| 含碘水折点加氯过程中消毒副产物的生成影响机制 |
| |
| 引用本文： | 张肸同,徐斌,张天阳,刘志,朱静萍,高炜,沈玉琼,芮旻.含碘水折点加氯过程中消毒副产物的生成影响机制[J].净水技术,2020,39(2):81-90. |
| |
| 作者姓名： | 张肸同 徐斌 张天阳 刘志 朱静萍 高炜 沈玉琼 芮旻 |
| |
| 作者单位： | 同济大学污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海 200092;同济大学污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海 200092;上海污染控制与生态安全研究院,上海 200092;上海城投水务〈集团〉有限公司制水分公司,上海 200080;上海市政工程设计研究总院〈集团〉有限公司,上海 200092 |
| |
| 基金项目： | 上海市青年科技英才"扬帆计划"项目;水体污染控制与治理科技重大专项 |
| |
| 摘 要： | 文中重点考察含碘水折点加氯过程中消毒副产物(DBPs)的生成特性,包括常规含碳类DBPs(C-DBPs)和新型含氮类DBPs(N-DBPs)。旨在通过探索不同碘离子浓度(I^-)、溴碘摩尔比(Br^-/I^-)、天然有机物(NOM)浓度以及pH条件下C-DBPs和N-DBPs的生成趋势,寻求一种最佳的氯投加方式,从而减少消毒副产物的生成。试验研究结果表明,当水中只存在I^-时,沿折点加氯曲线生成的C-DBPs和N-DBPs主要是三氯甲烷(TCM)和二氯乙腈(DCAN),且随着加氯量的增加,TCM和DCAN生成浓度均逐渐增加,折点以后浓度增加更明显。当加氯量一定时,随着I^-浓度的升高,TCM和DCAN生成量反而略有下降。而当水中同时含有Br^-、I^-时,折点加氯过程中会额外产生多种具有更高细胞毒性的溴代C-DBPs二溴一氯甲烷(DBCM)、一氯二溴甲烷(CDBM)和三溴甲烷(TBM)]和溴代N-DBPs一溴一氯乙腈(BCAN)和二溴乙腈(DBAN)]。随着Br^-/I^-增加,TBM和DBAN浓度逐渐升高并成为主要DBPs。随着NOM浓度升高,TCM和DCAN生成量增大并逐渐饱和。pH不仅会影响折点加氯过程中氯形态变化,还会影响DBPs的生成,其中pH值=6.0时TCM生成量最少,pH值=8.0时DCAN生成量最少。
|
| 关 键 词： | 折点加氯 碘离子(I^-) 溴离子(Br^-) 含碳消毒副产物(C-DBPs) 含氮消毒副产物(N-DBPs) |
Influencing Mechanism of DBPs Formation during Breakpoint Chlorination Process for Iodide-Containing Water Treatment |
| |
| ZHANG Xitong,XU Bin,ZHANG Tianyang,LIU Zhi,ZHU Jingping,GAO Wei,SHEN Yuqiong,RUI.Influencing Mechanism of DBPs Formation during Breakpoint Chlorination Process for Iodide-Containing Water Treatment[J].Water Purifcation Technology,2020,39(2):81-90. |
| |
| Authors: | ZHANG Xitong XU Bin ZHANG Tianyang LIU Zhi ZHU Jingping GAO Wei SHEN Yuqiong RUI |
| |
| Affiliation: | (State Key Laboratory of Pollution Control and Resource Reuse,Key Laboratory of Yangtze Aquatic Environment,Ministry of Educa⁃tion,Tongji University,Shanghai 200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China;Water Treatment Branch Company,Shanghai City Investmen WaterCo.,Ltd.,Shanghai 200080,China;Shang Hai Municipal Engineering Design InstituteCo.,Ltd.,Shanghai 200092,China) |
| |
| Abstract: | The study mainly investigated the formation of disinfection by-products(DBPs), including regular carbonaceous DBPs(C-DBPs) and emerging nitrogenous DBPs(N-DBPs), during break-point chlorination of iodide-containing water. Impact factors including I^-, natural organic matter(NOM) concentration and pH value as well as Br^-/I^-molar ratio were systematically investigated in the work. The objective was to find an optimal chlorination method to reduce the production of disinfection by-products. The experimental results showed that trichloromethane(TCM) and dichloroacetonitrile(DCAN) were major DBPs alongside breakpoint curves in iodide-containing water. The concentration of C-DBPs and N-DBPs increased with the increase of chlorination dosage, which was more remarkable in the post-breakpoint. However, with the increase of I^-concentration, the formation of TCM and DCAN decreased slightly. In addition, when the source water contained both Br^- and I^-, with the increase of Br^-/I^-ratio, the concentrations of tribromomethane(TBM) and dibromoacetonitrile(DBAN) with higher cytotoxicity increased and became the dominant substances gradually. With the increase of NOM concentration, TCM and DCAN products increased and became saturated gradually. Meanwhile, pH value would not only affect morphological changes of chlorine in the process of chlorination, but also affect the generation of DBPs. When pH value was 6.0, the concentration of TCM was the lowest, and when pH value was 8.0, DCAN was the lowest. |
| |
| Keywords: | break-point chlorination iodide ion(I^-) bromide ion(Br^-) carbonaceous disinfection by-products(C-DBPs) nitrogenous disinfection by-products(N-DBPs) |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
