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. Author manuscript; available in PMC: 2021 Jan 1.
Published in final edited form as: Water Res. 2019 Oct 15;168:115179. doi: 10.1016/j.watres.2019.115179

Figure 5.

Figure 5.

Breakthrough curves for PFOA transport under water-unsaturated conditions, with adsorption at air-water interfaces contributing to retention. All simulations incorporate rate-limited solid-phase adsorption. Case MPMT-0 incorporates local equilibrium (e.g., effectively “instantaneous”) air-water interfacial adsorption. Case MPMT-1 incorporates rate-limited air-water interfacial adsorption, with the rate coefficient set equal to the geometric mean of literature- reported values. A. PFOA injection concentration is 0.1 and 1 mg/L; water saturation is 0.7. B. PFOA injection concentration is 1 mg/L; water saturation is 0.8 and 0.87.