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IN SITU TREATMENT OF PFAS-IMPACTED GROUNDWATER USING COLLOIDAL ACTIVATED CARBON
McGregor, R.
Remediation Journal 28(3):33-41(2018)

Colloidal activated carbon injections were implemented at a site in Canada where PFOA and PFOS were detected in groundwater at concentrations up to 3,260 ng/L and 1,450 ng/L, respectively. The shallow silty-sand aquifer was anaerobic with an average linear groundwater velocity of ~2.6 m/d. The colloidal activated carbon was applied using direct-push technology, and PFOA and PFOS concentrations < 30 ng/L were subsequently measured in groundwater samples over an 18-month period. With the exception of perfluoroundecanoic acid (20 ng/L) and perfluorooctanesulfonate (40 ng/L), all PFASs analyzed were below their respective method detection limits in all postinjection samples after 18 months. As measured in cores up to 5 m from the injection point, the colloidal activated carbon was distributed successfully within the target zone of the impacted aquifer.



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