Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/28—Treatment of water, waste water, or sewage by sorption
  • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
  • B01J20/28011—Other properties, e.g. density, crush strength
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
  • B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
  • B01J20/28076—Pore volume, e.g. total pore volume, mesopore volume, micropore volume being more than 1.0 ml/g
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/3028—Granulating, agglomerating or aggregating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/28—Treatment of water, waste water, or sewage by sorption
  • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
  • B01D2253/10—Inorganic adsorbents
  • B01D2253/102—Carbon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2257/00—Components to be removed
  • B01D2257/20—Halogens or halogen compounds
  • B01D2257/206—Organic halogen compounds
  • B01D2257/2066—Fluorine
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/48—Sorbents characterised by the starting material used for their preparation
  • B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/48—Sorbents characterised by the starting material used for their preparation
  • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
  • B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/48—Sorbents characterised by the starting material used for their preparation
  • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
  • B01J2220/4837—Lignin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/48—Sorbents characterised by the starting material used for their preparation
  • B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
  • B01J2220/4881—Residues from shells, e.g. eggshells, mollusk shells
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2220/00—Aspects relating to sorbent materials
  • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
  • B01J2220/48—Sorbents characterised by the starting material used for their preparation
  • B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
  • B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/30—Organic compounds
  • C02F2101/36—Organic compounds containing halogen

Definitions

• the disclosure describes sorbents that have improved performance in removing per- and polyfluoroalkyl substances, including but not limited to PFOA, PFOS, and similar compounds from liquids and gases.
• Per- and polyfluoroalkyl substances are a group of compounds that include perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and compounds produced by the gENX process such as 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)propanoate and heptafluoropropyl 1,2,2,2-tetrafluoroethyl ether.
• PFOA perfluorooctanoic acid
• PFOS perfluorooctanesulfonic acid
• compounds produced by the gENX process such as 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)propanoate and heptafluoropropyl 1,2,2,2-tetrafluoroethyl ether.
• Such highly fluorinated compounds have enjoyed widespread industrial use for many years, owing to their chemical durability, excellent surfactant properties, and key role
• per- and polyfluoroalkyl substances Unfortunately, these same properties render per- and polyfluoroalkyl substances resistant to degradation in the environment, leading to bioaccumulation when ingested over time.
• Some recent studies have linked per- and polyfluoroalkyl substances to various detrimental health effects, most notably elevated levels of cholesterol, but also kidney cancer, testicular cancer, thyroid disease, and pregnancy-induced hypertension.
• the present disclosure provides sorbents for the removal of one or more per- and polyfluoroalkyl substances from fluids.
• the present disclosure provides a sorbent for removing one or more per- and polyfluoroalkyl substances from a fluid, the sorbent exhibiting a volumetric iodine number of about 450 mg/cm 3 to about 550 mg/cm 3 and a volumetric molasses number of about 100 cm 3 to about 400 cm 3 .
• the sorbent comprises one or more of carbonaceous char, activated carbon, reactivated carbon, and carbon black.
• the sorbent comprises one or both of activated carbon and reactivated carbon, which, in any embodiment, may be formed from a precursor carbonaceous material selected from one or more of bituminous coal, sub -bituminous coal, lignite coal, anthracite coal, wood, wood chips, sawdust, peat, nut shells, pits, coconut shell, babassu nut, macadamia nut, dende nut, peach pit, cherry pit, olive pit, walnut shell, wood, lignin, polymers, nitrogen-containing polymers, resins, petroleum pitches, bagasse, rice hulls, com husks, wheat hulls and chaff, graphenes, carbon nanotubes, and polymer fibers.
• a precursor carbonaceous material selected from one or more of bituminous coal, sub -bituminous coal, lignite coal, anthracite coal, wood, wood chips, sawdust, peat, nut shells, pits, coconut shell, babas
• the activated carbon or reactivated carbon is formed from one or both of bituminous coal and sub-bituminous coal.
• the activated carbon or reactivated carbon is reagglomerated.
• the sorbent has a volumetric iodine number of about 450 mg/cm 3 to about 600 mg/cm 3 and a volumetric molasses number of about 100 cm 3 to about 400 cm 3 .
• a bed containing the sorbent can remove PFOA from at least about 20,000 bed volumes of water containing a concentration of PFOA of about 61 ng/L or less, thereby producing a filtered water stream, before a concentration of about 15 ng/L PFOA is detected in the filtered water stream.
• the present disclosure provides 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/cm 3 and a volumetric molasses number of at least about 100 cm 3 ; and contacting the fluid with the sorbent.
• the sorbent comprises one or more of carbonaceous char, activated carbon, reactivated carbon, and carbon black. [0015] In another embodiment, the sorbent comprises one or both of activated carbon or reactivated carbon.
• the activated carbon or reactivated carbon is formed from a precursor carbonaceous material selected from one or more of bituminous coal, sub- bituminous coal, lignite coal, anthracite coal, wood, wood chips, sawdust, peat, nut shells, pits, coconut shell, babassu nut, macadamia nut, dende nut, peach pit, cherry pit, olive pit, walnut shell, wood, lignin, polymers, nitrogen-containing polymers, resins, petroleum pitches, bagasse, rice hulls, com husks, wheat hulls and chaff, graphenes, carbon nanotubes, and polymer fibers.
