PFAS in Biosolids Under a Land Application Scenario: Biotic Weather, Leaching, and Transport
There are many sources of per- and polyfluoroalkyl substances (PFAS) to water resource recovery facilities. Wastewater treatment and biosolids stabilization processes do not effectively degrade PFAS, and notable concentrations can be found in biosolids. Therefore, there are questions regarding the fate and transport of PFAS that originate in land-applied biosolids. This webcast focused on Assessing Per- and Polyfluoroalkyl Substance Release from Finished Biosolids (project 5042). Dr. Erica McKenzie described the ongoing efforts to understand what factors influence PFAS partitioning between biosolids and surrounding water. Specifically, how the research team has been conducting laboratory experiments to understand how PFAS partitioning changes as the biosolids are biologically weathered; additionally, transformation of precursor PFAS are observed during this process. In the second part of the presentation, Dr. Charles Schaefer presented findings from the completed microcosm study that assessed vertical transport of PFAS through a soil column, simulating land application of biosolids.