globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.02.004
Scopus记录号: 2-s2.0-85061769865
论文题名:
Effect of UV wavelength on humic acid degradation and disinfection by-product formation during the UV/chlorine process
作者: Gao Z.-C.; Lin Y.-L.; Xu B.; Xia Y.; Hu C.-Y.; Zhang T.-Y.; Cao T.-C.; Chu W.-H.; Gao N.-Y.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 154
起始页码: 199
结束页码: 209
语种: 英语
英文关键词: Disinfection by-products ; Humic acid ; Toxicity ; Ultraviolet light-emitting diode (UV-LED) ; UV wavelength ; UV/Chlorine
英文摘要: The efficiency of the ultraviolet (UV)/chlorine process strongly depends on UV wavelength because chlorine photolysis and its subsequent radical formation are highly wavelength-dependent. This study compared the degradation of humic acid (HA) during the UV/chlorine process by low pressure mercury lamp (LPUV, 254 nm) and ultraviolet light-emitting diode (UV-LED, 275 and 310 nm). The results indicated that HA degradation followed the pseudo-first-order kinetics, and the fluence-based degradation rate constants (k obs ) were significantly affected by UV wavelength and solution pH. HA degradation decreased greatly with increasing solution pH during the UV/chlorine process at 254 nm, while the opposite trend was observed at 275 and 310 nm. In the meantime, k obs decreased in the order of 275 nm > 254 nm > 310 nm at pH > 7.0. The changes of chlorine molar absorption coefficients at different UV wavelengths resulted in the variation of chlorine photodecay rates (k obs, chlorine ), and the synergistic effects of k obs, chlorine and chlorine quantum yields (Φ chlorine ) affected HA reduction. The formation of disinfection by-products (DBPs) during the UV/chlorine process was also evaluated. A significant suppression on DBP formation and DBP-associated calculated theoretical cytotoxicity were observed at 275 nm high UV fluence and alkaline pHs. These findings in this study demonstrate that UV wavelength at 275 nm is more suitable for HA degradation by the UV/chlorine advanced oxidation process in practical applications. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121943
Appears in Collections:气候变化事实与影响

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作者单位: State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan; College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China; School of Chemical Science and Engineering, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai, 200092, China

Recommended Citation:
Gao Z.-C.,Lin Y.-L.,Xu B.,et al. Effect of UV wavelength on humic acid degradation and disinfection by-product formation during the UV/chlorine process[J]. Water Research,2019-01-01,154
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