in lower net destruction efficiencies of TCDD/F and PeCDD/F-congeners, compared with those of highly chlorinated Hx-, Hp- and OCDD/F congeners. Moreover, 2,3,7,8-TetraCDD is significantly formed if the retention time is not long enough for total destruction. Inadequate reaction time (or retention time) even may lead to a rise in TEQ-value due to incomplete dechlorination. Mercury is significantly desorbed from contaminated soil and discharged through the exhaust. For PCP and PCDD/Fs, the exhaust discharge percentages including both the remediated soil and the exhaust are <0.03% and 1.14% of the input, respectively, achieved with 700 °C and 33 min retention time. In contrast, some 97.8% of input mercury rate is desorbed and discharged via the exhaust, so that the latter should be carefully cleaned via efficient air pollution control devices, whereas this contribution focuses on the conditions required for reaching adequate soil cleaning. •Pyrolysis is applied for simultaneous removal of multi-pollutants from soil.•An innovative continuous system for soil remediation is developed and applied.•High PCP, PCDD/F and mercury removal efficiencies are obtained.•Operating the system at 700 °C with retention time of 22 min meets the regulation.•Dechlorination is an important pathway for PCDD/F degradation. 其他題名： Chemosphere 出版者： England: Elsevier Ltd 出版日期： 2016-02 出處： Chemosphere (Oxford), 2016-02, Vol.144, p.50-58 版權： 2015 Elsevier Ltd 版權： Copyright © 2015 Elsevier Ltd. All rights reserved. 識別號： ISSN: 0045-6535 識別號： ISSN: 1879-1298 識別號： EISSN: 1879-1298 識別號： DOI: 10.1016/j.chemosphere.2015.08.058 識別號： PMID: 26347926
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	34	View/Open

社群 sharing

Loading...