DOI: 10.1016/j.watres.2017.11.016
Scopus记录号: 2-s2.0-85033587792
论文题名: Elimination of chlorine-refractory carbamazepine by breakpoint chlorination: Reactive species and oxidation byproducts
作者: Wang W.-L. ; Wu Q.-Y. ; Du Y. ; Huang N. ; Hu H.-Y.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 129 起始页码: 115
结束页码: 122
语种: 英语
英文关键词: Adsorbable organic halide
; Breakpoint chlorination
; Carbamazepine
; Cytotoxicity
; Radical species
Scopus关键词: Amides
; Amines
; Byproducts
; Chlorine
; Cytotoxicity
; Magnetic moments
; Refractory materials
; Breakpoint
; Carbamazepine
; Decomposition rate
; Organic halides
; Oxidation by-products
; Pseudo steady state
; Radical scavengers
; Radical species
; Chlorination
; ammonia
; carbamazepine
; chloramine derivative
; chlorine
; nitrobenzene
; carbamazepine
; chloride
; chlorine
; nitrogen
; adsorption
; ammonia
; chlorine
; dechlorination
; decomposition
; experimental study
; halide
; inhibition
; oxidation
; performance assessment
; pollutant removal
; reactive oxygen species
; toxicity
; water temperature
; Article
; chlorination
; cytotoxicity
; decomposition
; electron spin resonance
; elimination parameters
; microinjection
; oxidation
; pH
; pollutant
; priority journal
; reaction time
; chemistry
; halogenation
; kinetics
; oxidation reduction reaction
; synthesis
; water management
; Ammonia
; Carbamazepine
; Chloramines
; Chlorides
; Chlorine
; Halogenation
; Hydrogen-Ion Concentration
; Kinetics
; Nitrogen
; Oxidation-Reduction
; Water Purification
英文摘要: Breakpoint chlorination can be commonly observed in the chlorination of water treatments when ammonia is present. In this study, it was found that breakpoint chlorination can remarkably eliminate a ubiquitous and chlorine-refractory micropollutant, carbamazepine (CBZ), with the removal of 72% at neutral condition. At neutral pH, low CBZ elimination was observed at a chlorine/ammonia molar ratio (Cl/N) of 1.0 and higher CBZ elimination was observed as Cl/N ratio increased from 1.0 to 1.6 (breakpoint), indicating that CBZ elimination was closely related to the generation and decomposition of chloramines. The chloramines generation and decomposition rates were affected by the pH, so that the CBZ elimination rate was highest at pH 7.0 and lower in acidic and basic solutions (pH 5.5 and pH 9.5, respectively). The CBZ elimination at pH 7.0 was 72.4% after 10 min of breakpoint chlorination, while reaction times about 30 min and 60 min were required to achieve the same elimination at pH 5.5 and pH 9.5, respectively. Breakpoint chlorination of CBZ was strongly suppressed by radical scavenger tBuOH and moderately suppressed by N2 purging, the inhibiting ratios being 87.7% and 27.8% at breakpoint, respectively. Electron spin resonance experiments suggested that unidentified radicals were generated by breakpoint chlorination. The [rad]OH and unidentified radical species contributions to CBZ elimination were <23.7% and >76.3%, respectively, when a pseudo steady state breakpoint chlorination was performed in a microinjection system with nitrobenzene as [rad]OH probe. Although CBZ were efficiently eliminated, breakpoint chlorination of CBZ generated adsorbable organic chlorine. The cytotoxicity of the CBZ solution was therefore increased by breakpoint chlorination, suggesting that biological risk caused by the breakpoint chlorination of micropollutants should be taken into consideration. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113084
Appears in Collections: 气候减缓与适应
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作者单位: Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, Beijing, 100084, China; Shenzhen Laboratory of Microorganism Application and Risk Control, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China; Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen, 518055, China
Recommended Citation:
Wang W.-L.,Wu Q.-Y.,Du Y.,et al. Elimination of chlorine-refractory carbamazepine by breakpoint chlorination: Reactive species and oxidation byproducts[J]. Water Research,2018-01-01,129