Alternate disinfection approaches or raise disinfectant dosages for sewage treatment plants to address the COVID-19 pandemic?From disinfection efficiency,DBP formation,and toxicity perspectives  

作　　者：Xiaobin Liao Xinyue Liu Yueyun He Xueping Tang Ruanjunjie Xia Yongjun Huang Wenhua Li Jing Zou Zhenming Zhou Mazhan Zhuang 

机构地区：[1]Institute of Municipal and Environmental Engineering,College of Civil Engineering,Huaqiao University,Xiamen 361021,China [2]Xiamen Institute of Environmental Science,Xiamen 361021,China [3]College of Biomedical Sciences,Huaqiao University,Xiamen 361021,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第9期115-128,共14页环境科学与工程前沿（英文）

基　　金：supported by the Youth Science and Technology Innovation Program of Xiamen Ocean and Fisheries Development Special Funds(China)(No.23YYST062QCB29);We would like to thank Instrumental Analysis Center of Huaqiao University(China)for intermediates detection using UPLC-QTOF/MS(Agilent 1290-6545,USA).

摘　　要：During the COVID-19 pandemic,most sewage treatment plants increased disinfectant dosages to inactivate pathogenic viruses and microorganisms more effectively.However,this approach also led to the production of more disinfection by-products(DBPs).To ensure both disinfection efficiency and a reduction in DBP formation,new disinfection protocols are required.In this study,the disinfection efficiency,DBP amounts,and toxicity changes resulting from ozone(O_(3)),ultraviolet(UV),chlorine(Cl_(2)),and their combined processes were examined.The results demonstrated that the O_(3)/UV/Cl_(2)combination achieved the highest disinfection efficiency.Chlorination produced the most DBPs,whereas UV treatment reduced the formation of trihalomethane(THM),halogenated ketones(HKs),haloacetic acids(HAA),dichloroacetonitrile(DCAN)and N-nitrosodimethylamine(NDMA)by 45.9%,52.6%,82.0%,67.95%,and 47%,respectively.O_(3)also significantly reduced their production by 99.1%,91.1%,99.5%,100%,and 35%.Intracellular organic matter(IOM)was identified as the primary DBP precursors,producing 2.94 times more DBPs than extracellular organic matter(EOM).The increased DBP formation during chlorination was attributed to IOM leakage and cell membrane damage,which was verified using scanning electron microscopy(SEM).The toxicities of DBPs were evaluated for six disinfection methods,revealing inconsistent results.The overall toxicities were assessed using zebrafish embryo experiments.Both evaluations indicated that chlorination alone was the least favorable method.In addition,the toxicities followed a sequence:Cl_(2)≈O_(3)/Cl_(2)>O_(3)>O_(3)/UV/Cl_(2)>UV>UV/Cl_(2).These findings can serve as a reference for sewage treatment plants in selecting appropriate disinfection methods to manage the COVID-19 epidemic from comprehensive perspective.

关 键 词：Sewage bacteria Disinfection by-products Toxicity OZONATION UV CHLORINATION 

分 类 号：R187[医药卫生—流行病学] X703[医药卫生—公共卫生与预防医学]