This study probed the interactions of hydrated electrons (eaq-) and perfluorooctanoic acid (PFOA)-laden ion exchange (IX) resins in the presence of natural organic matter (NOM). PFOA and Suwannee River NOM-loaded resins were prepared by adsorbing PFOA in simulated natural water with weak base anion (WBA) resins (IRA67). The adsorbed NOM was much more abundant than co-sorbed PFOA, indicating the resin saturation is governed by the NOM adosrption. A following UV/SO32- treatment (pH 10.0 and DO free) could generate eaq- to effectively degrade sorbed and aqueous PFOA. Furthermore, cyclic adsorption - UV/SO32- treatment tests demonstrate that the PFOA sorbed on the WBA resins could be mostly degraded within six cycles. However, eaq- could not effectively decompose co-sorbed NOM, resulting in a gradual decrease in the recovered PFOA adsorption capability with the cycle number. This study highlights that eaq- can decompose PFOA sorbed on the WBA resins in the presence of NOM. The UV/SO32- process, if jcombined with other strategies for mitigating co-sorbed NOM, can enable a promising on-site resin regeneration process with PFOA degradation, while producing a small volume of easily managed regenerant waste.

Hydrated electron decomposition of PFOA  sorbed on ion exchange resins in the presence of natural organic matter

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