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Six Pilot-Scale Studies Evaluating the In-Situ Treatment of PFAS in Groundwater

Highlights of this free webinar:

  • The results from the adsorption-based permeable reactive zones (PRZ) indicated that attenuation of the PFAS was occurring.
  • Colloidal activated carbon (CAC)-based PRZ showed the best performance with all the PFAS analyzed being removed to below their respective detection limits (10 ng/L).
  • The powdered activated carbon (PAC)-based PRZ showed variable treatment.
  • The biochar and ion exchange resins (IER) PRZs initially attenuated the PFAS but then had breakthrough of the C4 PFAS compounds prior to the 6-month post-injection sampling event, with the remainder of the PFAS compounds breaking through prior to the 9-month post injection sampling event.

In this webinar we were pleased to have as a special guest speaker Rick McGregor, President of InSitu Remediation Services Ltd. His presentation discussed six pilot-scale studies evaluating the in-situ treatment of PFAS in groundwater. PFAS are an emerging suite of compounds that have gathered wide-spread attention but have few remedial options. Research and limited field studies suggest that some reagents have promise for the removal of PFAS from groundwater. Six reagents were chosen for pilot testing including hydrogen peroxide, unactivated sodium persulfate, CAC, PAC, biochar and IER to determine if the reagents could be effective at reducing/removing the PFAS. Various PFAS were detected within the pre-treatment groundwater including PFDS, PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFOS and PFNA with concentrations ranging up to 18,000 ng/L for PFPeA. Six pilot-scale permeable reactive zones (PRZs) were created in a shallow, unconfined aquifer situated in a slightly saline, sulfate-iron reducing environment. The groundwater was also impacted with gasoline-range petroleum hydrocarbons along with various additives including MTBE and TBA.

View this free webinar