朱晓燕,叶婷,夏彭斌,李婷婷,贾欣,孙洪杰,洪华嫦.臭氧与氯联合消毒对钱塘江水源水DBPs形成及溴取代的影响[J].环境科学学报,2019,39(4):1226-1233
臭氧与氯联合消毒对钱塘江水源水DBPs形成及溴取代的影响
- Formation of disinfection by-products and the bromine incorporation upon ozone-chlorination of Qiantang River water
- 基金项目：浙江省基础公益研究计划项目（No.LGF18H260005）
- 朱晓燕
- 浙江师范大学地理与环境科学学院, 金华 321004
- 叶婷
- 浙江师范大学地理与环境科学学院, 金华 321004
- 夏彭斌
- 浙江师范大学地理与环境科学学院, 金华 321004
- 李婷婷
- 浙江师范大学地理与环境科学学院, 金华 321004
- 贾欣
- 浙江师范大学地理与环境科学学院, 金华 321004
- 孙洪杰
- 浙江师范大学地理与环境科学学院, 金华 321004
- 洪华嫦
- 浙江师范大学地理与环境科学学院, 金华 321004
- 摘要：本文研究了在pH 6~8、反应时间2~72 h、反应温度10~30℃条件下，钱塘江水源水在臭氧-氯消毒联合作用下，三卤甲烷（THMs）、二卤乙酸（DHAAs）、三卤乙酸（THAAs）、二卤乙腈（HANs）、三卤硝基甲烷（THNMs）等5类消毒副产物（DBPs）的形成和溴取代特征.结果显示，臭氧-氯消毒下DBPs的形成与氯消毒有较多相似之处：①大部分DBPs形成量均随着温度的升高、时间的延长而增加，相应的溴取代因子（BSFs）则随着时间的延长、温度的上升而呈下降趋势；②氯代DHANs倾向于在酸性条件下形成多，而溴代DHANs则倾向于在碱性条件下形成多；③不管是氯消毒还是臭氧-氯消毒，也不管是哪种消毒条件，5类DBPs的BSF值顺序均为BSFHNMs > BSFDHANs > BSFTHAAs > BSFTHMs ≈ BSFDHAAs.但与氯消毒不同的是，臭氧-氯消毒下THMs、DHAAs、THAAs、HANs的形成产量更低，而THNMs的产量则更高；而且与氯消毒相比，臭氧-氯消毒普遍增加了DBPs的溴取代程度，也改变了溴离子在不同DBPs之间的分配，即减少了THMs、DHAAs、THAAs、DHANs对溴的利用率，但大幅增加了HNMs的溴利用率.鉴于溴代HNMs的极高毒性，因此对于钱塘江水源水，臭氧-氯消毒要注意HNMs带来的健康风险.
- Abstract：Present study investigated the formation of disinfection by-products (DBPs), i.e. trihalomethanes (THMs), dihaloacetic acids (DHAAs), trihaloacetic acids (THAAs), dihaloacetonitriles (DHANs) and trihalonitromethanes (THNMs) upon ozone-chlorination of water collected from Qiantang River under the following conditions:pH6~8, reaction time 2~72 h and reaction temperature 10~30℃. Results show that DBPs formation in ozone-chlorination and chlorination share some similarity:①most DBPs formation increased with the increase of temperature and reaction time, yet the corresponding bromine substitution factor (BSFs) showed an opposite trend;②Chlorinated HANs tend to form more in acidic condition, while brominated HANs tend to accumulate in alkaline condition; ③the BSFs values were always ranked as BSFTHNMs > BSFDHANs > BSFTHAAs > BSFTHMs ≈ BSFDHAAs regardless of the different disinfection mode (chlorine or ozone-chlorine) and conditions. However, there are also several different aspects:the yields of THMs, DHAAs, THAAs and HANs in ozone-chlorination were lower yet THNMs yields were higher in chlorination; Moreover, comparing with chlorination, ozone-chlorination increased bromine incorporation during DBPs formation, and changed the bromine distribution in different DBPs species, i.e. the bromine utilization factor (BUF) for THMs, DHANs, DHAAs and THAAs decreased but BUF for THNMs greatly increased during ozone-chlorination. Considering the high toxicity of brominated THNMs, health risk derived from Br-THNMs should be paid attention.
