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This article published in Frontiers in Environmental Chemistry reviews a case study of the effect of heterogeneity on the distribution of colloidal activated carbon (CAC) and subsequent treatment of PFAS at a site with a multiple aquifer system. The site’s geology varied from a silty sand to sand to fractured bedrock with all three units being impacted by PFAS and BTEX.

Highlights of the results documented in this research article:

  • PFAS in groundwater were treated effectively to below their respective reporting limits for the duration of the 1-year test in both the silty sand and sand aquifers
  • PFAS in the fractured rock aquifer showed a different treatment profile with longer carbon chained PFAS being attenuated preferentially compared to the shorter carbon chained PFAS
  • Analysis of the unconsolidated aquifer materials determined that direct push injection of the CAC was effective at delivering the CAC to the target injection zones with post-injection total organic carbon (TOC) concentrations increasing by up to three orders of magnitude compared to pre-injection TOC concentrations

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About the Environmental Consultant/Author:

Rick McGregor is the President of InSitu Remediation Services Ltd 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.

About InSitu Remediation Services Ltd:

Rick McGregor is the President of InSitu Remediation Services Ltd One of Canada’s most experienced remediation companies, InSitu Remediation Services Ltd. (IRSL) has designed, implemented, and maintained soil and groundwater remediation programs in diverse geological environments in North, Central, and South America, Europe and the Middle East.