Ion exchange membrane composition and methods for the concentration of perfluoroalkyl substances

A method of concentrating perfluoroalkyl substances (PFAS) from a wastewater containing a concentration of PFAS, comprising:

• passing the wastewater containing the PFAS over an ion exchange resin to uptake the PFAS onto the ion exchange resin;
• regenerating the ion exchange resin by passing a regeneration stream comprising an alcohol solution over the ion exchange resin to remove the PFAS and produce a waste stream comprising the alcohol solution containing the PFAS;
• flowing the waste stream through a dilution compartment of an electrodialysis device;
• flowing a treatment stream through a concentration compartment of the electrodialysis device, the treatment stream consisting of a water miscible organic solvent;
• and
• applying a voltage across first and second electrodes of the electrodialysis device through an anion exchange membrane including a microporous substrate comprising polyethylene having a porosity of between 25% and 45% with an average pore size of between 50 nm and 10 um positioned between the dilution compartment and the concentration compartment to cause migration of the PFAS across the anion exchange membrane from the dilution compartment to the concentration compartment, and form a dilute stream comprising the alcohol solution being substantially free of the PFAS and a concentrate stream.