Zhang Chaojie, Yan Hong, Li Fei, Zhou Qi
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China,
Environ Sci Pollut Res Int. 2015 Feb;22(3):1804-11. doi: 10.1007/s11356-013-2044-8. Epub 2013 Aug 10.
Perfluorinated acids (PFAs) have drawn much attention due to their environmental persistence, ubiquitous existence, and bioaccumulation potential. The discharge of wastewater effluent from municipal wastewater treatment plants (WWTPs) is a significant source of PFAs to the environment. In this study, wastewater and sludge samples were collected from two WWTPs in Shanghai, China, to investigate the contamination level and fate of PFAs in different stages of processing. The total concentrations of PFAs (∑PFAs) in influent from plants A and B were 2,452 and 292 ng L(-1), respectively. Perfluoropentanoic acid (1,520 ± 80 ng L(-1) in plant A and 89.2 ± 12.1 ng L(-1) in plant B) was the predominant PFA in influent waters, followed by perfluorooctanoic acid. The concentration of ∑PFAs ranged from 75.0 to 126.0 ng g(-1) dry weight in sludge samples from plant B, with perfluorooctanesulfonic acid as the predominant contaminant. The concentrations and fate of PFAs in different WWTPs vary. The ∑PFAs entering plant A decreased significantly in the final effluent of activated sludge process, while that in plant B increased significantly in the final effluent of sequencing batch reactor system. The concentration changes could be due to the sorption onto sludge, or the degradation of PFAs precursors.
全氟辛酸（PFAs）因其在环境中的持久性、广泛存在性和生物累积潜力而备受关注。城市污水处理厂（WWTPs）排放的废水是环境中PFAs的重要来源。本研究从中国上海的两家污水处理厂采集了废水和污泥样本，以调查PFAs在不同处理阶段的污染水平和去向。A厂和B厂进水的PFAs总浓度（∑PFAs）分别为2452和292 ng L(-1)。全氟戊酸（A厂为1520±80 ng L(-1)，B厂为89.2±12.1 ng L(-1)）是进水水域中主要的PFAs，其次是全氟辛酸。B厂污泥样本中∑PFAs的浓度范围为75.0至126.0 ng g(-1)干重，以全氟辛烷磺酸为主要污染物。不同污水处理厂中PFAs的浓度和去向各不相同。进入A厂的∑PFAs在活性污泥工艺的最终出水中显著降低，而进入B厂的∑PFAs在序批式反应器系统的最终出水中显著增加。浓度变化可能是由于污泥吸附，或PFAs前体的降解。
