PCDD/PCDF behavior in low-temperature pyrolysis of PCP-contaminated sandy soil

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題名:	PCDD/PCDF behavior in low-temperature pyrolysis of PCP-contaminated sandy soil
作者:	張木彬;Thuan, Ngo Thi;Dien, Nguyen Thanh;Chang, Moo Been
貢獻者:	工學院環境工程研究所
關鍵詞:	analogs & derivatives;Applied sciences;atmosphere;Benzofurans;Benzofurans - chemistry;byproducts;chemistry;Chlorination;Congeners;dechlorination;Decontamination. Miscellaneous;desorption;Dioxins;emissions;Exact sciences and technology;Furans;Gas Chromatography-Mass Spectrometry;heat treatment;Low temperature;nitrogen;PCDD/F behavior;Pentachlorophenol;Pentachlorophenol - chemistry;Pollution;polychlorinated dibenzodioxins;Polychlorinated Dibenzodioxins - analogs & derivatives;Polychlorinated Dibenzodioxins - chemistry;polychlorinated dibenzofurans;Pyrolysis;Sandy soils;Silicon Dioxide;Soil (material);Soil and sediments pollution;Soil Pollutants;Soil Pollutants - chemistry;Temperature
日期:	2013-01-05
上傳時間:	2026-04-23 15:07:05 (UTC+8)
出版者:	Elsevier;Kidlington: Elsevier B.V
摘要:	摘要： This study investigates the behavior of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) formation, dechlorination and destruction in PCP-contaminated sandy soil by low-temperature thermal treatment. Experimental tests were carried out in a nitrogen atmosphere in the temperature range of 200–400°C with a treatment time of 30min. 70% of PCP removal from the soil was achieved, resulting in 1436±230ng/kg, the highest PCDD/F formation at 250°C; however, the highest toxic concentration was measured around 4.20±0.62ngTEQ/kg at 300°C with 80% PCP removal from the soil. Further analysis has revealed that OCDD is the most dominant congener that is supposed to be formed from the pyrolysis of PCP, while OCDF is the second prevailing congener, possibly due to pyrolysis of 2,3,4,5-TeCP being a main byproduct of PCP pyrolysis. Detection of less chlorinated dioxins and furans over 300°C indicates the dechlorination of highly chlorinated dioxins and furans, especially octachlorinated dibenzo-p-dioxin (OCDD) at 350°C and 400°C. Desorption from soil was supposed as a main mechanism for the distribution of PCDD/Fs in the gaseous phase, and not much difference in dioxins and furan levels was observed at 350°C and 400°C in the gaseous phase. Therefore, 350°C is the most appropriate temperature to remove most PCP and PCDD/Fs from soil, as well as to meet PCDD/F emission standards (0.1ngI-TEQ/Nm3). ► Formation, dechlorination and destruction of PCDD/Fs were observed. ► The highest PCDD/F formation at 250°C while the highest toxicity was measured at 300°C. ► OCDD is the most dominant congener and OCDF is the second prevailing congener. ► PCDD/Fs can be removed and desorbed into gaseous phase with the acceptable level at 350°C. 其他題名： Sci Total Environ 出版者： Kidlington: Elsevier B.V 出版日期： 2013-01-15 出處： The Science of the total environment, 2013-01, Vol.443 (15), p.590-596 版權： 2012 Elsevier B.V. 版權： 2014 INIST-CNRS 版權： Copyright © 2012 Elsevier B.V. All rights reserved. 識別號： ISSN: 0048-9697 識別號： ISSN: 1879-1026 識別號： EISSN: 1879-1026 識別號： DOI: 10.1016/j.scitotenv.2012.11.014 識別號： PMID: 23220751 識別號： CODEN: STENDL
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