PerfluorAd is a plant-based, weak oleic acid that has a strong affinity to PFAS, forming small particles that are easily filtered.
Following the 3X Rinse, TRS initiated the PerfluorAd® method for the remainder of the clean-out, which includes generating and heating a PerfluorAd® solution and circulating it through the storage tank and foam dispersion network for about 90 minutes, followed with potable water for 60 minutes. TRS completed four flushes and treated the accumulated rinsate using PerfluorAd, filtered the generated flocs, and then polished the rinsate with liquid-phase granular activated carbon (LGAC). TRS completed the clean-out in four business days.
While the 3X Rinse did remove some PFOA, a fair amount remained. After applying PerfluorAd, the analytical results showed more than 99.9 percent removal of PFOA.
Figure 1 illustrates the PFOA reductions from baseline concentrations for 3x Rinse, the PerfluorAd® process, and the final rinsate after treatment with PerfluorAd. While the results for PerfluorAd were actually non-detect, we assume PFOA concentrations at half the detection limit.