• the activated carbon or reactivated carbon is formed from one or more of bituminous coal and sub-bituminous coal.
• the activated carbon or reactivated carbon is reagglomerated.
• the sorbent has a volumetric iodine number of about 450 mg/cm 3 to about 600 mg/cm 3 and a volumetric molasses number of about 100 cm 3 to about 400 cm 3 .
• the sorbent has a volumetric iodine number is about 500 mg/cm 3 to about 550 mg/cm 3 and the volumetric molasses number of about 110 cm 3 to about 350 cm 3 .
• a bed containing the sorbent can remove PFOA from at least about 20,000 bed volumes of water containing a concentration of PFOA of about 61 ng/L or less, thereby producing a filtered water stream, before a concentration of about 15 ng/L PFOA is detected in the filtered water stream.
• the present disclosure provides a sorbent composition
• a sorbent composition comprising one or more sorbents having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 and optionally a second sorbent.
• the sorbent composition comprises one or more inert materials, fillers, binders, or other compositions that do not possess any appreciable sorbent capacity.
• the sorbent has a volumetric iodine number of about 450 mg/cm 3 to about 600 mg/cm 3 and a volumetric molasses number of about 100 cm 3 to about 400 cm 3 .
• the sorbent has a volumetric iodine number is about 500 mg/cm 3 to about 550 mg/cm 3 and the volumetric molasses number of about 110 cm 3 to about 350 cm 3 .
• a bed containing the sorbent composition can remove PFOA from at least about 20,000 bed volumes of water containing a concentration of PFOA of about 61 ng/L or less, thereby producing a filtered water stream, before a concentration of about 15 ng/L PFOA is detected in the filtered water stream.
• FIG. 1 provides one example of a decolorization curve of a sample of a sorbent, as disclosed herein.
• FIG. 2 depicts a UV-Vis transmittance spectrum collected from a sample of a filtrate of a molasses solution after treatment with activated carbon.
• FIG. 3 provides a plot of perfluorooctanoic acid (PFOA) concentration measured in water at the exit port of a sorbent bed comprising sorbents of varying molasses numbers, normalized to the untreated water versus the number of bed volumes of water that passed through the bed.
• PFOA perfluorooctanoic acid
• FIG. 4A provides a scatter plot of volumetric molasses number and the volume iodine number of various sorbents, as described herein, versus the bed volume equivalent when the concentration of PFOA in the water at the exit port of the bed reaches 25% of the PFOA concentration in the untreated water.
• FIG. 4B provides a plot of the bed volume equivalent when the concentration of PFOA in the water at the exit port of the bed reaches 25% of the PFOA concentration in the untreated water as a function of the volumetric molasses number of the sorbent in the bed.
• the term “about” means plus or minus 10% of the numerical value of the number with which it is modifying. Therefore, about 50% means in the range of 45%- 55%.
• the term “about” refers to the named temperature ⁇ 5 degrees.
• sorbent composition means a material or mixture of materials that comprises a sorbent.
• the sorbent composition can be formed entirely of sorbent media, or the sorbent can alternatively include one or more inert materials, fillers, binders, or other compositions that do not possess any appreciable sorbent capacity.
• sorbent media means all known materials from any source capable of adsorbing or absorbing liquids and/or gases.
• sorbent media may include, as non-limiting examples, one or more of carbonaceous char, activated carbon, reactivated carbon, carbon nanotubes, graphenes, natural and synthetic zeolite, silica, silica gel, alumina, polystyrene sulfonate, alumina, zirconia, and diatomaceous earth.
• per- and polyfluoroalkyl substances means any perfluoroalkyl or polyfluoroalkyl substance, mixture of such substances, or derivative of one or more such substances.
• per- and polyfluoroalkyl substances include perfluoroalkyl sulfonates, perfluoroalkane sulfonic acids (PFSA), N-butyl perfluoroalkane sulfonamides (BuFASA), N-butyl perfluoroalkane sulfonamido ethanols (BuFASE), N-butyl perfluoroalkane sulfonamido acetic acids (BuFASAA), N-ethyl perfluoroalkane sulfonamides (EtFASA), N-ethyl perfluoroalkane sulfonamido ethanols (EtFASE), N-ethyl perfluoroalkyl
• APFO ammonium perfluorooctanoate
• MeFOSA N-methyl perfluorooctane sulfonamide
• PFOA perfluorooctane sulfonate
• PFOS perfluorooctanesulfonic acid
• 2,3,3,3,-tetrafluoro-2-(heptafluoropropoxy)propanoate ammonium 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)propanoate, 1,2,2,2-tetrafluoroethyl ether
• 4:2-fluorotelomersulfonic acid (4:2 FtS), 6:2-fluorotelomersulfonic acid (6:2 FtS), 8:2- fluorotelomersulfonic acid (8:2 FtS), per
• iodine number or “IV” refers to either a gravimetric iodine number or a volumetric iodine number.
• the iodine number is a measure of the equilibrium mass of iodine adsorbed on the surface of a normalized amount of a sorbent.
• the iodine number is a measure of the surface area and porosity of a sorbent.
