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IN SITU SEQUESTRATION OF PERFLUOROALKYL SUBSTANCES USING POLYMER-STABILIZED POWDERED ACTIVATED CARBON
Liu, C., J. Hatton, W.A. Arnold, M.F. Simcik, and K.D. Pennell.
Environmental Science & Technology [Published online 7 May 2020 prior to print]
The objective of this study was to evaluate the in situ delivery and sorptive capacity of an aqueous suspension containing powdered activated carbon (PAC) stabilized with polydiallyldimethylammonium chloride (polyDADMAC) to remove PFOA and PFOS from water. Batch studies demonstrated adsorption of PFOA and PFOS by polyDADMAC-stabilized PAC, yielding Freundlich adsorption coefficients of 156 and 629 L/g-n, respectively. In columns packed with 40-50 mesh Ottawa sand, injection of a 1000 mg/L PAC + 5000 mg/L polyDADMAC suspension created a sorptive region that increased PFOA and PFOS retention by three orders of magnitude relative to untreated control columns, consistent with the mass of retained PAC. Experiments conducted in a heterogeneous aquifer cell further demonstrated the potential for stabilized-PAC to be an effective in situ treatment option for PFAS-impacted groundwater.
Environmental Science & Technology [Published online 7 May 2020 prior to print]
The objective of this study was to evaluate the in situ delivery and sorptive capacity of an aqueous suspension containing powdered activated carbon (PAC) stabilized with polydiallyldimethylammonium chloride (polyDADMAC) to remove PFOA and PFOS from water. Batch studies demonstrated adsorption of PFOA and PFOS by polyDADMAC-stabilized PAC, yielding Freundlich adsorption coefficients of 156 and 629 L/g-n, respectively. In columns packed with 40-50 mesh Ottawa sand, injection of a 1000 mg/L PAC + 5000 mg/L polyDADMAC suspension created a sorptive region that increased PFOA and PFOS retention by three orders of magnitude relative to untreated control columns, consistent with the mass of retained PAC. Experiments conducted in a heterogeneous aquifer cell further demonstrated the potential for stabilized-PAC to be an effective in situ treatment option for PFAS-impacted groundwater.
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