Sunlight-mediated CaO2 inactivation of pathogen indicator organisms in surface water system: Roles of reactive species, characterization of pathogen inactivation

Zhang，Shuwen1,2; Zheng，Ming3; Yang，Ge1,2; Zhang，Ting2; Magnuson，Jason T.4; Chen，Honghong2; Zheng，Chunmiao2; Qiu，Wenhui1,2

2023-04-15

10.1016/j.watres.2023.119756

WATER RESEARCH   Impact Factor & Quartile

0043-1354

1879-2448

In the era of the current epidemic, it is urgent to control pathogens in sewage, eliminate the source of infection, and optimize the technology for killing pathogens. Combining calcium peroxide (CaO) with sunlight is considered a potentially efficient, economical, and eco-friendly method for pathogen-contaminated water remediation. This paper evaluated the solar activating properties of CaO for inactivating pathogenic indicators and explored the roles of reactive species contributing to pathogen inactivation. Moreover, these reactive species’ average steady-state concentrations and second-order reaction rate were tentatively explored, and mechanistic model for photoinactivation were establishment. Pathogen's inactivation was mainly attributed to direct photoinactivation (13∼50%) and exogenous indirect mechanisms with corresponding contributions of reactive species, i.e., OH (14∼23%), O (12∼28%), •OH (20∼32%), O (12∼16%), and HO (6∼11%). Furthermore, cell membrane rupture and DNA damage were observed by transmission electron microscopy (TEM) and agarose gel electrophoresis (AGE) experiments. Among experiments on common aqueous constituents influencing photoinactivation, copper and iron ions were found to promote a pathogen-inactivating ability of the system, while fulvic acids (FA) and humic acid (HA) had the opposite effect. This study revealed the potential of CaO/sunlight to inactivate pathogens and laid a foundation for its application in inactivating pathogens in surface water.

Calcium peroxide Photoinactivation Reactive species Second order reaction Surface water

SCI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundationof China["42077223","42277266"] ; National Key Research and Development Program of China[2021YFA1202500] ; Shenzhen Science and Technology Innovation Committee["20220814233432001","KQTD2016022619584022","KCXFZ20201221173410029"] ; State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012] ; Guangdong Basic and Applied Basic Research Foundation[2020A1515010891]

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:000952402900001

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENT/ECOLOGY

2-s2.0-85149044908

Scopus

1.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Key Laboratory of Organic Compound Pollution Control Engineering,School of Environmental and Chemical Engineering,Shanghai University,Shanghai,200444,China
4.Department of Chemistry,Bioscience and Environmental Engineering,University of Stavanger,Stavanger,4021,Norway

Zhang，Shuwen,Zheng，Ming,Yang，Ge,et al. Sunlight-mediated CaO2 inactivation of pathogen indicator organisms in surface water system: Roles of reactive species, characterization of pathogen inactivation[J]. WATER RESEARCH,2023,233.

Zhang，Shuwen.,Zheng，Ming.,Yang，Ge.,Zhang，Ting.,Magnuson，Jason T..,...&Qiu，Wenhui.(2023).Sunlight-mediated CaO2 inactivation of pathogen indicator organisms in surface water system: Roles of reactive species, characterization of pathogen inactivation.WATER RESEARCH,233.

Zhang，Shuwen,et al."Sunlight-mediated CaO2 inactivation of pathogen indicator organisms in surface water system: Roles of reactive species, characterization of pathogen inactivation".WATER RESEARCH 233(2023).