不同消毒方式和工艺条件对碘代三卤甲烷生成的影响
Effect of Different Disinfection Methods and Process Conditions on Formation of I-THMs
李明阳1
作者信息
- 1. 沈阳化工研究院设计工程有限公司,辽宁沈阳 110021
- 折叠
摘要
水中碘代类消毒副产物(I-DBPs)是目前饮用水领域开始关注的新兴卤代消毒副产物种类之一,尽管碘代类消毒副产物的浓度维持在ng/L～ μg/L的数量级,但其三致性远大于溴代和氯代类消毒副产物.以实际水体——京密引水渠原水为重点研究对象,研究了不同消毒方式和工艺条件下碘代三卤甲烷(I-THMs)的生成特征,探索其生成机理.结果表明,I-THMs的生成受pH、消毒方式和I-浓度等因素的显著影响.所有消毒方式在I-浓度较高时(≥1 000 μg/L)均有助于CHI3的生成;I-浓度适量时(≤750 μg/L),氯胺消毒、氯消毒、HOBr和HOBr+(NH4)2SO4消毒主要生成的消毒副产物分别为CHI3、CHCl2I以及含Br的I-THMs.I-THMs的产量随pH的升高而增多,且氯胺消毒受pH的影响最明显,而含Br的I-THMs的产量随pH的升高而减少.HOBr消毒可有效减少I-THMs的生成,且不会导致Cl/Br-THMs的生成量明显增加,具有一定应用前景,值得深入研究.
Abstract
As one of the emerging halogenated disinfection by-products (DBPs) in water industry,iodinated DBPs was paid increasing attention recently.Despite of its low concentration in water,usually in the range from ng/L to μg/L,it posed higher risks for mutagenesis,carcinogenesis and teratogenesis than chlorinated and brominated DBPs.Characteristics of I-THMs formation by different disinfection methods and under different process conditions were studied in detail and the formation mechanism was investigated,using the raw water sample from Jingmi Diversion Canal.Results showed that the amount of I-THMs produced was dependent on pH value,type of disinfectant and iodine concentration.At high iodine concentration (usually ≥ 1 000 μg/L),CHI3 was the main variety of I-THMs for different disinfection methods including chloramination,chlorination,HOBr and HOBr+(NH4)2SO4 disinfections,while at low iodine concentration (usually ≤750 μg/L),the main varieties of I-THMs for chloramination was CHI3,for chlorination was CHCl2 I,and for HOBr and HOBr+ (NH4)2SO4 disinfections were I-THMs containing Br (CHBr2I and CHBrI2),respectively.Increase of pH value lead to production of more I-THMs,especially for chloramination,while production of I-THMs containing Br showed negative relationship with the increase of pH value.As the disinfectant of HOBr could reduce the formation of I-THMs effectively and might not increase the formation of Cl/Br-THMs obviously,it would have application prospect and need to be further studied.
关键词
碘代三卤甲烷/消毒副产物/消毒方式/京密引水渠Key words
I-THMs/disinfection by-products (DBPs)/disinfection method/Jingmi Diversion Canal引用本文复制引用
出版年
2018
国家科技期刊平台
NSTL
维普
万方数据