ARFF NEWS (CONT)
non-toxic byproducts under atmospheric temperature and pressure. It has a small footprint and is easily mobilized using a trailer. The PFASigator can be direct-connected to a fire truck for recirculating the decon solution between the PFASigator and the truck to simultaneously destroy PFAS while desorbing PFAS from the truck’s internal surfaces (Figure 2).
to form a recirculation loop. Approximately 120 gallons of water plus surfactant were recirculated between one AFFF tank and the PFASigator at 25 gallons per minute (gpm), with a temperature raised to 40-50°C. An onboard ion-selective electrode (ISE) on the PFASigator allowed us to monitor fluoride production in real-time as a direct indicator of PFAS destruction progress during
recirculation. Water samples were collected from the recirculation loop and sent to an analytical laboratory for PFAS and other chemical analyses. The test was conducted for the primary foam tank and the associated piping and then repeated for the secondary foam tank and the associated
Figure 2 – Illustration of
recirculating water between PFASigator (left) and firetruck.
piping. Upon completion of the PFAS destruction phase, the recirculated rinse water was treated with a final polishing step using a small vessel containing reversible sorbent media that captured any trace amounts of PFAS remaining in the rinse water. Demonstration Results and Conclusions
The Oshkosh TA-1500 (Year 1993 model, 31’ long, 12’ tall, 10’ height) used for the demonstration had decades of service history. The truck contained two AFFF sub-tanks, both of which were coated with fiberglass, a material with strong PFAS adsorption. The PFASigator was connected directly with each foam tank and the associated piping
ARFF NEWS | MAY- JUNE 2025 13
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