Effect of UV wavelength on humic acid degradation and disinfection by-product formation during the UV/chlorine process

Water Research
Ze-Chen GaoNai-Yun Gao

Abstract

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 (kobs) 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, kobs 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 (kobs, chlorine), and the synergistic effects of kobs, chlorine and chlorine quantum yields (Φchlorine) 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-ass...Continue Reading

Citations

Feb 16, 2020·Materials·Keren TrabelsiMario Pagliaro
Nov 28, 2020·Environmental Science and Pollution Research International·Alper AlverAhmet Kılıç
Feb 2, 2021·Environmental Science & Technology·Weiqiu ZhangJohn Crittenden
Nov 7, 2020·Journal of Hazardous Materials·Zhi LiuMohamed Gamal El-Din
Jul 28, 2021·Journal of Environmental Management·Nasim RafieiTejraj M Aminabhavi
Jul 30, 2021·Environmental Science and Pollution Research International·Erika JezMarco Contin
Sep 12, 2021·Environmental Science and Pollution Research International·Yiming Fang, Hiroshi Sakai

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