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Shuchi Liao
Shuchi Liao

Graduate student
Brown University

I am a phd student at Brown university and I have been working on the interaction between PFAS and NAPL since 2019. My major interests on this topic are the effect of AFFF usage in fire fighting sites on NAPL distribution(solubilization and mobilization) as well as the effect of NAPL on PFAS transport and retention in unsaturated porous media.


PRESENTATION TITLE

Interactions of Aqueous Film Forming Foams with Non-aqueous Phase Liquids

The use of aqueous film forming foam not only resulted in persistent per- and polyfluoroalkyl substances (PFAS) contamination, also impacted the transport properties of co-contaminants, e.g. non-aqueous phase liquid (NAPL) and complicate their remediation. In this study, batch reactor and column experiments were conducted to investigate the potential for AFFF solutions to enhance the solubility and mobility of three representative non-aqueous phase liquid (NAPLs), JP-4 jet fuel, trichloroethene (TCE), and tetrachloroethene (PCE). For AFFF concentrations up to 5% wt. (50,000mg/L), aqueous solubilities of TCE and PCE increased by less than 50%, indicating the absence of micellar solubilization. However, NAPL-water interfacial tensions were reduced to less than 1.5 mN/m and partial mobilization of residual NAPL was observed in column experiments for PCE, TCE, and JP-4, with saturation reductions of 0.7 to 2 % in 20-30 mesh and 0.3% to 1.3% in 60-80 mesh Ottawa sand.


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