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. He was joined by Maureen Dooley, Director of Strategic Projects at REGENESIS, who discussed in situ treatment of PFAS using colloidal activated carbon to eliminate PFAS risk at a low cost.
Highlights of this free webinar:
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The results from the adsorption-based permeable reactive zones (PRZ) indicated that attenuation of the PFAS was occurring.
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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).
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The powdered activated carbon (PAC)-based PRZ showed variable treatment.
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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.
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.
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About the Presenters:
Rick McGregor
President, InSitu Remediation Services Ltd
Rick McGregor is the President of InSitu Remediation Services Ltd and has over 26 years’ experience in groundwater and soil assessment and remediation. Rick has worked in over 30 countries and has authored numerous papers on groundwater assessment and remediation. Rick holds a M.Sc. from the University of Waterloo in hydrogeology and geochemistry and is a Certified Ground Water Professional in Canada and the United States.
Maureen Dooley
Director of Strategic Projects, REGENESIS
Maureen Dooley has over twenty five years experience in the environmental industry including project management, research and development, senior technical oversight, remedial design and laboratory management. Ms. Dooley’s current position is the Director of Strategic Projects for REGENESIS. In her current role at REGENESIS, she provides technical leadership for complex soil and groundwater remediation projects throughout North America, as well as remediation design, strategy, and business development in the northeastern United States and eastern Canada. As part of her responsibilities at REGENESIS she has reviewed hundreds of potential projects and provided recommendations for remediation. In addition, she has completed numerous treatability studies designed to evaluate the remediation of a wide range of contaminants, including chlorinated solvents, petroleum hydrocarbons, and emerging contaminants like PFAS.