US 12,281,030 B2
On-site destruction of recalcitrant perfluoroalkyl substances by molecular sieves
Viktor Cybulskis, North Syracuse, NY (US)
Assigned to SYRACUSE UNIVERSITY, Syracuse, NY (US)
Filed by Viktor Cybulskis, North Syracuse, NY (US)
Filed on Mar. 1, 2024, as Appl. No. 18/593,151.
Application 18/593,151 is a division of application No. 17/529,738, filed on Nov. 18, 2021, granted, now 11,945,732.
Claims priority of provisional application 63/115,105, filed on Nov. 18, 2020.
Prior Publication US 2024/0199446 A1, Jun. 20, 2024
Int. Cl. C02F 1/28 (2023.01); C02F 1/72 (2023.01); C02F 101/30 (2006.01); C02F 103/06 (2006.01)
CPC C02F 1/28 (2013.01) [C02F 1/725 (2013.01); C02F 2101/30 (2013.01); C02F 2103/06 (2013.01); C02F 2201/78 (2013.01); C02F 2301/066 (2013.01); C02F 2303/14 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of destroying recalcitrant perfluoroalkyl substances, comprising the steps of:
feeding an aqueous stream containing PFAS to a first vessel containing an adsorption bed formed from a porous, hydrophobic, hydrothermally stable molecular sieve;
draining the aqueous stream from the first vessel;
introducing compressed air into the first vessel;
raising a temperature of the adsorption bed to between 80 and 120 degrees Celsius until the adsorption bed is dry;
increasing the temperature of the adsorption bed to above 150 degrees Celsius;
introducing an amount of ozone into the first vessel;
providing any off-gases from the first vessel to a second vessel having a catalytic bed formed from a zeolite-supported CaO catalyst;
oxidizing any off-gases from the second vessel with a catalytic oxidizer coupled to the second vessel and having a metal-oxide supported noble catalyst operating at a temperature of between 200 and 350 degrees Celsius.