The organic matter in International Humic Substances Society Natural Organic Matter (IHSS NOM) water exposed to ultraviolet (UV) irradiation and chlor(am)ine sequentially under practically relevant conditions was characterized based on fluorescence spectra. IHSS NOM water exposed to UV irradiation or chlor(am)ine alone was also evaluated. Both chlor(am)ine alone and UV/chlor(am)ine exposure showed similar chlor(am)ine demand and fluorescence spectra. UV irradiation and UV/chlorine exposure diminished the fluorescence intensity of IHSS NOM water, while UV/chloramine exposure resulted in increased fluorescence intensity. When compared with the results obtained following chlor(am)ination alone, IHSS NOM water showed decreased chlorine decay and increased chloramine decay after UV irradiation/chlor(am)ination. Additionally, IHSS NOM water exposed to UV/chloramine and chloramine showed less disinfection by-product (DBP) formation than water subjected to UV/chlorine and chlorine. Overall, these findings indicate that UV irradiation degrades NOM molecules to low-molecular-weight fractions, facilitating the subsequent reaction with chlor-(am)ine. However, chlorine and chloramine play different roles in the reaction. Chlorine degradation and substitution dominates the process of UV/chlorine exposure, while chloramine substitution is the major reaction during UV/chloramine exposure.
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Research Article|
September 12 2013
Fluorescence characteristics of natural organic matter in water under sequential exposure to UV irradiation/chlor(am)ination
Qianjun Guo;
Qianjun Guo
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China and Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
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Zaili Zhang;
Zaili Zhang
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China and Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
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Zhengbo Ma;
Zhengbo Ma
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China and Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
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Yongmei Liang;
Yongmei Liang
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China and Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
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Wei Liu
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China and Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
E-mail: esslw@mail.sysu.edu.cn
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Water Supply (2014) 14 (1): 22–30.
Article history
Received:
January 31 2013
Accepted:
May 21 2013
Citation
Qianjun Guo, Zaili Zhang, Zhengbo Ma, Yongmei Liang, Wei Liu; Fluorescence characteristics of natural organic matter in water under sequential exposure to UV irradiation/chlor(am)ination. Water Supply 1 February 2014; 14 (1): 22–30. doi: https://doi.org/10.2166/ws.2013.166
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