Encapsulation of PFAS in Soil

This presentation describes the state-of-practice, and demonstrates typical results of the successful use of blended cement products for in-situ solidification/stabilization (S/S) of PFAS in contaminated soil. Typical analytical results indicate two to five orders of magnitude reduction between the concentration of PFAS in the untreated soil and the extraction fluid. The TCLP, SPLP and LEAF extraction methods are evaluated. The method describes how PFAS is encapsulated in a matrix formed by mixing the contaminated soil with a modified mineral binder. The solidified monolith can often be safely left in-situ. Results of a large scale, in-situ demonstration project are described. This method eliminates the need for off-site disposal of contaminated soil. This can be a stand-alone remediation option or it can be used in conjunction with other engineered controls to allow leaving the soils on-site. This constitutes 100% resource recovery.