Enhanced formation of trihalomethane disinfection byproducts from halobenzoquinones under combined UV/chlorine conditions  

作　　者：He Zhao Ching-Hua Huang Chen Zhong Penghui Du Peizhe Sun 

机构地区：[1]Beijing Engineering Research Center of Process Pollution Control,Division of Environment Technology and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Civil and Environmental Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA [3]State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [4]School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Frontiers of Environmental Science & Engineering》2022年第6期109-119,共11页环境科学与工程前沿（英文）

基　　金：supported partly by National Natural Science Foundation of China(Grant No.51978643);Youth Innovation Promotion Association,CAS(No.2014037)。

摘　　要：Halobenzoquinones(HBQs)are highly toxic disinfection byproducts(DBPs)and are also precursors of other DBPs such as trihalomethanes(THMs).The formation of THMs from HBQs during chlorine-only and UV/chlorine processes with or without bromide was investigated experimentally.Density functional theory(DFT)reactivity descriptors were also applied to predict the nucleophilic/electrophilic reactive sites on HBQs and intermediates.The results were combined to explain the different behaviors of 2,6-dichloro-1,4-benzoquinone(2,6-DCBQ)and tetrachloro-1,4-benzoquinone(TCBQ)and to propose mechanism for the promoting roles of UV and hydroxylation of HBQs in THMs formation.Under UV/chlorine,UV significantly enhanced THMs formation from 2,6-DCBQ compared to chlorine-only,mainly due to the production of OH-DCBQ^(*).Excited 2,6-DCBQ^(*)by UV benefited nucleophilic hydrolysis to produce OH-DCBQ^(*),which favored electrophilic attack by chlorine,thereby inducing more THMs formation.UV/chlorine modestly promoted THMs formation from TCBQ compared to chlorine-only.Hydroxylation of TCBQ and UV irradiation were both important in promoting THMs formation due to the high electrophilic property of OH-TCBQ and TCBQ^(*).Meanwhile,hydroxylation of HBQs and CHCl3 formation were enhanced at higher pH.This work suggested that enhanced formation of THMs from HBQs should be considered in the application of combined UV and chlorine processes.

关 键 词：Halobenzoquinone TRIHALOMETHANE Chlorine disinfection UV irradiation Disinfection byproducts Combined UV/chlorine 

分 类 号：X70[环境科学与工程—环境工程]