Investigation of the degradation of pentachlorophenol in sandy soil via low-temperature pyrolysis

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Title:	Investigation of the degradation of pentachlorophenol in sandy soil via low-temperature pyrolysis
Authors:	張木彬;Thuan, Ngo Thi;Chang, Moo Been
Contributors:	工學院環境工程研究所
Keywords:	Air Pollutants - analysis;Applied sciences;Benzofurans - analysis;byproducts;combustion;dechlorination;Decontamination. Miscellaneous;desorption;Dibenzofurans, Polychlorinated;Dioxin formation;energy costs;Exact sciences and technology;heat;heat treatment;Hot Temperature;Low temperature;Nitrogen - chemistry;Pentachlorophenol;Pentachlorophenol - analysis;Pentachlorophenol - chemistry;phenols;polluted soils;Pollution;polychlorinated dibenzodioxins;Polychlorinated Dibenzodioxins - analogs & derivatives;Polychlorinated Dibenzodioxins - analysis;polychlorinated dibenzofurans;Pyrolysis;sandy soils;Silicon Dioxide;Soil - analysis;Soil - chemistry;Soil and sediments pollution;Soil Pollutants - analysis;Soil Pollutants - chemistry;Taiwan;temperature;Waste Management - methods
Date:	2012-08-30
Issue Date:	2026-04-23 15:04:35 (UTC+8)
Publisher:	Elsevier;Kidlington: Elsevier B.V
Abstract:	摘要： ► PCP-spiked soil as representative soil sample of An Shun site in Taiwan was remediated by low-temperature pyrolysis. ► 90% PCP and PCP byproducts were removed from soil at 350°C for 40min. ► The PCP decay rate constant from sandy soil increased exponentially in the range of 200–400°C. ► Very low level of dioxins was found in soil and gas phase. Thermal treatments are the primary technologies used to simultaneously remove high-concentrations of pentachlorophenol (PCP) and polychlorinated dibenzo dioxins/furans (PCDD/Fs) from contaminated soils such as the An-Shun soil, Taiwan. However, the high cost of energy required and the potential formation of dioxins during the incineration/combustion of PCP have limited their applications. In this study, an investigation of PCP pyrolysis in sandy soil at a relatively low temperature range (200–400°C) was conducted. Temperature and heating time required to achieve the maximum removal efficiency of PCP and its byproducts from soil were investigated. Additionally, primary pathways leading to PCP removal from sandy soil were studied. The experimental results showed that a significant portion of PCP (>90%) and its byproducts were removed from the soil at 350°C with a treatment time of 40min. The PCP decay rate constant increased exponentially from 0.20min−1 to 1.98min−1 as the operating temperature was increased from 200°C to 400°C. While pyrolysis and desorption are the main degradation pathways, detection of lower chlorinated phenols in the gas/soil indicates that dechlorination of PCP occurs during the degradation process. Low levels of PCDD/Fs were detected in the soil/gas during the pyrolysis of PCP-contaminated soils. 其他題名： J Hazard Mater 出版者： Kidlington: Elsevier B.V 出版日期： 2012-08-30 出處： Journal of hazardous materials, 2012-08, Vol.229-230, p.411-418 版權： 2012 Elsevier B.V. 版權： 2015 INIST-CNRS 版權： Copyright © 2012 Elsevier B.V. All rights reserved. 識別號： ISSN: 0304-3894 識別號： ISSN: 1873-3336 識別號： EISSN: 1873-3336 識別號： DOI: 10.1016/j.jhazmat.2012.06.027 識別號： PMID: 22770752 識別號： CODEN: JHMAD9
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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