In-situ remediation of PFASs based on sorption methods (StopPFAS)

Poly- and perfluoroalkyl substances (PFASs) are highly fluorinated compounds, many of which are widespread, extremely persistent in the environment, bioaccumulate, and are potentially carcinogenic and toxic. Because conventional in-situ remediation methods for soil and groundwater are inefficient for most PFASs, there are currently no established methods for PFAS in-situ remediation. Instead, long-term pumping with treatment of contaminated water is common. Robust and efficient methods to remediate PFASs in situ and stop PFAS plumes in groundwater from reaching drinking water resources are critically needed.

The aim of this project is to test and develop in-situ methods to efficiently sorb and immobilize all relevant PFASs in plumes in groundwater originating from hot spot areas. We will investigate the potential of several sorption methods including PlumeStop ®, RemBind ®, and various clay materials. We will also investigate how to best apply the sorbents at field sites, such as by direct injection or in permeable reactive barriers, and how these zones of sorbed PFASs can be regenerated to ensure a robust long-term solution. In the first 2 years we will focus on laboratory experiments to systematically test the methods under varied, controlled conditions, relevant for Swedish soils and groundwaters. Based on our results we will develop reactive transport modelling tools and perform modelling feasibility studies on how to implement the method at field sites, both in general and for one test site used in the project. In year 3 we will conduct a pilot-scale field test using PlumeStop ® as a sorbent. All results will be summarized in a guideline document for designing a successful remediation scheme using sorbents in “real world situations”.

Contact: Fritjof Fagerlund