Sorbents having high volumetric iodine and molasses values for removal of pfas from fluids and methods of making and using the same
AssigneeCalgon Carbon Corporation
InventorRebecca L. DISTEFANO
Life of this patent
Estimating the term…
Abstract
The disclosure provides sorbents and sorbents that improve the adsorption of per- and polyfluoroalkyl substances (PFAS). The sorbents and sorbents have microstructures that efficiently adsorb PFAS, as shown by the combination of high volumetric iodine number and high volumetric molasses number. Methods of manufacturing and methods of use are further provided.
Claims23
A sorbent for removing one or more perfluoroalkyl and polyfluoroalkyl substances (PFAS) from a fluid,
- the sorbent having a volumetric iodine number of at least about 450 mg/cm3 and a volumetric molasses number of at least about 112 cm−3,
- wherein a bed containing the sorbent can remove perfluorooctanoic acid from at least about 20,000 bed volumes of water containing a concentration of perfluorooctanoic acid of about 61 ng/L or less, thereby producing a filtered water stream, before a concentration of about 15 ng/L perfluorooctanoic acid is detected in the filtered water stream.
(canceled)
A method of removing one or more perfluoroalkyl and polyfluoroalkyl substances from a fluid, the method comprising:
- providing a sorbent having a volumetric iodine number of at least about 450 mg/cm3 and a volumetric molasses number of at least about 112 cm−3;
- and
- contacting the fluid with the sorbent;
- wherein a bed containing the sorbent can remove perfluorooctanoic acid from at least about 20,000 bed volumes of water containing a concentration of perfluorooctanoic acid of about 61 ng/L or less, thereby producing a filtered water stream, before a concentration of about 15 ng/L perfluorooctanoic acid is detected in the filtered water stream.
(canceled)
A sorbent composition comprising one or more sorbents having a volumetric iodine number of at least about 450 mg/cm3 and a volumetric molasses number of at least about 112 cm−3 and a second sorbent, wherein the one or more sorbents comprises reagglomerated activated carbon, reagglomerated reactivated carbon, or a combination thereof.
Dependencies are inferred from the claim text.