Craig Klevan, Oren Van Allen, Kelly Mukai, Andre Gomes, Shana Xia, Seth Caines, Matthew J. Woodcock and Kurt D. Pennell
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引用次数: 0
摘要
由于全氟烷基和多氟烷基物质(PFAS)倾向于在空气-水界面积聚,泡沫分馏作为一种经济有效的处理PFAS影响的水的方法受到了关注。虽然泡沫分馏对长链PFAS是有效的,但短链PFAS的表面活性较低,即使在延长处理时间后仍能留在溶液中。本研究的目的是评估六种阳离子表面活性剂通过泡沫分馏从地下水中去除长链和短链PFAS的能力。十六烷基三甲基溴化铵(CTAB)在空气-水界面积聚最多,随后在泡沫分馏系统中对PFAS浓度的4个数量级范围以及4种不同的CTAB质量递送率进行了评估。对于两种受水膜形成泡沫(AFFF)影响的天然地下水,PFAS总浓度在短短15分钟内从~ 15,000 ng L−1降至低于8 ng L−1的检测限。这些发现表明,在泡沫分馏系统中加入对空气-水界面具有强亲和力的CTAB,可以快速去除合成和天然地下水中的长链和短链PFAS。
Removal of long- and short-chain PFAS from groundwater by foam fractionation
Due to the tendency for per- and polyfluoroalkyl substances (PFAS) to accumulate at the air–water interface, foam fractionation has gained attention as a cost-effective approach to treat PFAS-impacted water. Although foam fractionation is effective for long-chain length PFAS, short-chain PFAS are less surface active and can remain in solution even after extended treatment times. The objective of this study was to evaluate the ability of six cationic surfactants to remove both long- and short-chain length PFAS from groundwater by foam fractionation. Cetyltrimethylammonium bromide (CTAB) accumulated the most at the air–water interface and was subsequently evaluated in a foam fractionation system over a 4 order of magnitude range of PFAS concentrations, as well as 4 different CTAB mass delivery rates. For two natural groundwaters impacted by aqueous film forming foam (AFFF), total PFAS concentrations were reduced from ∼15 000 ng L−1 to less than the detection limit of 8 ng L−1 in as short as 15 minutes. These findings demonstrate that the addition of CTAB, which exhibits a strong affinity for the air–water interface, to foam fractionation systems achieves rapid removal of both long- and short-chain PFAS from synthetic and natural groundwaters.
期刊介绍:
Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.