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MODIFIED CLAY AS AN EFFECTIVE SOIL AMENDMENT TO REDUCE LEACHING OF CATIONIC, ANIONIC AND NEUTRAL PFAS FROM CONTAMINATED SANDY SOILS
Wang, C., B. Yan, and J. Liu.
2019 Real Property Institute of Canada (RPIC) Federal Contaminated Sites Regional Workshop, 4-5 June, Halifax, Nova Scotia. 26 slides, 2019

Modified clays were evaluated as a soil amendment to reduce PFAS mobility and/or leachability in contaminated soils. PFAS-contaminated sandy soils were characterized for the presence of anionic, cationic and neutral PFAS. A modified batch test determined the effect of sorbent dosage, equilibration time, and potential microbial activities using heavily contaminated soil. A significant reduction (95~99%) of anionic PFAS from the soil leachate, including PFOS, PFHxS, and PFOA, was achieved in 1-3 days with a dosage as low as 0.5% wet weight. Reduction of several cationic and neutral PFAS was observed with a higher dose of clay. The presentation covers a comparative assessment conducted between the modified clay, natural clay, granular activated carbon, and biochar. Future testing involves assessing the modified clay's performance using a long-term unsaturated soil setup to simulate field conditions. http://rpic-ibic.ca/images/2019_FCSRW/presentations/Modified_Clay_as_an_Effective_Soil_Amendment_to_Reduce_Leaching_of_Cationic_Anionic_and_Neutral_PFAS_from_Contaminated_Sandy_Soils_.pdf Longer abstract available by clicking on Stream 4a at http://rpic-ibic.ca/en/events/2019-federal-contaminated-sites-fcs-regional-workshops/2019-rpic-fcs-regional-workshop/2019-rpic-fcs-regional-workshop-oral-abstracts/2019-rpic-fcs-regional-workshop-stream-4a-innovation-research-and-development-pfas-assessment



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