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DBP formation from degradation of DEET and ibuprofen by UV/chlorine process and subsequent post-chlorination

查看全文 作　　者：Ehsan [1]Aghdam;Yingying [1]Xiang;Jianliang [1]Sun;Chii [1,2]Shang;Xin [3]Yang;Jingyun [3]Fang 高影响力作者 机构地区：[1]Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Kowioon, Hong Kong, China;[2]Hong Kong Branch of the Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China;[3]School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2017年第29卷第8期,共9页高影响力期刊 基　　金：supported by the Hong Kong Research Grant Council (grant number 16208914) 摘　　要：The formation of disinfection by-products(DBPs) from the degradation of N,N-diethyl-3-methyl benzoyl amide(DEET) and ibuprofen(IBP) by the ultraviolet irradiation(UV)/chlorine process and subsequent post-chlorination was investigated and compared with the UV/H_2O_2 process.The pseudo first-order rate constants of the degradation of DEET and IBP by the UV/chlorine process were 2 and 3.1 times higher than those by the UV/H_2O_2 process, respectively, under the tested conditions. This was due to the significant contributions of both reactive chlorine species U(RCS) and hydroxyl radicals(HO) in the UV/chlorine process. Trichloromethane, 1,1,1-trichloro-2-propanone and dichloroacetic acid were the major known DBPs formed after 90% of both DEET and IBP that were degraded by the UV/chlorine process. Their yields increased by over 50%after subsequent 1-day post-chlorination. The detected DBPs after the degradation of DEET and IBP comprised 13.5% and 19.8% of total organic chlorine(TOCl), respectively, and the proportions increased to 19.8% and 33.9% after subsequent chlorination, respectively. In comparison to the UV/H_2O_2 process accompanied with post-chlorination, the formation of DBPs and TOCl in the UV/chlorine process together with post-chlorination was 5%–63% higher,Ulikely due to the generation of more DBP precursors from the attack of RCS, in addition to HO. 关 键 词：DBPS 紫外线 避蚊胺 布洛芬 加氯 降解 消毒副产物 反应速率常数
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