• gravimetric iodine number or “IV ” means the property of a sorbent that is formed from carbonaceous material as determined by the industry standard test ASTM D4607-14. gravimetric iodine number is reported in units of mass of iodine adsorbed per mass a sorbent.
• volumetric iodine number or “IV v ” means the product of the gravimetric iodine number and the apparent density of a sorbent.
• the apparent density of the sorbent is obtained by the industry standard test ASTM D2854-09 (2019).
• the gravimetric iodine number has the meaning described in the preceding paragraph.
• the volumetric iodine number is reported in units of mass of iodine adsorbed per volume of sorbent.
• molasses number or “MN” refers to either a gravimetric molasses number or a volumetric molasses number. Molasses number is a measure of the decolorization capacity of a sorbent and is an indicator of the macro pore and transport pore structure of the sorbent.
• gravimetric molasses number or “MN g ” means the determination of the decolorizing capacity of a sorbent in accordance with Calgon Carbon Method Number TM-3 entitled “Determination of the Molasses Number of Activated Carbon.” The full test procedure is described fully herein. The gravimetric molasses number is reported as a unitless quantity measured per mass of sorbent.
• volumetric molasses number means the product of the gravimetric molasses number and the apparent density of a sorbent.
• the gravimetric molasses number has the meaning described in the preceding paragraph.
• the apparent density of a sorbent is obtained by the industry standard test ASTM D2854-09 (2019).
• the volumetric molasses number is reported as a unitless quantity measured per volume of sorbent.
• the disclosure provides a sorbent composition
• a sorbent composition comprising at least one sorbent effective in removing one or more per- and polyfluoroalkyl substances, as described above, from a fluid.
• the at least one sorbent exhibits a volumetric iodine number of at least about 450 mg/cm 3 (e.g. about 450 mg/cm 3 to about 600 mg/cm 3 ) and a volumetric molasses number of at least about 100 cm 3 (e.g, about 100 cm 3 to about 400 cm 3 ).
• a sorbent having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 may exhibit an excellent capacity for the adsorption of one or more per- and polyfluoroalkyl substances.
• the one or more sorbents exhibit a volumetric iodine number of at least about 460 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 470 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 480 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 490 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 500 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 510 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 520 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 530 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 540 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 550 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 560 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 570 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In one embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 580 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In any embodiment, the one or more sorbents exhibit a volumetric iodine number of at least about 590 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 .
• the one or more sorbents exhibit a volumetric iodine number of at least about 600 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 . In any embodiment, the one or more sorbents exhibit a volumetric iodine number of about 450 mg/cm 3 to about 500 mg/cm 3 , about 470 mg/cm 3 to about 550 mg/cm 3 , about 500 mg/cm 3 to about 550 mg/cm 3 , about 520 mg/cm 3 to about 550 mg/cm 3 , or about 490 mg/cm 3 to about 520 mg/cm 3 .
• the preceding values and ranges can be used alone or in combination, and any range may be formed by selecting two or more of the above endpoints.
• the one or more sorbents exhibit a volumetric molasses number of about 100 cm 3 , about 110 cm 3 , about 120 cm 3 , about 130 cm 3 , about 140 cm 3 , about 150 cm 3 , about 160 cm 3 , about 170 cm 3 , about 180 cm 3 , about 190 cm 3 , about 200 cm 3 , about 210 cm 3 , about 220 cm 3 , about 230 cm 3 , about 240 cm 3 , about 250 cm 3 , about 260 cm 3 , about 270 cm 3 , about 280 cm 3 , about 290 cm 3 , about 300 cm 3 , about 310 cm 3 , about 320 cm 3 , about 330 cm 3 , about 340 cm 3 , about 350 cm 3 , about 360 cm 3 , about 370 cm 3 , about 380 cm 3 , about 390 cm 3 , about 400 cm 3 or any range that is formed by selecting two or more of the
• the apparent density of a sorbent is not limited and may, in any embodiment, be less than about 1.00 g/cm 3 , less than about 0.95 g/cm 3 , less than about 0.90 g/cm 3 , less than about 0.85 g/cm 3 , less than about 0.80 g/cm 3 , less than about 0.75 g/cm 3 , less than about 0.70 g/cm 3 , less than about 0.65 g/cm 3 , less than about 0.60 g/cm 3 , less than about 0.55 g/cm 3 , less than about 0.50 g/cm 3 , less than about 0.45 g/cm 3 , less than about 0.40 g/cm 3 , or less than about 0.35 g/cm 3 .
• the apparent density of the sorbent may be about 1.00 g/cm 3 , about 0.95 g/cm 3 , about 0.90 g/cm 3 , about 0.85 g/cm 3 , about 0.80 g/cm 3 , about 0.75 g/cm 3 , about 0.70 g/cm 3 , about 0.65 g/cm 3 , about 0.60 g/cm 3 , about 0.55 g/cm 3 , about 0.50 g/cm 3 , about 0.45 g/cm 3 , about 0.40 g/cm 3 , about 0.35 g/cm 3 , about 0.30 g/cm 3 , or any range that is formed from any two of those values as endpoints.
