Process for removal of PFAS from water
AssigneeChromafora AB
InventorsMartin Kullberg, Karin Löfstrand, Gaston Lavén
Life of this patent
Estimating the term…
Abstract
A method for removing PFAS from a PFAS-containing aqueous phase, comprising adding to said aqueous phase a surfactant composition comprising at least one cationic surfactant, to allow the surfactant to form micelles in said aqueous phase, and bringing said micelle-containing aqueous phase in contact with an ultrafiltration membrane under pressure, to obtain a permeate flow aqueous phase having a reduced concentration of PFAS.
Claims17
A method for removing PFAS from a PFAS-containing aqueous phase, said PFAS comprising at least one compound selected from perfluorobutanoic acid, perfluoropentanoic acid, perfluorohexanoic acid, perfluoroheptanoic acid, perfluorooctanoic acid, perfluorononanoic acid, perfluorodecanoic acid, perfluorobutanesulphonic acid, perfluorohexanesulphonic acid, perfluorooctanesulphonic acid, and 6:2 fluorotelomer sulfonate, said method comprising:
- (i) adding to a volume of said PFAS-containing aqueous phase a surfactant composition comprising at least one cationic surfactant, to allow the surfactant to form micelles, said micelles capturing PFAS present in said PFAS-containing aqueous phase, and
- (ii) bringing said volume of PFAS-containing aqueous phase, containing said formed micelles carrying captured PFAS, into contact with an ultrafiltration membrane under pressure, to obtain a permeate flow aqueous phase having a reduced concentration of PFAS, wherein said at least one compound has a concentration reduced by at least 97% in the obtained permeate flow aqueous phase, and a retentate aqueous phase having a higher concentration of PFAS, wherein the retentate aqueous phase has a volume of less than 15% of the volume of the PFAS-containing aqueous phase in (i).
Dependencies are inferred from the claim text.