Kinetic modeling of ring byproducts during ozonation of pentachlorophenol in water

doi:10.1016/j.seppur.2011.02.026

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Engineering and Science (including master's program) > Periodical Articles > Item 310902800/27698

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题名:	Kinetic modeling of ring byproducts during ozonation of pentachlorophenol in water
作者:	Sung, M. Lee, S.Z. Chan, H.L.
贡献者:	環境工程與科學系
关键词:	Ozonation Pentachlorophenol Water Reclamation Byproducts Kinetic Model
日期:	2012-01-09
上传时间:	2014-03-21 16:18:02 (UTC+8)
出版者:	Elsevier Science Bv
摘要:	Pentachlorophenol (PCP) is a highly toxic material. It is hydrophobic and is recalcitrant to biological degradation. Improper use of PCP has caused serious soil and groundwater contamination problems worldwide, and posed threat to water reclamation processes. The objective of this study was to understand the effects of ozonation on the distributions of ring intermediates during the initial stage of oxidation reactions. Experiments were designed and conducted in a homogeneous condition. Molar ratios of ozone to PCP were controlled in the range from 0.05 to 1.3 at pH 6 to examine dosage effects. Three major ring intermediates quantified were tetrachloro-p-hydroquinone (TCHQ), tetrachloro-p-benzoquinone (TCBQ), and tetrachlorocatechol (TCCA). Transient distributions of these three compounds, together with chloride ions, were monitored. A degradation pathway was proposed and a set of kinetic equations was written accordingly. Rate constants in the kinetic model were obtained by optimizing against experimental data. Ozone dosage was found to be a factor controlling byproducts distributions. Finally, the dynamic sensitivities of rate constants were evaluated for each compound to understand their specific behaviors. (C) 2011 Elsevier B.V. All rights reserved.
關聯:	Separation And Purification Technology, 84(9,SI), 125-131
显示于类别:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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