• the apparent density of a sorbent may be about 0.30 g/cm 3 to about 1.00 g/cm 3 , about 0.30 g/cm 3 to about 0.95 g/cm 3 , about 0.30 g/cm 3 to about 0.90 g/cm 3 , about 0.30 g/cm 3 to about 0.85 g/cm 3 , about 0.30 g/cm 3 to about 0.80 g/cm 3 , about 0.30 g/cm 3 to about 0.75 g/cm 3 , about 0.30 g/cm 3 to about 0.70 g/cm 3 , about 0.30 g/cm 3 to about 0.65 g/cm 3 , about 0.30 g/cm 3 to about 0.60 g/cm 3 , about 0.30 g/cm 3 to about 0.55 g/cm 3 , about 0.30 g/cm 3 to about 0.50 g/cm 3 , about 0.30 g/cm 3
• a sorbent composition may comprise one or more sorbents, each sorbent comprising or derived from a sorbent media selected from (but not limited to) one or more of carbonaceous char, activated carbon, carbon nanotube, graphene, reactivated carbon, carbon black, natural and synthetic zeolite, silica, silica gel, alumina, alumina clay, zirconia, diatomaceous earth, and metal oxides.
• a sorbent composition comprising one or more sorbents may comprise or be derived from, in any embodiment, a single type of sorbent media or may be combined with a sorbent comprising or derived from one or more additional types of sorbent or non-sorbent media.
• a sorbent composition comprises two or more types of sorbents
• the two or more sorbents may be mixed together and may comprise or be derived from from the same or different precursor materials selected from those described above.
• the one or more sorbents may comprise one or both of activated carbon and reactivated carbon.
• the activated and/or reactivated carbon may be prepared from any precursor carbonaceous material known in the art including, but not limited to, bituminous coal, sub-bituminous coal, lignite coal, anthracite coal, wood, wood chips, coconut including coconut shell, sawdust, peat, nut shells, pits, babassu nut, macadamia nut, dende nut, peach pit, cherry pit, olive pit, walnut shell, wood, lignin, polymers, nitrogen-containing polymers, resins, petroleum pitches, bagasse, rice hulls, com husks, wheat hulls and chaff, graphenes, carbon nanotubes, polymer fibers, any other carbonaceous material, or any combination thereof.
• reactivated carbon may be derived from activated carbon of any origin that has been exhausted or substantially exhausted from use.
• Activated carbon and reactivated carbon suitable for use in the sorbent and sorbent compositions disclosed herein may be of any grade or type, selected based on performance requirements, cost, and/or other considerations.
• Activated carbon or reactivated carbon may be employed in one or more of powdered form, which is referred to as “powdered activated carbon” or “PAC”, granular form, which is referred to as “granular activated carbon” or “GAC”, or pellet form, which is referred to as pelletized activated carbon.
• a sorbent may comprise activated or reactivated carbon in one of PAC, GAC, or pelletized form, or may comprise a mixture of two or more forms.
• Powdered activated carbon (PAC) as used herein to defined as particles that pass through an 80-mesh sieve (holes of about 0.180 mm).
• Granular activated carbon (GAC) as used herein, is defined as activated carbon particles sized to be retained on a 50-mesh sieve (holes of about 0.300 mm). While these particle size ranges are mentioned for activated carbon sorbents, it is also contemplated that any of the disclosed sorbents may be measured by the above 50-mesh and 80-mesh sieve sizes.
• a sorbent composition may comprise one or more components additional to the sorbent having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 , such as an additional sorbent for removing one or more one or more per- and polyfluoroalkyl substances, a sorbent for removing a non-PFAS compound, or a non-sorbent.
• a sorbent composition may comprise at least two different sorbent types, each effective to absorb or adsorb one or more per- and polyfluoroalkyl substances.
• a sorbent composition as described herein may further include at least one compound that is not a sorbent and which cannot substantially absorb or adsorb per- and polyfluoroalkyl substances or any other compound.
• a sorbent composition may be formed comprising sorbent having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 and a non-sorbent which is a binder.
• a composition may be molded, extruded, or otherwise formed into one or more shapes, such as pellets.
• the type of binder is not particularly limited and may include any organic or inorganic binder known in the art. As examples of inorganic binder, metals, ceramics, clays, glasses, or combinations of one or more of the above are commonly used.
• a sorbent composition comprising one or more sorbents having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 , as described herein, may be provided within a container.
• a container may hold a sorbent composition comprising the one or more sorbents having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 is configured and sized to receive a fluid (i.e., liquid or gas) and convey said fluid over or through the container, thus bringing fluid in contact with the sorbent composition and one or more sorbents thereof.
• the type of container is not particularly limited.
• the container may be a permanent container that is installed within a device or process facility and which is connected by piping or other fluid conduits so that the liquid or gas flows through the container.
• spent sorbent may be emptied from the container and replaced by one or both of virgin sorbents or reactivated sorbents in order to ensure that the sorbents remain effective in removing per- and polyfluoroalkyl substances or chemically similar or chemically related compounds from liquid or gas that flows through the container.
• the physical form of the sorbent composition comprising one or more sorbents that is provided within the container is not limited and may be provided loose (alone) or formed as a cartridge with other structural materials that hold it in place.
• a container itself is may be designed to be replaced rapidly and with minimal change to outside components such as pumps and conduits that convey the liquids or gases to the container.
• the container may be referred to as a “cartridge,” and it can be connected and disconnected from surrounding components.
