Insight into the formation of iodinated tr ihalomethanes dur ing chlor ination,monochloramination, and dichloramination of iodide-containing water

作     者：Shuang Zhang Yi-Li Lin Tian-Yang Zhang Chen-Yan Hu Zhi Liu Zheng-Yu Dong Meng-Yuan Xu Bin Xu Shuang Zhang;Yi-Li Lin;Tian-Yang Zhang;Chen-Yan Hu;Zhi Liu;Zheng-Yu Dong;Meng-Yuan Xu;Bin Xu

作者机构：State Key Laboratory of Pollution Control and Resource ReuseKey Laboratory of Yangtze Water EnvironmentMinistry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological SecurityShanghai 200092China Department of SafetyHealth and Environmental Engineering“National”Kaohsiung University of Science and TechnologyKaohsiung 824Chinese Taipei College of Environmental and Chemical EngineeringShanghai University of Electric PowerShanghai 200090China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第7期

页      面：285-294页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：sponsored by Natural Science Foundation of China (Nos. 51978483 , 51778444 , 51808222) National Key Research and Development Program (No. 2021YFC3201303) 

主　　题：Inorganic chloramine Iodinated trihalomethanes(I-THMs) Chlorination Monochloramination Dichloramination Bromide to iodide ratio 

摘      要：In this study, the formation of iodinated trihalomethanes(I-THMs) was systematically evaluated and compared for three treatment processes-(i) chlorination,(ii) monochloramine, and(iii) dichloramination-under different p H conditions. The results demonstrated that ITHM formation decreased in the order of monochloramination dichloramination chlorination in acidic and neutral p H. However, the generation of I-THMs increased in the dichloramination chlorination monochloramination order in alkaline condition. Specifically, the formation of I-THMs increased as p H increased from 5 to 9 during chlorination and monochloramination processes, while the maximum I-THM formation occurred at pH 7 during dichloramination. The discrepancy could be mainly related to the stability of the three chlor(am) ine disinfectants at different p H conditions. Moreover, in order to gain a thorough insight into the mechanisms of I-THM formation during dichloramination, further investigation was conducted on the influencing factors of DOC concentration and Br/Imolar ratio. I-THM formation exhibited an increasing and then decreasing trend as the concentration of DOC increased from 1 to 7 mg-C/L, while the yield of I-THMs increased with increasing Br/Imolar ratio from 5:0 to 5:10. During the three processes mentioned above, similar I-THM formation results were also obtained in real water, which indicates that the excessive generation of I-THMs should be paid special attention during the disinfection of iodide-containing water.