PFAS Treatment and remediation – soil

In current projects, Envytech is stabilizing PFAS-contaminated masses by using Rembind. The treatment takes place at an adjacent landfill where the masses are mixed with Rembind and are to be deposited after stabilization. All in accordance with the environmental authority guidelines. This alternative is economical in relation to other available treatment methods and in cases where the masses can be left on site, the savings become even more significant, as both transport and landfill costs are avoided.

We have visited the supplier Ziltek and educated ourselves on the possibilities with their product Rembind. We have taken part in the studies and tests performed as well as reference projects. We have also performed our own tests on PFAS-contaminated masses in our projects.

Rembind is a stabilizing agent consisting of activated carbon, aluminum hydroxide and other adsorbents. The product is a fine powder (200-400 μm) which binds chemical substances via ion and Van der Waals bonding as well as other physical and chemical bonding methods. Something that has proven to be very effective, as PFAS substances can occur in both positive or negative ionic form and sometimes both at the same time.

Performed tests show that PFAS-contaminated soil, mixed with Rembind, limits the leaching properties of PFAS substances by up to >99.9%. The tests have been performed in accordance with the methods US EPA method 1311 and US EPA method 1320 – the world’s most comprehensive and strictly approved lactate test for soil.

We have also performed our own tests on PFAS-contaminated soil to investigate the possibility of reducing lake properties. The results show that soil samples, which have not been stabilized with Rembind, leach significantly at L/S 2 regarding the PFAS substances; 6:2 FTS, PFBA, PFDA, PFHpA, PFHxA, PFHxS, PFNA, PFOA, PFOS and PFPeA. The total PFAS was measured at 1400 ng/l. In the analysis of leachate taken at L/S 8, continued leaching of PFAS PFDA, PFOS and PFPeA was observed. The total PFAS was measured at 290 ng/l. When analyzing leachate at L/S 2 for material stabilized with Rembind Plus, no levels of PFAS could be detected above the detection limits. When analyzing leachate at L/S 8, leaching of PFOS was measured at 0.77 ng/l. The total amount of PFAS thus amounted to 0.77 ng/l.

Click the links to read about our case studies:
Case study 1
Case study 2
Rembind PDF

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