• a cartridge may be disposable, such as in consumer drinking water applications.
• a cartridge may be intended to be refurbished, with the cartridge containing spent sorbent returned for cleaning or reactivation of the sorbent, refilled with fresh virgin or reactivated sorbent, and returned to service following completion of the refurbishing operation.
• a sorbent composition comprises one or more sorbents effective in removing one or more per- and polyfluoroalkyl substances and exhibiting a volumetric iodine number of at least about 450 mg/cm 3 (e.g. about 450 mg/cm 3 to about 600 mg/cm 3 ) and a volumetric molasses number of at least about 100 cm 3 (e.g, about 100 cm 3 to about 400 cm 3 ).
• the one or more sorbents having a volumetric iodine number of at least about 450 mg/cm 3 and a volumetric molasses number of at least about 100 cm 3 may be formed from one or more precursor material selected from, but not limited to, carbonaceous char, activated carbon, carbon nanotube, graphene, reactivated carbon, carbon black, natural and synthetic zeolite, silica, silica gel, alumina, alumina clay, zirconia, diatomaceous earth, and metal oxides.
• the sorbent comprises activated carbon or reactivated carbon.
• the activated carbon and reactivated carbon may be of any grade or type, such as PAC, GAC, pelletized activated carbon, any reactivated form thereof, or any combination thereof.
• Granular activated or reactivated carbon may be formed by pulverizing a precursor carbonaceous material to a powder of a desired size.
• the powder may optionally be mixed with a binder.
• the pulverized material optionally with a binder, may then be formed into briquettes which may then be subsequently ground into granules of a desired size.
• the resultant granular material may then be carbonized to alter its properties, such as, but not limited to, removing volatile compounds and activating the precursor carbonaceous material.
• Pelletized activated carbon may be formed by pulverizing a precursor carbonaceous material, combining the pulverized material with a binder, and extruding the mixture into pellets. The pellets may then be carbonized to alter its properties, such as, but not limited to, removing volatile compounds and activating the precursor carbonaceous material.
• a sorbent made from activated carbon and/or reactivated carbon may be formed by any process known in the art, provided the end sorbent product exhibits, as recited above, a volumetric iodine number of at least about 450 mg/cm 3 ( e.g . about 450 mg/cm 3 to about 600 mg/cm 3 ) and a volumetric molasses number of at least about 100 cm 3 (e.g., about 100 cm 3 to about 400 cm 3 ).
• activated carbon may be formed by oxidizing and devolatizing a virgin carbonaceous material with steam and/or carbon dioxide gasified to form the desired pore structure in the activated carbon thereby providing the desired material properties (e.g, gravimetric iodine number, gravimetric molasses number).
• Initial oxidation and devolatilization processes may, in any embodiment, include a chemical treatment with a dehydrating chemical, such as phosphoric acid, sulfuric acid, sodium hydroxide, potassium hydroxide, or any combination thereof.
• suitable activated carbon may be formed by a direct activation process.
• Such activated carbon sorbent is sometimes referred to as a direct activated carbon.
• the precursor carbonaceous material which is usually coal is crushed and sized. The crushed and sized precursor carbonaceous material is then carbonized and thermally activated.
• a suitable sorbent may comprise a reactivated sorbent that has previously had its sorbent capacity exhausted or substantially exhausted and that has been reactivated to restore at least some of the original sorbent capacity. Any of the above listed sorbents can be reactivated following exhaustion, and the reactivation can be performed by heat, pressure, chemical exposure, or any combination thereof.
• a reactivated sorbent may comprise reactivated carbon. Reactivated carbon may be manufactured by heating spent, exhausted activated carbon in a low oxygen atmosphere using steam as a selective oxidant. During reactivation, absorbed and adsorbed organic compounds may be either volatilized from the activated carbon or pyrolized to form carbon char.
• Heating may take place at a temperature above about 500°C (e.g, about 500°C to about 1100°C), more particularly above about 700°C (e.g. about 700°C to about 1100°C), and the resulting reactivated carbon may thereafter be reused for various purposes including water treatment.
• any process may be utilized to yield a sorbent with a volumetric iodine number of at least about 450 mg/cm 3 (e.g.
• volumetric iodine number and the volumetric molasses number of a particular sorbent are influenced by many factors, including the choice of the one or more of the precursor carbonaceous material/s and processing steps that are performed on the precursor carbonaceous material/s. For example, in general, continued steam activation of precursor carbonaceous material generally increases gravimetric iodine number and gravimetric molasses number but simultaneously decreases the apparent density of a carbonaceous materials.
• the sorbents of the disclosure are primarily disclosed as removing per- and polyfluoroalkyl substances, or chemically similar or chemically related compounds, the use of the sorbents is not so limited.
• the sorbents are suitable for removing any compounds and/or byproducts that cause taste and odor problems in water. Such compounds are referred to as “taste and odor compounds” throughout the application.
• Examples of such taste and odor compounds include one or more of trans-1, 10-dimethyl -trans- 9-decalol (“Geosmin”), 2-methylisoborneol (MIB), isopropylmethoxypyrazine (IPMP), isobutylmethoxypyrazine (IBMP), methyl tertiary butyl ether (MTBE), 2,4-heptadienal, decandienal, octanal, chlorine, chloramine, chlorophenols, iodoform, hydrocarbons, and volatile organic compounds (VOCs).
