Granted Patent B2

US 12,545,601 · App. 19/015,951 · Granted Feb 10, 2026

Inventors: Zekun Liu (Brooklyn Park, MN); Joseph Reuel Levine Tirado (Minneapolis, MN); Sonja Elise Moons (Minneapolis, MN); John Wilfrid Brockgreitens (Minneapolis, MN); Elvin Haffez Hossen (Richmond, TX); Terry Lee Potts (Woodbury, MN); Terrance P. Smith (Woodbury, MN)

Assignee: Claros Technologies Inc.

C02F1/325C02F1/008C02F1/42C02F1/441C02F2101/36C02F2201/32C02F2209/06C02F2303/18

Abstract

Claims (29)

1 . A method of PFAS destruction comprising:

a. providing water including PFAS and fresh reactants comprising photosensitizer, sulfite salt and base;

b. combining the water including PFAS with the fresh reactants to form an initial treatment solution having a pH of about 10 or more;

c. irradiating the initial treatment solution with UV light in a photoreactor to destroy a portion of the PFAS and form treatment effluent;

d. passing the treatment effluent through an ion selective membrane to form a permeate and a reject solution, the reject solution comprising recovered reactants;

e. combining the reject solution with additional water including PFAS to form a subsequent treatment solution;

f. irradiating the subsequent treatment solution with UV light in the photoreactor to destroy a portion of the PFAS and forming treatment effluent;

g. repeating steps d-f to recycle the recovered reactants one or more additional times.

2 . The method of claim 1 further comprising, after step g,

h. purging the recovered reactants.

3 . The method of claim 2 wherein purging the recycled reactants comprising purging treatment effluent.

4 . The method of claim 2 wherein purging the recycled reactants comprises purging reject solution.

5 . The method of claim 2 wherein purging comprises discharging without recycling of the recovered reactants for PFAS destruction.

6 . The method of claim 2 wherein purging comprises post treatment processing.

7 . The method of claim 1 further comprising adding one or more fresh reactants to the subsequent treatment solution prior to step f.

8 . The method of claim 7 wherein the fresh reactant comprises sulfite salt.

9 . The method of claim 7 wherein the fresh reactant comprises base.

10 . The method of claim 1 wherein the photosensitizer comprises a halide salt.

11 . The method of claim 10 wherein the halide salt comprises iodide.

12 . A method of PFAS destruction comprising:

a. providing water including PFAS and fresh reactants comprising iodide salt, sulfite salt and base;

b. combining the water including PFAS with the fresh reactants to form an initial treatment solution having a pH of about 12 or more;

c. irradiating the initial treatment solution with UV light in a photoreactor to destroy a portion of the PFAS and form treatment effluent;

d. passing the treatment effluent through an ion selective membrane to form a permeate and a reject solution, the reject solution comprising recovered reactants;

e. combining the reject solution additional water including PFAS to form a subsequent treatment solution;

f. irradiating the subsequent treatment solution with UV light in the photoreactor to destroy a portion of the PFAS and forming treatment effluent;

g. repeating steps d-f to recycle the recovered reactants one or more additional times; and then

h. after step g, purging the treatment effluent or the reject solution.

13 . The method of claim 12 further comprising adding one or more fresh reactants to the subsequent treatment solution prior to step f.

Assignments (1)

Continuity (5)

References Cited (400)