常规处理工艺对饮用水中全氟化合物的去除效果研究

Removal efficiency of perfluorinated compounds in drinking water by conventional treatment process

目的本研究通过对枯水期和丰水期常规处理工艺下水源水和出厂水中全氟化合物(perfluorinated compounds,PFCs)浓度的比较,评价常规处理工艺对水中全氟化合物的去除效果。方法采用固相萃取-超高效液相色谱串联质谱的方法,对水源水和出厂水中11种中、短碳链的PFCs进行检测,分析其检出率、浓度以及常规处理工艺的去除效果。结果结果显示,在水源水和出厂水中普遍有PFCs的检出,检出率分别为1.67%~73.3%和0%~63.3%。常规处理工艺对水中ΣPFCs的平均去除率为14.4%,3种化合物出现了去除率负增长的情况。与枯水期相比,丰水期PFCs的检出率及浓度更高,常规处理工艺在丰水期对PFCs的去除效果优于枯水期。结论常规处理工艺对饮用水中PFCs的去除效果有限,部分水厂出现了出厂水中PFCs浓度高于水源水的情况,必要时应考虑采用更有效的水处理方式降低饮用水中PFCs的浓度。

Objective To evaluate the effect of conventional treatment process on the removal efficiency of perfluorinated compounds(PFCs)in water by comparing the concentrations of PFCs between source water and finished water after conventional treatment in both dry season and wet season.Methods Solid-phase extraction-ultra-performance liquid chromatography/tandem mass spectrometry SPE-UPLC-MS/MS was used to measure 11 kinds of short-and medium-chain PFCs in source water and finished water,and analysis was performed in terms of detection rate,concentration level,and the removal effect of conventional treatment process.Results The result showed that PFCs were detected in both source water and finished water,with a detection rate of 1.67%-73.3%and 0%-63.3%,respectively.The mean removal rate ofΣPFCs in water by conventional treatment process was 14.4%,and the removal rate of three compounds showed a negative increase.The detection rate and concentration level of PFCs in wet season were higher than those in dry season,and the removal effect of conventional treatment process on PFCs in wet season was better than that in dry season.Conclusion Conventional treatment process has a limited removal effect on PFCs in drinking water,and in some water plants,the concentration of PFCs in finished water is higher than that in source water.If necessary,more effective water treatment method should be considered to reduce the concentration level of PFCs in drinking water.