• Geosmin 2-methylisoborneol
• IPMP isopropylmethoxypyrazine
• IBMP isobutylmethoxypyrazine
• MTBE methyl tertiary butyl ether
• VOCs volatile organic compounds
• volumetric iodine number surface and pore morphology of a sorbent is described by the combination of the volumetric iodine number and volumetric molasses number. While not wishing to be bound by theory, the combination of the volumetric iodine number and the volumetric molasses number together describe both the overall adsorptive capacity of the sorbent and the kinds of molecules that the sorbent is effective at adsorbing. Following intensive experiments, Applicants determined that a sorbent that has only one of a volumetric iodine number of at least about 450 mg/cm 3 (e.g.
• a material that has a very high measured value for one of a gravimetric iodine number and gravimetric molasses number cannot compensate for a lowered measured value in other.
• Applicants also determined that it is the volumetric measurements and not the gravimetric measurements that best describe the performance of the sorbent with respect to per- and polyfluoroalkyl substances, and as such, the apparent density is likewise important in providing effective sorbent compositions and sorbents for the removal of per- and polyfluoroalkyl substances from a fluid.
• a sorbent formed by processes described herein having a volumetric iodine number of at least about 450 mg/cm 3 (e.g. about 450 mg/cm 3 to about 600 mg/cm 3 ) and a volumetric molasses number of at least about 100 cm 3 (e.g, about 100 cm 3 to about 400 cm 3 ) lends itself excellent performance in removing one or more per- and polyfluoroalkyl substances from a fluid, such as water (e.g, drinking water).
• a fluid such as water (e.g, drinking water).
• a method of removing one or more per- and polyfluoroalkyl substances from a fluid comprising contacting a sorbent composition comprising one or more sorbents, as disclosed herein, with a fluid containing one or more per- and polyfluoroalkyl substances compounds.
• a sorbent composition comprising one or more sorbents, as disclosed herein, with a fluid containing one or more per- and polyfluoroalkyl substances compounds.
• at least one of the one or more sorbents exhibit a volumetric iodine number of at least about 450 mg/cm 3 (e.g. about 450 mg/cm 3 to about 600 mg/cm 3 ) and a volumetric molasses number of at least about 100 cm 3 (e.g, about 100 cm 3 to about 400 cm 3 ).
• a stream comprising a fluid may be passed through or over a bed comprising a sorbent composition comprising one or more sorbents.
• a sorbent composition comprising one or more sorbents may be injected into or otherwise combined with the fluid.
• a sorbent composition comprising the one or more sorbents may be collected from the fluid after adsorbing a desired quantity of one or more per- and polyfluoroalkyl substances from the fluid, for example, through filtering the fluid to isolate the sorbent composition.
• the makeup of the fluid is not limited and may include, in any embodiment, one or more of liquid water, water vapor, air, and soil.
• Gravimetric iodine number of the activated carbon samples was measured in accordance with ASTM D4607-14. Gravimetric iodine number is reported in units of milligrams of iodine adsorbed per gram of activated carbon sample.
• volumetric iodine number the apparent density (pt,) of the activated carbon samples was measured according to the industry standard test ASTM D2854- 09 (2019). After the gravimetric iodine number and the apparent density were obtained, the volumetric iodine number was determined by multiplying the gravimetric iodine number by the apparent density. Volumetric iodine number is thus reported in units of milligrams per cubic centimeter.
• TM-3 Calgon Carbon Corporation Test Method Number
• MN V volumetric molasses number
• a “Standard Carbon” is an activated carbon sorbent that is a reference material for the property of the gravimetric molasses number.
• a “200 Standard Carbon” can be expected to result in a gravimetric molasses number of 200
• a “250 Standard Carbon” can be expected to have a gravimetric molasses number of 250
• a 200 Standard Carbon must be used for activated carbon products predicted to have less than a 230 gravimetric molasses number.
• a 250 Standard Carbon must be used for activated carbon products predicted to have less than 350 gravimetric molasses number.
• a 400 Standard Carbon must be used for activated carbon products predicted to have a 350 or greater gravimetric molasses number. Whenever a product has a molasses specification range that includes a Molasses Standard Carbon limit, the higher Molasses Standard Carbon should be used. In these cases, it is appropriate to include the Molasses Standard Carbon to be utilized on the Product Specification as a note to manufacturing. The molasses solutions cannot be diluted. A fixed path length of 2.5 mm must be used.
• the Standard Carbon is not limited so long as it is a suitable reference material for the molasses number.
• a 400 Standard Carbon is “RB,” which is available from Calgon Carbon Corporation of Moon Township, PA.
• RB is a powdered, steam -activated carbon made from bituminous coal that has a minimum gravimetric iodine number of 1070 mg/g, a gravimetric molasses number of 400, a maximum ash content of 23 wt.%, a maximum moisture content of 2 wt.%, and 60-75 wt.% of particles screened at 325 mesh or having sizes of less than 44 pm.
• a second example of a 320 Standard Carbon is “RC,” which is available from Calgon Carbon Corporation of Moon Township, PA.
