Emerging Contaminants Summit
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Emerging Contaminants Summit
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Paul Ruehl Paul Ruehl
Environmental Remediation Coordinator
LafargeHolcim

Paul Ruehl- Environmental Remediation Coordinator for LafargeHolcim BS- Chemistry Alma College 1977 MS- Chemistry University of Detroit 1985 Paul has 42 years as an environmental professional, 38 years in the cement industry; and 30 years as an adjunct university chemistry professor. He has been involved with solidification/stabilization (S/S) of contaminated sites in the US for more than 37 years. He presently works for LafargeHolcim Cement with responsibility throughout North America for the management of S/S projects. Paul has been involved with remediating more than 500 sites using cement products.



FLASH POSTER PRESENTATION

Encapsulation of PFAS from Landfill Leachate

Encapsulation of PFAS from Landfill Leachate-This presentation describes the state-of-practice, gives the results of the successful use of cement products for solidification/stabilization (S/S) of landfill leachate concentrate. One of the most expensive operating costs at a landfill is the management of leachate. The cost can be as low as $.03 to as much as $.20/gal. A typical landfill might have 10,000 gallons or more of leachate concentrate to manage. The concentrated leachate will nearly always have PFAS in significant amounts. LafargeHolcim has developed a method for specifically encapsulating PFAS from the concentrate, dramatically reducing the availability of PFAS to the environment. The method describes how such organic pollutants can be encapsulated in an inorganic matrix formed by mixing the contaminated aqueous liquid with a mineral binder. The inorganic matrix does not develop a high strength and can thus easily be easily excavated. The excavated material may be particularly useful as daily cover. Alternatively, the slurried concentrate can be sprayed onto the landfill 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 a daily cover instead of the usual six inches of “free” dirt from onsite. This increased capacity can significantly off-set the price of the binder and provide a permanent solution to recapturing PFAS contaminated leachate each day. This constitutes 100% resource recovery.


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