A new PFAS treatment technology recently landed in North America, and it does more than just separate PFAS. CDM Smith has confirmed that the first North American field tests of EPOC Enviro’s Surface Active Foam Fractionation (SAFF®) mobile PFAS treatment system have successfully removed PFAS from groundwater and created a concentrate that can be cost-effectively managed.
After optimizing the unit for a field demonstration, CDM Smith engineers were able to separate and concentrate PFAS at a project site impacted by aqueous film forming foam (AFFF). The project team removed nearly all PFAS from both source area groundwater and effluent from an existing chlorinated volatile organic compound (CVOC) treatment system. In addition, the SAFF technology successfully concentrated PFAS, reducing the treated water volume by approximately 90,000 times.
“Treatment trains that first concentrate PFAS using a technology like SAFF are particularly promising for realizing complete and cost-effective destruction,” said Tamzen Macbeth, CDM Smith Environmental Engineer and Remediation Practice Leader.
CDM Smith has been working with EPOC Enviro for the past several years, preparing the technology for practical PFAS treatment. Following a promising round of testing at the bench-scale in CDM Smith’s Bellevue, Washington laboratory, the SAFF unit arrived in the U.S. via shipping container last fall. CDM Smith then transported the SAFF container to its first stop on a demonstration tour.
EPOC Enviro’s breakthrough SAFF system relies on a natural phenomenon called foam fractionation, wherein PFAS adhere to fine air bubbles. Using those bubbles, SAFF increases the air-water interface surface area, thereby separating the PFAS and collecting them in the form of concentrated foam.
SAFF is important for its ability to isolate PFAS from its source waters, but also for its efficiency. CDM Smith now has data confirming SAFF’s ability to isolate PFAS and collect them as foam for destruction. Using SAFF, the CDM Smith project team was able to separate on average 98 percent of PFAS from the source area groundwater and reduce the overall volume of treated water by 90,000 times. That volume reduction will make it easier to destroy the PFAS because all destructive treatment technologies are energy intensive
In addition to testing its general efficacy, the CDM Smith team was able to optimize SAFF for peak performance. The field test provided practical insights for future operations, including the optimization of chemical additives to yield the best removal efficiency.
Following the field test, scientists at CDM Smith’s Denver research laboratory prepared for destruction. Tamzen Macbeth and her team have already begun destroying the PFAS concentrate using electro-chemical oxidation (ECO). Connect with CDM Smith’s PFAS specialists for the latest information on how to employ SAFF to fight PFAS.
Source: CDM Smith