Methods and systems for continuous pfas destruction

A method of lowering a concentration of PFAS in a solution comprising:

• exposing a treatment solution to a UV light source in a continuous reactor, the continuous reactor comprising one or more lamps, an inlet, an outlet, and one or more mixing baffles, the treatment solution comprising a PFAS, iodide and sulfite, and has a pH of about 8 or more;
• and
• flowing the treatment solution through the continuous reactor from the inlet to the outlet at a flow rate of equal to or greater than 5 gallons per minute while exposing the treatment solution to the UV light;
• wherein exposing the treatment solution to UV light in the continuous reactor results in partially or fully defluorinating about 80% or more of the PFAS in the treatment solution.