UV activated monochloramine promotes metribuzin degradation and disinfection by-products formation

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	UV activated monochloramine promotes metribuzin degradation and disinfection by-products formation
	Wang, Yan; Dong, Huiyu; Wu, Zhengdi; Li, Mengkai; Li, Jin; Qiang, Zhimin
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-04-01
卷号	385 页码:1-9
关键词	UV/monochloramine Metribuzin degradation Disinfection by-products formation Water treatment
ISSN号	1385-8947
英文摘要	UV/monochloramine (MC) is a new advanced oxidation process for micro-pollutants degradation. This study investigated the degradation kinetics and mechanism of metribuzin (MBZ) by UV/MC as well as the variations of disinfection by-products (DBPs) formation. The pseudo-first-order rate constant of MBZ degraded by UV/MC (0.084 min(-1)) was about 3.6 times the sum of those by UV (0.023 min(-1)) and MC ( < 0.001 min(-1)) alone. The accelerated degradation by UV/MC was mainly owed to the formed reactive chlorine species (RCSs) and HO center dot. The degradation rate was pH-dependent, which increased from 0.081 to 0.148 min(-1) with pH decreasing from 8.5 to 5.5, due to varied species contribution rates. HO center dot and RCSs played dominant roles under pHs > 7.0 and pHs <= 7.0, respectively. The contribution rate of RCSs at pH 5.5 (0.112 min(-1)) was 5.3 times that at pH 8.5 (0.021 min(-1)). Enhanced DBPs formation was observed in UV/MC process. Trichloromethane, trichloronitromethane and dichloroacetonitrile were simultaneously formed, and their total concentration with 30 min UV/MC treatment (19.0 mu g L-1) was 1.4 times those formed with 1 min UV/MC treatment (13.7 mu g L-1). The DBPs formation potential in post-chlorination following 1 min UV/MC treatment (55.7 mu g L-1) was 7.6, 13.8 and 2.4 times those formed in chlorination (7.31 mu g L-1), chloramination (4.02 mu g L-1), and post-chlorination following 30 min UV irradiation (23.6 mu g L-1 ), respectively. With the analysis of transformation by-products, the pathways of MBZ degradation and DBPs formation were proposed. Although UV/MC accelerated MBZ degradation, the enhanced DBPs formation should be eagerly concerned.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45383]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Wang, Yan,Dong, Huiyu,Wu, Zhengdi,et al. UV activated monochloramine promotes metribuzin degradation and disinfection by-products formation[J]. CHEMICAL ENGINEERING JOURNAL,2020,385:1-9.
APA	Wang, Yan,Dong, Huiyu,Wu, Zhengdi,Li, Mengkai,Li, Jin,&Qiang, Zhimin.(2020).UV activated monochloramine promotes metribuzin degradation and disinfection by-products formation.CHEMICAL ENGINEERING JOURNAL,385,1-9.
MLA	Wang, Yan,et al."UV activated monochloramine promotes metribuzin degradation and disinfection by-products formation".CHEMICAL ENGINEERING JOURNAL 385(2020):1-9.