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题名: Transformation of humic acid and halogenated byproduct formation in UV-chlorine processes
作者: Li, Tong; Jiang, Yan; An, Xiaoqiang; Liu, Huijuan; Hu, Chun; Qu, Jiuhui
刊名: WATER RESEARCH
出版日期: 2016-10-01
卷号: 102, 期号:0, 页码:421-427
关键词: UV-chlorine ; Hydroxyl radical ; Chlorine radical ; Humic acid ; Disinfection byproducts
DOI: 10.1016/j.watres.2016.06.051
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: The synergistic effect of ultraviolet light (UV) and chlorine on the structural transformation of Humic Acid (HA) and formation of chloro-disinfection byproducts (DBPs) in water were investigated, with chlorination as a reference. The transformation and mineralization of HA were enhanced upon co-exposure to UV and chlorine. Electron spin resonance (ESR) studies revealed that hydroxyl radical (center dot OH) and chlorine radical (center dot Cl) were predominant active species in a pH range from 4 to 7, while center dot Cl dominated at pH 2 and pH higher than 7. The impact of different radicals on the transformation of HA was investigated by UV254, fluorescence and TOC measurements. center dot OH were found to be responsible for the removal of chromophoric groups and mineralization of HA, while center dot Cl mainly reacted with HA and intermediates from HA degradation. Due to the competitive and synergistic reaction of center dot OH and center dot Cl with HA, higher removal of HA and lower formation of chloro-DBPs appeared in UV-chlorine than chlorination, thus the combined UV-chlorine processes should be a promising method for water purification. (C) 2016 Published by Elsevier Ltd.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36220
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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