Reactive Nitrogen Species Mediated Inactivation of Pathogenic Microorganisms during UVA Photolysis of Nitrite at Surface Water Levels

Yongyi Wang; Ran Yin; Zhuoyun Tang

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Reactive Nitrogen Species Mediated Inactivation of Pathogenic Microorganisms during UVA Photolysis of Nitrite at Surface Water Levels

机译：Reactive Nitrogen Species Mediated Inactivation of Pathogenic Microorganisms during UVA Photolysis of Nitrite at Surface Water Levels

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UVA photolysis of nitrite(NO2) occurs in a number of natural and engineered aquatic systems.This study reports for the first time that pathogenic microorganisms can be effectively inactivated during the coexposure of UVA irradiation and NO_2~-under environmentally relevant conditions.The results demonstrated that more than 3 log inactivation of Escherichia coli K-12,Staphylococcus aureus,and Spingopyxis sp.BM1-1 was achieved by UVA photolysis of 2.0 mg-N L~(-1) of NO_2~-in synthetic drinking water and real surface water.The inactivation was mainly attributed to the reactive species generated from UVA photolysis of NO_2~-rather than UVA irradiation or NO_2~-oxidation alone.The inactivation was predominantly contributed by the reactive nitrogen species(NO2· and ONOO~-/HOONO) instead of the reactive oxygen species(HO· or O_2~(·-)).A kinetic model to simulate the reactive species generation from UVA photolysis of NO_2~-was established,validated,and used to predict the contributions of different reactive species to the inactivation under various environmental conditions.Several advanced tools(e.g.,D2O-labeling with Raman spectroscopy) were used to demonstrate that the inactivation by the UVA/NO_2~-treatment was attributed to the DNA destruction by the reactive nitrogen species,which completely suppressed the viable but nonculturable(VBNC) states and the reactivation of bacteria.This study highlights a novel process for the inactivation of pathogenic microorganisms in water and emphasizes the critical role of reactive nitrogen species in water disinfection and purification.

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《Environmental Science & Technology: ES&T》 |2022年第17期|12542-12552|共11页
作者
Yongyi Wang; Ran Yin; Zhuoyun Tang;
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作者单位

School of Environmental Science and Engineering Sun Yat-sen University,Guangzhou S1027S,China;

Department of Civil and Environmental Engineering,The Hong Kong University of Science and Technology,Kowloon 999077 Hong Kong China;

School of Environmental Science and Engineering Sun Yat-sen University,Guangzhou 510275,China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
disinfection; UVA; nitrite; reactive nitrogen species; dark repair;

Reactive Nitrogen Species Mediated Inactivation of Pathogenic Microorganisms during UVA Photolysis of Nitrite at Surface Water Levels

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