Salt Separation and Destruction of PFAS Utilizing Reverse Osmosis and Salt Separation
AssigneeRevive Environmental Technology, LLC
InventorsStephen H. Rosansky, Michael Miller, Patrick Norris, Darwin Argumedo, Douglas Hendry, Ian Haggerty, Keith Brown, Joshua James, Joseph Casciano, Slawomir Winecki, Vivek Lal, Tom McGuinness
Life of this patent
Estimating the term…
Abstract
Per- and polyfluoroalkyl substances (PFAS) are destroyed by oxidation in supercritical conditions. PFAS in water is concentrated in a reverse osmosis step and salt from the resulting solution is removed in supercritical conditions prior to destruction of PFAS in supercritical conditions.
Claims25
1-24. (canceled)
A method of salt separation from an aqueous PFAS solution comprising:
- providing an aqueous PFAS solution comprising a salt;
- preheating the aqueous solution to a temperature to form a supercritical heated composition;
- passing the supercritical heated composition into a transcritical hydrocyclone;
- a transcritical hydrocyclone, comprising:
- a conical chamber;
- a top outlet;
- an exit pipe;
- and
- a cone disposed within the conical chamber wherein the cone does not seal the top outlet or exit pipe, and a conical channel is formed between the inner wall of the transcritical hydrocyclone and an outer wall of the cone;
- cooling the outer wall of the transcritical hydrocyclone via a heat exchanger, causing an inner wall of the transcritical hydrocyclone to be cooler than the supercritical heated composition;
- passing the supercritical heated composition tangentially into the conical chamber through an inlet opening of the transcritical hydrocyclone;
- cooling the supercritical heated composition to form a layer of aqueous solution that is cooled to subcritical temperatures along the inner wall of the transcritical hydrocyclone;
- draining the layer of the aqueous solution cooled to subcritical temperatures downward through an exit pipe;
- and
- passing a portion of the supercritical heated composition in the conical chamber at supercritical temperatures out of the conical chamber through the top outlet.
A method of destroying PFAS in a SCWO system, wherein the SCWO system comprises a conduit from a source container to a heat exchanger and a conduit from the heat exchanger to a SCWO reactor;
- comprising:
- providing to the SCWO system an aqueous solution comprising water and PFAS;
- adding an oxidant to the aqueous solution;
- adding a fuel to the aqueous solution;
- passing the aqueous solution with added oxidant and fuel into the SCWO reactor and subjecting the aqueous solution to supercritical water oxidation in the SCWO reactor;
- and
- producing a clean effluent having a concentration of PFAS that is more than 100,000 times less than the first concentration of PFAS;
- and
- wherein, after start-up, no external heating is provided to the SCWO system.
A method of treating the effluent from a method of destroying PFAS in a SCWO reactor, comprising:
- passing an oxidant, PFAS, and water through a SCWO reactor to produce an effluent, and treating the effluent by one or more of the following:
- passing at least a portion of the effluent through activated carbon or ion exchange resin;
- passing at least a portion of the effluent into a mixing pipe where, optionally, the effluent is mixed with cooling water that optionally contains hydroxy salts;
- treatment by reverse osmosis;
- filtering or centrifuging the effluent to remove precipitates;
- wherein the effluent comprises a vapor stream comprising carbon dioxide and, optionally, oxygen gas and separating the vapor stream from a liquid stream.
Dependencies are inferred from the claim text.