Application of rapid small-scale column tests for treatment of perfluoroalkyl acids using anion-exchange resins and granular activated carbon in groundwater with elevated organic carbon

Charles E. Schaefer, Dung Nguyen, Veronika M. Culina, Jennifer Guelfo, Naveen Kumar

Research output: Contribution to journalArticlepeer-review

Abstract

Rapid small-scale column tests (RSSCTs) are often employed in laboratory testing to determine contaminant treatment effectiveness by anion-exchange resins (AERs) or granular activated carbons (GACs) in a short timeframe compared to pilot testing. RSSCTs are performed by reducing the AER or GAC particle size via grinding, allowing for increased mass transfer and water throughput. However, the scaling factors between ground and unground resins for perfluoroalkyl acids (PFAAs), specifically for waters with elevated natural organic carbon levels, remain uncertain. Bench-scale column experiments were performed to evaluate the applicability of employing RSSCTs for removal of PFAAs from groundwater with elevated naturally occurring organic carbon using ground and unground AERs and GACs. For both the AERs and the GAC, PFAA migration through the columns was well-described by the Thomas model. A constant diffusivity model was appropriate for describing transport. For GAC and one of the AERs tested, the inclusion of near-surface adsorption was accounted for by scaling the equilibrium sorption capacity to r-0.5.

Original languageEnglish
Pages (from-to)16832-16837
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume59
Issue number38
DOIs
StatePublished - Sep 23 2020

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