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先进的氧化过程可能会将地下水中的未知PFAS转化为已知的产品

Mahmut S Ersan¹, Bo Wang², Michael S Wong²

¹Department of Civil Engineering, University of North Dakota, Grand Forks, ND, 58202, USA; School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-5306, USA; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, USA.

|December 4, 2023

概括

先进的氧化过程 (AOPs) 可以去除一些Per-和多基物质 (PFAS),但可以将未知的PFAS转化为可检测的物质,从而增加总PFAS水平. 对于AOP治疗的评估,建议进行可吸收有机 (AOF) 分析.

科学领域:

环境化学环境化学
水处理技术水处理技术
分析化学分析化学

背景情况:

和多醇基物质 (PFAS) 是水生环境中的持久污染物.
由于未分析的PFAS,先前关于通过先进氧化过程 (AOP) 降解PFAS的研究可能存在缺陷.
现实世界中的水矩阵含有未被检测或未知的PFAS,可能会干扰处理评估.

研究的目的:

在试点系统中,选各种AOP和光催化剂去除PFAS.
评估在AOP处理过程中未被检测/未知的PFAS转化为已知的化合物.
评估这些转换对饮用水源中PFAS总度的影响.

主要方法:

包括UV,UV+H2O2,O3/H2O2和UV光催化剂在内的AOP的试点规模测试.
使用商业和新型光催化剂,如TiO2和化 (BN).
在处理前后的真实地下水样本中分析目标和非目标PFAS化合物.

主要成果:

AOPs证明了特定目标PFAS化合物 (例如PFDA,PFNA,PFOA,PFOS) 的去除.
在高剂量条件下,AOP将未检测/未知的长链PFAS转化为短链PFAS.
这种转变导致总PFAS (PFAS) 度显著增加,从95%到340%不等.

结论:

AOP显示了PFAS去除的潜力,但可以通过转化未知的化合物来无意中增加总PFAS.
未来的PFAS处理研究必须考虑非目标PFAS及其转化产品.
在AOP治疗前后进行吸附性有机 (AOF) 分析是评估整体有效性和风险的有希望的方法.

关键词:

先进的氧化过程具有先进的氧化过程.地下水的地下水.没有检测到/未知更长链的 perfluoroalkyl 和 polyfluoroalkyl 物质

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