Factors affecting the formation of trihalomethanes in the presence of bromide during chloramination  

作　　者：Yong-ji ZHANG Ling-ling ZHOU Guo ZENG Zheng-guo SONG Gui-bai LI 

机构地区：[1]Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China [2]State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China [3]School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2010年第8期606-612,共7页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China (No. 50878164);the Key Special Program on the S & T for the Pollution Control and Treatment of Water Bodies (No. 2008ZX07-422-005);the Research Fund for the Doctoral Program of Higher Education of China (No. 200802471037);the Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Edu-cation, Tongji University (No. YRWEY1001), China

摘　　要：The effects of the concentration of dissolved total organic carbon (TOC), the TOC/Br- ratio, bromide ion levels, the chlorine to ammonia-N ratio (Cl:N), the monochloramine dose and the chlorine dose on the formation of trihalomethanes (THMs) (including chloroform, bromodichloromethane, chlorodibromomethane, and bromoform) from chlorination were investigated using aqueous humic acid (HA) solutions. The profile of the chloramine decay was also studied under various bromide ion concentrations. Monochloramine decayed in the presence of organic material and bromide ions. The percentage of chloroform and brominated THMs varied according to the TOC/Br- ratio. Total THMs (TTHMs) formation increased from 112 to 190 μg/L with the increase concentrations of bromide ions from 0.67 to 6.72 mg/L, but the chlorine-substituted THMs were replaced by bromine-substituted THMs. A strong linear correlation was obtained between the monochloramine dose and the formation of THMs for Cl:N ratios of 3:1 and 5:1. These ratios had a distinct effect on the formation of chloroform but had little impact on the formation of bromodichloromethane or chlorodibromomethane. The presence of bromide ions increased the rate of monochloramine decay.The effects of the concentration of dissolved total organic carbon （TOC）, the TOC/Br ratio, bromide ion levels, the chlorine to ammonia-N ratio （CI：N）, the monochloratuine dose and the chlorine dose on the formation oftrihalomethanes （THMs） （including chloroform, bromodichloromethane, chlorodibrotuotuethane, and bromoform） from chlorination were investigated using aqueous humic acid （HA） solutions. The profile of the chloramine decay was also studied under various bromide ion concentrations. Monochloramine decayed in the presence of organic material and bromide ions. The percentage of chloroform and brominated THMs varied according to the TOC/Br^- ratio. Total THMs （TTHMs） formation increased from 112 to 190 μg/L with the increase concentrations of bromide ions from 0.67 to 6.72 mg/L, but the chlorine-substituted THMs were replaced by bromine-substituted THMs. A strong linear correlation was obtained between the monochloramine dose and the formation of THMs for CI：N ratios of 3：1 and 5：1. These ratios had a distinct effect on the formation of chloroform but had little impact on the formation of bromodichloromethane or chlorodibromomethane. The presence of bromide ions increased the rate of monochloramine decay.

关 键 词：Trihalomethanes (THMs) Humic acid (HA) BROMIDE MONOCHLORAMINE 

分 类 号：TU991.2[建筑科学—市政工程] X5[环境科学与工程—环境工程]