US 2026/0092213 A1 · DESTRUCTION OF PFAS IN SOIL

Abstract

A method and system for the destruction of per- and polyfluoroalkyl substances (PFAS) in soil is disclosed. The method includes introducing a soil composition including PFAS into a sealed reactor vessel. An oxidant may be introduced into the reactor vessel, and the soil composition may be dosed with the oxidant to form a dosed soil composition, where the dosed soil composition is a soil slurry that includes between 20 wt % and 50 wt % solids. An alkaline additive may be introduced into the reactor vessel. The reactor vessel may then be pressurized to a pressure at or above 2,000 psi and heated to a temperature at or above 350° C. The dosed soil composition and alkaline additive may be maintained under the reactor pressure and reactor temperature for a reaction period sufficient to destruct more than 90 weight percent of the PFAS present in the dosed soil composition.

Claims36

Dependent claims

A method for the destruction of per- and polyfluoroalkyl substances (PFAS) in soil, the method comprising:

(a) providing a soil composition comprising PFAS;
(b) introducing the soil composition into a sealed reactor vessel;
(c) introducing into the reactor vessel an oxidant selected from the group consisting of hydrogen peroxide and compressed air;
(d) dosing the soil composition with the oxidant, wherein the dosing results in formation of a dosed soil composition;
(e) introducing into the reactor vessel an alkaline additive selected from the group consisting of sodium hydroxide and calcium hydroxide;
(f) pressurizing the reactor vessel to a reactor pressure at or above 2000 psi;
(g) heating the reactor vessel to a reactor temperature at or above 350° C.;
and
(h) maintaining the dosed soil composition and the alkaline additive at the reactor pressure and the reactor temperature for a reaction period, wherein more than 90 wt % of the PFAS present in the dosed soil composition are destructed.

6 more elements

A system for the destruction of per- and polyfluoroalkyl substances (PFAS) in soil, the system comprising:

(a) a sealed reactor vessel configured to contain a soil composition comprising PFAS;
(b) an oxidant delivery assembly configured to introduce into the reactor vessel an oxidant, wherein the oxidant is selected from the group consisting of hydrogen peroxide and compressed air;
(c) an additive delivery assembly configured to introduce into the reactor vessel an alkaline additive, wherein the alkaline additive is selected from the group consisting of sodium hydroxide and calcium hydroxide;
(d) a pressurization assembly comprising a pressurization valve and a pressure gauge, wherein the pressurization assembly is configured to pressurize the reactor vessel to a reactor pressure at or above 2000 psi;
(e) a heating assembly configured to heat the reactor vessel to a reactor temperature at or above 350° C.;
(f) a thermocouple assembly configured to monitor temperature inside the reactor vessel;
and
(g) a venting assembly comprising a vent valve connected to the reactor vessel,
(i) wherein the sealed reactor is configured to maintain the soil composition, the oxidant, and the alkaline additive under the reactor pressure and the reactor temperature for a reaction period, and
(ii) wherein the sealed reactor is configured to destroy more than 90 wt % the PFAS present in the soil composition.

7 more elements

Dependencies are inferred from the claim text.

Destruction of pfas in soil

Life of this patent

Destruction of pfas in soil

Life of this patent

Abstract

Claims36