市政污水处理系统中不同工艺段多氟/全氟烷基化合物(PFASs)的赋存、转化和去除

Review on the occurrence,transformation and removal of per-and polyfluoroalkyl substances(PFASs)in different process segments of sewage wastewater treatment systems

全氟烷基化合物(per-and polyfluoroalkyl substances,PFASs)是一类由有机氟疏水烷基链和亲水端基组成的人工合成化合物.由于它们在工业生产和生活中的广泛使用,在过去的几十年中,它们在全球污水处理厂中均被检出.目前,关于市政污水处理系统中PFASs的研究主要包括赋存水平、转化过程和去除技术三方面.本文系统概括了多种PFASs在市政污水处理系统不同工艺段中的赋存、转化和去除情况,并对不同工艺段PFASs的赋存和转化规律进行了深入讨论.分析了PFASs的结构特征对于其在市政污水处理系统不同工艺段赋存、转化和去除的影响机制.基于此,提出了目前研究所面临的问题和未来研究需要重点考虑的方向.同时,总结归纳了不同水处理技术对PFASs的去除效率,以及现有技术所存在的问题、面临的挑战以及未来的发展前景,以期为后续研究提供参考.

Per-and polyfluoroalkyl substances(PFASs)are a class of synthetic compounds composed of organofluorine hydrophobic alkyl chain and a hydrophilic ionic functional group.Due to their widespread use in industry production and our lives,PFASs have been detected in sewage treatment plants around the world.At present,the research on PFASs in municipal sewage plants mainly focuses occurrence concentrations,transformation processes and removal technologies.In this study,we systematically summarize the fate,transformation and removal of various PFASs municipal sewage treatment plants,and the PFASs occurrence and transformation in different process segments were also discussed.The influence from the PFASs structure characteristics on their occurrence,transformation and removal in sewage treatment plants were also analyzed.Based on these,we summarized the major problems in current studies and the further studying directions were also proposed for next studies.At the same time,the PFASs removal efficiency in different water treatment technologies were summarized,as well as the problems,challenges and the future development prospects of the existing technologies.We expected this study could provide a reference for the subsequent research.