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Pfas Removal From Fire Extinguishing Foam

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Posted 15 February 2017 - 03:01 AM



In order for our plant to comply with existing and upcoming regulations regarding Perfluorinated alkylated substances (PFAS) in our waste water, we have to consider some kind of separation technology at our waste water treatment plant (WWTP). We have PFAS in our fire extinguishing foam which is only used occasionally. 


Today, we have: API, sand filters (SF), Biobeds and DAF (to remove debris from biobed). In general a quite standard water treatment. I'm considering using carbon filtration technology as post filtration adsorption as it's been proven to clean most of the PFAS substances (however, the shorter chains might get through). RO seems to be able to purify all chainlengths of the PFAS but it's too expensive. The waste water contains oil and other chemical components. 


Where would be the best place to place the filter? Could the PFAS destroy the environment in the biobeds or are they stable enough to go through without interfering with the bacteria? Where can I find information on how to design and dimension the GAC-filtration unit? 


All the best,


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