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 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,Key Laboratory of Yangtze Water Environment,Ministry of Education,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China [3]Department of Safety,Health and Environmental Engineering,“National”Kaohsiung University of Science and Technology,Kaohsiung 824,Chinese Taipei [4]College of Environmental and Chemical Engineering,Shanghai University of Electric Power,Shanghai 200090,China

出　　处：《Journal of Environmental Sciences》2022年第7期285-294,共10页环境科学学报（英文版）

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

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.

关 键 词：Inorganic chloramine Iodinated trihalomethanes(I-THMs) CHLORINATION Monochloramination Dichloramination Bromide to iodide ratio 

分 类 号：TU991.2[建筑科学—市政工程]