Concentrating Per- and Polyfluoroalkyl Substances (PFAS) in Municipal Solid Waste Landfill Leachate Using Foam Separation.,Environmental Science & Technology

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Concentrating Per- and Polyfluoroalkyl Substances (PFAS) in Municipal Solid Waste Landfill Leachate Using Foam Separation.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.est.0c01266
Nicole M Robey ₁ , Bianca F da Silva ₂ , Michael D Annable ₁ , Timothy G Townsend ₁ , John A Bowden _{1,

2}

Affiliation

Large volumes of per- and polyfluoroalkyl substances (PFAS)-contaminated wastewaters, such as municipal solid waste landfill leachates, pose a challenge for PFAS treatment technologies in practice today. In this study, the surfactant properties of PFAS were exploited to concentrate the compounds in foam produced via the bubble aeration of landfill leachate. The effectiveness of the foaming technique for concentrating PFAS varied by compound, with a mean removal percentage (the percent difference between PFAS in leachate before and after foam removal) of 69% and a median removal percentage of 92% among the 10 replicate foaming experiments. This technique appears to be similarly effective at sequestering sulfonates and carboxylate PFAS compounds and is less effective at concentrating the smallest and largest PFAS molecules. The results of this study suggest that for the pretreatment or preconcentration of landfill leachates, foaming to sequester PFAS may provide a practical approach that could be strategically coupled to high-energy PFAS-destructive treatment technologies. The process described herein is simple and could feasibly be applied at a relatively low cost at most landfills, where leachate aeration is already commonplace.

中文翻译：

使用泡沫分离法浓缩城市固体垃圾填埋场渗滤液中的全氟和多氟烷基物质（PFAS）。

如今，大量被全氟烷基物质和多氟烷基物质（PFAS）污染的废水，例如城市固体垃圾填埋场渗滤液，对PFAS处理技术提出了挑战。在这项研究中，利用PFAS的表面活性剂特性将化合物浓缩到通过垃圾渗滤液的气泡曝气产生的泡沫中。发泡技术浓缩PFAS的效果因化合物而异，在10次重复发泡实验中，平均去除百分比（去除泡沫前后的渗滤液中PFAS之间的百分比差异）为69％，中值去除百分比为92％。该技术似乎在螯合磺酸盐和羧酸盐PFAS化合物方面同样有效，而在浓缩最小和最大的PFAS分子方面效果较差。这项研究的结果表明，对于垃圾渗滤液的预处理或预浓缩而言，起泡沫至螯合PFAS可能提供一种实用的方法，该策略可以与高能PFAS破坏性处理技术进行战略性耦合。本文所述的过程是简单的，并且可以在大多数渗滤液已经很普遍的垃圾填埋场以相对较低的成本进行应用。

更新日期：2020-10-06

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