Longevity of PFAS Immobilization in Soil by RemBind Documented in Two Newly Published Studies



AquaBlok Ltd. is pleased to announce that a ground-breaking study has recently been published in the highly regarded Science of the Total Environment in regarding the durability of RemBind® as a remediation solution for soils contaminated with Per- and Polyfluoroalkyl Substances (PFAS).

In the peer-reviewed study by researchers at the University of Adelaide, two soils from PFAS-contaminated sites in Australia were treated with 5% RemBind®, a powdered reagent that binds up and neutralizes PFAS in soil.

Using US EPA Methods 1313, 1314 and 1320, untreated and treated soils were subjected to multiple rounds of leaching to simulate years of rainfall under a wide range of environmental conditions.

Results showed that RemBind® was highly effective in significantly reducing the leachable concentrations of all PFASs. For a highly contaminated clay soil, concentrations of leachable PFASs were reduced by up to 99% after remediation. Reductions in a sandy soil were 100%, with no detectable concentrations of PFAS found after remediation.

The authors concluded that this remediation appears robust against changes in pH (2−12), extreme temperatures (5 to 113 degrees Fahrenheit), high ionic strength and high concentrations of organic matter in the environment. As a result, it was concluded that remediation of soils with RemBind® are likely to remain stable for extended periods under a wide range of environmental variables encountered at most site conditions.

The study recommended that these simulations should be validated under field conditions over at least a few years” in order to provide a high level of confidence to site owners and regulatory authorities. This has been achieved in a separate U.S. based field study where PFAS leaching from RemBind® treated soil was monitored using US EPA methods, and no PFAS leaching was detected after more than 22 months.

This independent validation of the long-term stability of RemBind® provides added confidence to regulators and site owners that PFAS contaminants can be managed on-site with adequate risk reduction to provide a long-term and highly cost effective solution for PFAS contaminated soils. This approach has been implemented widely on a full-scale basis in Australia and Europe and it has provided a viable alternative for expensive thermal and soil washing technologies, especially for large volumes of PFAS-impacted soils.