Methods and Systems of PFAS Destruction using UV Irradiation at 222 Nanometers

A system of PFAS destruction comprising:

• a pretreatment reactor comprising:
• a pre-treatment vessel configured to contain an aqueous solution containing PFAS at elevated pressure and comprising a heating element to heat the aqueous solution contained therein;
• and
• sources of persulfate and acid or base configured to deliver persulfate and acid or base to the aqueous solution before or within the pre-treatment vessel;
• a photoreactor downstream of the pretreatment reactor, the photoreactor comprising:
• a reactor vessel configured to receive an aqueous solution;
• a plurality of ultraviolet light sources configured to deliver light at 222 nm to the aqueous solution including PFAS in the reactor vessel;
• and
• a source of a sulfite salt configured to deliver the sulfite salt to the aqueous solution before or within the reactor vessel.