• RC is a powdered, steam -activated carbon made from bituminous coal that has a minimum gravimetric iodine number of 1020 mg/g, a gravimetric molasses number of 320, a maximum ash content of 23 wt.%, a maximum moisture content of 2 wt.%, and 60-75 wt.% of particles screened at 325 mesh or having sizes of less than 44 pm.
• a third example of a 230 Standard Carbon is “BL,” which is available from Calgon Carbon Corporation of Moon Township, PA.
• BL is a powdered, steam-activated carbon made from bituminous coal that has a minimum gravimetric iodine number of 1000 mg/g, a gravimetric molasses number of 230, a maximum ash content of 10 wt.%, a maximum moisture content of 2 wt.%, and 60-75 wt.% of particles screened at 325 mesh or having sizes of less than 44 pm.
• a solution of blackstrap molasses is treated with standard carbon having a known molasses number (“Molasses Standard Carbon”), filtered, and the filtrate analyzed by UV-vis spectrophotometry to generate a relationship between molasses number and absorbance.
• the solution of blackstrap molasses is then treated with a samples of carbon of unknown decolorizing capacity/unknown molasses number (e.g ., a sorbent as provided herein), filtered, and the filtrate analyzed in the same manner.
• a sample of carbon of unknown decolorizing capacity/unknown molasses number e.g ., a sorbent as provided herein
• the higher the capacity of a sorbent to decolorize the molasses composition i.e., decolorization
• the lighter the filtrate will be and conversely, the lower the absorbance.
• a higher molasses number therefore corresponds to a higher capacity for decolorization, as shown in FIG. 1.
• the absorbance of each filtrate is determined on a standard spectrophotometer at a wavelength of 472 nm with a path length of 2.5 mm (FIG. 2 depicts the transmittance spectrum of a representative filtrate).
• the molasses number of each sample is calculated from the ratio of the absorbance values of the sample and the standard carbon:
• Molasses Number (A c B) / C wherein A is the molasses number of the standard carbon with known molasses number; B is the average absorbance of three measurements for the standard carbon with known molasses number; and C is the absorbance of the filtrate of the sorbent being analyzed (i.e., with unknown molasses number).
• the beaker was covered with aluminum foil or a large glass cover, placed on a hotplate, and heated to 95 °C.
• the molasses solution from the stainless steel beaker was siphoned into a suitable container.
• a piece of TYGON tubing was placed in the beaker so the end of the tubing was one inch off of the bottom of the beaker.
• a pipette bulb was used to begin the siphon.
• the solution was syphon into a separate container (e.g., a large glass bottle).
• thermocouple/thermometer was placed in the beaker so the tip rests on the bottom of the beaker.
• the solution was heated until the thermocouple/thermometer reaches 98°C and a stopwatch was started.
• the thermocouple or thermometer was removed and the solution was allowed to boil for 30 seconds.
• the sample was filtered by vacuum through a Buchner funnel using a WHATMAN® No. 3 filter paper which was previously prepared. The filter was covered with about 20 mL of the solution and this filtrate was discarded. The remaining portion was filtered.
• thermocouple/thermometer was placed in the beaker so the tip rests on the bottom of the beaker.
• the solution was heated until the thermocouple/thermometer reached 98°C and a stopwatch was started.
• the thermocouple or thermometer was removed and the solution was allowed to boil for 30 seconds.
• the sample was filtered by vacuum through a Buchner funnel using WHATMAN® No. 3 filter paper which was previously prepared. The filter was covered with about 20 mL of the solution and this filtrate was discarded. The remaining 30 mL portion was filtered and the filtrate used for subsequent measurements.
• Filtration setups for sample filtration were prepared. A WHATMAN® No. 3 filter circle was placed in the Buchner funnel. The funnel was connected to the 250 mL filtering flask and the filtration vacuum was initiated. 50 mL of the filter paper suspension was added while making sure to coat the entire surface of the filter paper circle. After all the liquid was drained, the filtrate collected in the filtering flask was discarded.
• thermocouple or thermometer was placed in the beaker so the tip rests on the bottom of the beaker.
• the solution was heated until the thermocouple read 98°C and a stopwatch was started.
• the thermocouple or thermometer was removed and the solution was allowed to boil for 30 seconds.
• the sample was filtered by vacuum through a Buchner funnel using a WHATMAN® No. 3 filter paper which was previously prepared according to Step 3.
• the filter was covered with about 20 mL of the sample and this filtrate was discarded. The remaining portion was filtered.
• A is the molasses number of the Standard Carbon (250 or other); B is the average absorbance of three determinations for the 250 Standard Carbon or other Standard Carbon; and C is the absorbance of the filtrate of the activated carbon being analyzed.
• Samples of 12x40 granular activated carbon for use in fixed or moving beds for the purification and decolorization of aqueous and organic liquids were prepared for Example 1.
• the samples were reagglomerated activated carbon formed from bituminous coal.
• the bituminous coal was first pulverized to a powder, followed by the addition of binder to the powder.
• the powder and binder were then reagglomerated into briquettes. Following briquetting, the briquettes were crushed and sized. Sizing retained only particle sizes between 12 mesh (1.70 mm hole size) and 40 mesh (0.425 mm hole size). Note that as described herein, mesh sizes are by US mesh size.
