Pilot testing is the most reliable method for predicting how a PFAS treatment technology will perform under actual site conditions before committing capital to full-scale infrastructure. While bench-scale and RSSCT data provide useful guidance, a properly designed pilot test conducted at your facility generates site-specific performance data that reduces technology selection risk and supports regulatory acceptance of the chosen approach.
Designing a Meaningful PFAS Pilot Test
A PFAS pilot test should be designed to answer specific performance questions: What is the media-specific BV to breakthrough for your water chemistry? How does seasonal variation in source water quality affect media life? What is the achievable effluent quality at the design EBCT? Define these questions before the pilot begins and ensure the test protocol collects the data needed to answer them.
Pilot duration should be sufficient to observe at least 70–80% of the predicted media life based on RSSCT projections. For systems with low PFAS influent concentrations, this may require a 6–12 month pilot to reach meaningful breakthrough data. Budget for the full pilot duration in project planning; truncated pilots that end before breakthrough is approached provide insufficient performance data for design confidence.
Regulatory and Documentation Considerations
Notify your state primacy agency before initiating a pilot test, particularly if the pilot involves treating a portion of the system’s production capacity. Some states require formal approval for pilot installations at regulated water systems. Early regulatory engagement allows you to align pilot monitoring protocols with data requirements for treatment technique approval or variance application.
Maintain a comprehensive pilot test log documenting influent and effluent sampling results, flow rates, EBCT, cumulative bed volumes, media change-out events, and any operational anomalies. This log becomes the primary evidentiary document for full-scale technology selection and may be required as a submission to the regulatory agency when seeking approval for permanent treatment installation.
The cost of a thorough pilot test is a small fraction of full-scale capital investment. Water systems that skip or shorten pilot testing to accelerate project timelines frequently encounter performance shortfalls after full-scale deployment that are far more costly to remediate than the pilot savings realized.