The objective of this study was to evaluate a cross-section of full-scale on-site landfill treatment systems to measure changes in PFAS concentrations. Leachate samples were collected before and after treatment from 15 facilities and were evaluated for 26 PFAS, including 11 perfluoroalkyl carboxylic acids (PFCAs), 7 perfluoroalkyl sulfonic acids (PFSAs), and 8 perfluoroalkyl acid precursors (PFAA-precursors). The transformation of precursors was evaluated by the total oxidizable precursor (TOP) assay. Results showed no obvious reductions in total measured PFAS (∑26PFAS) for on-site treatment systems including ponds, aeration tanks, powdered activated carbon (PAC), and sand filtration. Among evaluated on-site treatment systems, only systems fitted with reverse osmosis (RO) showed significant reductions (98-99 %) of ∑26PFAS in the permeate. Results from the TOP assay showed that untargeted PFAA-precursors converted into targeted short-chain PFCAs increasing ∑26PFAS in oxidized samples by 30 %, on average.
Overall, the results of this study confirm the efficacy of RO systems and suggest the presence of additional precursors beyond those measured in this study. SCS is part of the technical advisory group for this collaboration of the schools in Florida and the EPA. SCS’s Liquid Management Practice is helping the group with on-site work at landfills.
Chen Y, Zhang H, Liu Y, Bowden JA, Tolaymat TM, Townsend TG, Solo-Gabriele HM.
Waste Manag. 2022 Sep 6;153:110-120. doi: 10.1016/j.wasman.2022.08.024. Online ahead of print.
PMID: 36084369
The following universities with EPA are affiliated with the study:
SCS Engineers is hosting a panel on proposed PFAS regulations as EPA continues to work on its goal of adding PFOA and PFOS as hazardous constituents under CERCLA – aka Superfund. EPA is also considering adding certain PFAS as hazardous constituents under Appendix VIII of the Resource Conservation and Recovery Act or RCRA, giving EPA authority to require RCRA corrective action for PFAS at RCRA sites. With data for about 14 PFAS constituents, including some of the newer ones commonly known as GenX, and based on toxicity data, the EPA supports the development of standards for risk-based concentration levels and risk screening levels for ingesting PFAS.
In July’s client webinar, our panelists aim to bring clarity and advice to those operating landfills that may become subject to regulations. The free webinar features a panel of speakers clarifying the recent plans, headlines and health advisories surrounding PFAS, as well as sharing some promising leachate treatment options. SCS’s engineers, scientists and landfill operations experts will speak during the forum and answer your questions. They are also available for follow-up after the 2 p.m. July 21 webinar.
Landfill operators who manage waste streams, leachate and sludges possibly laden with PFAS can attend this event and learn about the latest regulatory changes and proposals surrounding PFAS.
Reprint from a Recycling Today article by Managing Editor Bob Gaetjens.
As the EPA considers regulating PFAS, SCS Engineers helps bring clarity and advice to those operating landfills that may become subject to regulations.
Per- and polyfluoroalkyl substances (PFAS) are under the sharp gaze of the U.S. Environmental Protection Agency (EPA), which plans to determine how toxic the substance is.
There now is data for about 14 PFAS constituents, including some of the newer ones commonly known as GenX. Based on toxicity data, the EPA supports the development of standards for risk-based concentration levels and risk screening levels for ingesting PFAS. The state of Maine announced earlier this year a ban on PFAS in landfill leachate.
The EPA is considering whether to propose that perfluorooctanoic acid (PFOA) and perfluorooctanicsulfonic acid (PFOS) be classified as hazardous PFAS constituents under Appendix VIII of the Resource Conservation and Recovery Act (RCRA), giving the federal agency the authority to require corrective action for PFAS and RCRA sites.
It is with this background that SCS Engineers is hosting a webinar featuring a panel of speakers clarifying the recent plans, headlines and health advisories surrounding PFAS, as well as sharing some promising leachate treatment options. SCS’s engineers, scientists and landfill operations experts will be featured during the forum and can be available for follow-up after the 2 p.m. July 21 webinar.
Landfill operators who manage waste streams, leachate and sludges possibly laden with PFAS can attend this event and learn about the latest regulatory changes and proposals surrounding PFAS.
Certificates of attendance are available for attendees who registered on Zoom and attended the live session.
