You are here:
PFAS Occurrence Modeling, Research, and Treatment Data Analysis and Modeling – An EPA Research Overview
Citation:
Cadwallader, A., G. Abulikemu, S. Smith, D. Knappe, R. Summers, J. Burkhardt, L. Haupert, B. Datsov, T. Sanan, E. Kleiner, B. Gray, D. Lytle, G. Sorial, E. Stebel, C. Gastaldo, B. Crone, E. Womack, AND R. Taylor. PFAS Occurrence Modeling, Research, and Treatment Data Analysis and Modeling – An EPA Research Overview. American Water Works Association Water Quality Technology Conference, Cincinnati, OH, November 13 - 17, 2022.
Impact/Purpose:
PFAS removal from drinking water sources is an important current events issue. EPA is conducting a myriad of efforts to address PFAS in drinking water, on the regulatory, treatment, and cost pathways. Attendees seeking to learn more about how EPA is engaging on this topic and about the removal of PFAS from drinking water will find this session worthwhile.
Description:
Within the EPA PFAS Strategic Roadmap, ORD, OW, and other partners are working more closely together than ever before to reach common goals. The overall objective of this session is to share some of the breadth and depth of ongoing work. Descriptions of the six presentations included in this special session are: 1) A national model for four per- and polyfluoroalkyl substances (PFAS) was developed and informed by national and state datasets. Model development, model structure, and the current estimates of national occurrence will be discussed. 2) USEPA research to systematically evaluate GAC adsorption kinetics and capacity of PFAS at various drinking water relevant conditions, providing the basis for customizing and optimizing GAC treatment units for specific conditions and treatment goals. 3) USEPA research investigated anion exchange for PFAS removal and inorganic anion impacts, including kinetics, isotherms, and columns (with and without NOM) and leading to validation and application of a newly developed ion exchange column model. 4) PFAS breakthrough data were collected with rapid small-scale column tests and compared to pilot-scale data to develop validated scale-up approaches. Factors controlling GAC and anion exchange use rates will be presented based on scaled up RSSCT data. 5) The impact of influent (TOC, PFAS and other compounds concentrations and pH), effluent and operating (EBCT, lead lag, media type) conditions on the full- and pilot-scale removal (> 50 breakthrough curves) of several PFASs will be summarized. 6) Media capacity estimates were developed based on breakthrough data from more than fifty full and pilot-scale systems. Opportunities and challenges of using models to predict performance based on system configuration and water quality are discussed.
URLs/Downloads:
GRANULAR ACTIVATED CARBON (GAC) BATCH ADSORPTION OF PER-AND-POLYFLUOROALKYL SUBSTANCES (PFAS) FROM DRINKING WATER.PDF (PDF, NA pp, 1083.46 KB, about PDF)MODELING ADSORPTION OF PFAS IN FULL AND PILOT-SCALE GAC AND ION EXCHANGE SYSTEMS.PDF (PDF, NA pp, 4511.492 KB, about PDF)
ANION EXCHANGE FOR PFAS REMOVAL & INORGANIC ANION IMPACTS.PDF (PDF, NA pp, 3729.262 KB, about PDF)