Tempe PFAS Wellhead Treatment Evaluation Study
Project Overview
In 2019, Carollo performed a study for the City of Tempe to evaluate potential PFAS treatment alternatives for three of the City’s wells and proposed a preliminary strategy to blend or treat PFOA and PFOS from those wells. Carollo also evaluated the level and extent of PFOA and PFOS contamination in the vicinity of target wells to establish approximate boundaries for the contamination plume.
The project included raw water sampling, plume investigation, treatment alternative evaluation, conceptual design, engineering cost estimates, etc. To better quantify the O&M and life-cycle costs, Carollo collaborated with Arizona State University (ASU) to perform bench-scale RSSCT testing.
With funding and in-kind contributions from City of Tempe, ASU, and Carollo, a five-month demonstration-scale test was completed at the City’s well adjacent to ASU. The demonstration testing effort provided benchmark data for commercially available treatment as well as novel technologies. It offered valuable insights on PFAS treatability that resulted in specific guidance toward full system design of GAC and IX resin systems.
