Skip to main content
. 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 4.

Figure 4.

Breakthrough curves for PFOA transport under water-saturated and water-unsaturated conditions, with adsorption at air-water interfaces contributing to retention in the latter system. All simulations incorporate rate-limited solid-phase adsorption. The two simulations for the saturated-flow experiment represent solid-phase adsorption as nonlinear (NLS) and linear (Lin). For the unsaturated-flow experiments, 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. Case MPMT-2 incorporates rate-limited air-water interfacial adsorption, with the rate coefficient set equal to a value 10-times lower than the geometric mean of literature reported values. PFOA injection concentration is 10 μg/L; water saturation is 0.7.