Methods and systems for pfas destruction using photochemical/electrochemical reduction of reagents

A method of destroying PFAS comprising:

• continuously flowing an aqueous solution through one or more photochemical reactors, the aqueous solution comprising:
• one or more PFAS, the PFAS having an initial concentration of carbon fluorine bonds;
• and
• a photosensitizer comprising a sulfite salt at a concentration between a minimum of 0.1 mM and a maximum of no greater than 10 times the concentration of carbon fluorine bonds;
• and
• a pH of 9 or higher;
• and
• exposing the continuously flowing aqueous solution to UV light from one or more UV light sources in the one or more photochemical reactors, the UV light sources producing UV light with a maximum light intensity at 200 nm to 250 nm.

A continuous flow UV photoreactor comprising:

• a reactor vessel comprising:
• a tube comprising a proximal end, an opposing distal end, a proximal portion and a distal portion, wherein the proximal portion is relatively closer to the proximal end and the distal portion is relatively closer to the distal end;
• a fluid inlet at the proximal end;
• a fluid outlet at the distal end;
• a photochemical chamber within the tube between the proximal and distal ends;
• one or more elongated UV lamps in the photochemical chamber;
• one or more cathodes within the photochemical chamber;
• and
• one or more anodes distal to the one or more cathodes, wherein the one or more anodes are electrically connected to the one or more cathodes.