• the mean particle diameter of the sample batches was between 0.9 mm - 1.1 mm, and the amount of granular activated carbon having a particle size greater than 12 mesh (1.70 mm) was no more than 5.0 wt.%.
• the amount of granular activated carbon having a particle size less than 40 mesh (0.425 mm) was no more than 4 wt.%.
• the crushed and sized particles were carbonized followed by thermal activation. Following thermal activation, the granular activated carbon of Example 1 has a moisture content of less than 2 wt.% when measured by ASTM D2867 and an abrasion number of 75 when measured by AWWA B604, and the apparent density as measured by ASTM D2854-09 was 0.49 g/cm 3 .
• Samples of granular activated carbon were prepared for Comparative Example 1.
• the samples were activated carbon formed from coconut shell.
• the coconut shells were first treated by slow pyrolysis to form a charcoal.
• Sizing was performed in accordance with ASTM D2862-16 to retain only particle sizes between 12 mesh (1.70 mm hole size) and 40 mesh (0.425 mm hole size).
• the amount of granular activated carbon having a particle size greater than 12 mesh (1.70 mm) was no more than 5 wt.%.
• the amount of granular activated carbon having a particle size less than 40 mesh (0.425 mm) was no more than 4 wt.%.
• the sized particles were next thermally activated.
• the hardness number of the resulting granular activated carbon as measured by ASTM D3802 was at least 95.
• the apparent density as measured by ASTM D2854 of the resulting granular activated carbon was 0.48 g/cm 3 .
• Samples of granular activated carbon were prepared for Comparative Example 2.
• the samples were reagglomerated activated carbon formed from bituminous coal.
• the bituminous coal was first pulverized to a powder, followed by the addition of binder to the powder.
• the powder and binder were then reagglomerated into briquettes. Following briquetting, the briquettes were crushed and sized. Sizing was performed in accordance with ASTM D2862-16 to retain only particle sizes between 12 mesh (1.70 mm hole size) and 40 mesh (0.425 mm hole size). The amount of particles having a size greater than 12 mesh (1.70 mm) was no more than 5 wt.%.
• HYDRODARCO 4000 is a lignite-based granular activated carbon that is sized in accordance with ASTM D2862-16 to retain only particle sizes between 12 mesh (1.70 mm hole size) and 40 mesh (0.425 mm hole size).
• the amount of granular activated carbon having a particle size greater than 12 mesh (1.70 mm) was no more than 5 wt.%.
• the amount of granular activated carbon having a particle size less than 40 mesh (0.425 mm) was no more than 4 wt.%.
• the activated carbon of Comparative Example 4 is a granular activated carbon that is formed by the direct activation of bituminous coal.
• Examples 1-3 and Comparative Examples 1-4 were tested for effectiveness at removing specified per- and polyfluoroalkyl substances.
• RSSCT Rapid Small Scale Column Test
• bed volumes is the volume of water that passed through the activated carbon beds divided by the volume of the beds themselves.
• PFOA is perfluorooctanoic acid (known also by the IUPAC nomenclature pentadecafluorooctanoic acid or simply C8).
• Examples 1-3 and Comparative Examples 1-4 were tested for the amount of water that could pass through a bed of the activated carbon before at least 25% of the concentration of the contaminant PFOA “broke through” the activated carbon bed, that is, was detected in the filtered water. The results are shown below in Table 3. Examples 1 -3 and Comparative Examples 1 -3 were also tested for the amount of water that could pass through a bed of the activated carbon before at least 25% of the concentration of the contaminant 4:2 FtS “broke through” the activated carbon bed.
• FtS is 4:2 fluorotelomer sulfonic acid and is a PER- AND POLYFLUOROALKYL SUBSTANCES that has a low molecular weight, making it difficult to adsorb.
• FIG. 3 plots the normalized concentration of PFOA measured in the column effluent versus the number of bed volumes of water that pass through a bed of activated carbon sorbent.
• a concentration of PFOA was present in incoming water.
• the horizontal line corresponds to 25% of the initial concentration of PFOA measured at the exit port of the bed of activated carbon sorbent.
• the larger the portion of the plotted curve that is present below the horizontal line the better the performance.
• FIG. 4A plots on the horizontal axis the number of bed volumes until 25% of PFOA breaks through a bed of activated carbon sorbent.
• a concentration of PFOA was present in incoming water.
• Each vertical pair of data points represents a single experimental test.
• the dotted vertical line represents a single material that was tested and exhibited 25% PFOA breakthrough at about 10,000 bed volumes. That material has a volumetric molasses number of about 160 cm 3 (represented by the square that is intersected by the vertical line) and a volume iodine number of about 250 mg/cm 3 (represented by a diamond that is intersected by the vertical line).
• FIG. 4B plots the bed volume equivalent at 25% of the PFOA measured at the exit port of the bed as a function of the volumetric molasses number of the samples. Each of the samples is the same as those shown in FIG. 4A. Two correlations were also found. First, an overall correlation was performed for all of the data points, which resulted in a R 2 value of 0.8968. This indicates a poor fit.
• the inventors also discovered that if a second correlation was performed for all data points excluding those data points having a volumetric iodine number of less than about 450 mg/cm 3 and volumetric molasses number of less than about 100 cm 3 , the R 2 value improved to 0.9928, indicating an excellent fit.

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