Encapsulation of PFAS from Landfill Leachate-This presentation describes the state-of-practice, and demonstrates typical results of the successful use of cement products for solidification/stabilization (S/S) of landfill leachate concentrate (concentrate). As much as one third of the operating costs at a landfill is the management of leachate. A typical landfill might have 10,000-100,000 gallons or more of leachate to manage. The concentrated leachate will nearly always have PFAS in significant amounts. LafargeHolcim has developed a method for encapsulating PFAS from the concentrate, dramatically reducing the availability of PFAS to the environment (patent pending). The method describes how PFAS is encapsulated in an inorganic matrix formed by mixing the contaminated aqueous liquid with a mineral binder. The slurried concentrate can be sprayed onto the landfill working face shortly after it has been treated. In this fashion, the landfill can increase its capacity and extend its useful life by using the treated leachate as an Alternate Daily Cover instead of the usual six inches of “free” dirt from onsite. This increased capacity can significantly offset the price of the binder and provide a permanent solution to recapturing PFAS contaminated leachate each day. This method eliminates off-site disposal costs for leachate and the need to recirculate leachate into the landfill. This constitutes 100% resource recovery.
