Systems and methods of regenerating activated carbon
AssigneeRevive Environmental Technology, LLC
InventorsRyan R. James, Kavitha Dasu, Dinusha Siriwardena, Franco Pala, Ramona Darlington Iery
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Abstract
The invention provides methods for regenerating activated carbon that have been used in absorbing per- and polyfluoroalkyl substances (PFAS) in aqueous solution. In these methods, the activated carbon is treated with a solution of base in alcohol, which has been found to impart superior properties to the activated carbon.
Claims20
A method of regenerating activated carbon contaminated by polyfluoroalkyl substances (PFAS) and/or perfluorooctane sulfonate (PFOS), comprising:
- providing activated carbon having adsorbed polyfluoroalkyl substances (PFAS) and/or perfluorooctane sulfonate (PFOS);
- contacting the activated carbon in a solution that comprises at least 50 mass % alcohol and at least 0.2 mass % of a base;
- and
- separating the activated carbon from the solution.
A method of regenerating activated carbon contaminated by polyfluoroalkyl substances (PFAS) and/or perfluorooctane sulfonate (PFOS), comprising:
- providing activated carbon having adsorbed polyfluoroalkyl substances (PFAS) and/or perfluorooctane sulfonate (PFOS);
- contacting the activated carbon in a solution that comprises at least 50 mass % alcohol and at least 0.5 mass % of a base;
- and
- separating the activated carbon from the solution.
A system for regenerating activated carbon, comprising:
- a vessel comprising activated carbon having an inlet and an outlet, and the activated carbon having adsorbed polyfluoroalkyl substances (PFAS);
- and
- a distillation column connected to the outlet of the vessel;
- and
- wherein an alcohol solution comprising at least 0.2 mass % base is present in the system.
Dependencies are inferred from the claim text.