Granted Patent
B1
US 12,410,071 · App. 17/505,516 · Granted Sep 9, 2025
System and method for removal of PFAS and other emerging contaminant micro-constituents from landfill leachate and other impacted liquids
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Abstract
A system and method for removing PFAS from residual waste streams generated during the processing of landfill liquids prior to disposal are provided. An example of a landfill liquid is leachate. Landfill leachate can contain dissolved or entrained environmentally harmful substances such as PFAS and other emerging contaminant micro-constituents that may enter the environment if not properly treated. The presently disclosed system and method can improve the removal of PFAS and other emerging contaminant micro-constituents in landfill leachate and/or landfill impacted liquids including stormwater and contaminated groundwater.
Claims (27)
1. A method of removing per- and poly-fluoroalkyl substances (PFAS) from a leachate stream, the method comprising:
introducing the leachate stream comprising per- and poly-fluoroalkyl substances into a primary treatment module, wherein the primary treatment module comprises a solids removal vessel that is configured to remove solids from the leachate stream using membrane filtration and produce an effluent stream; and
passing the effluent stream directly from the solids removal vessel into a secondary treatment module comprising an adsorptive organic/clay based material and configured to adsorb microconstituents from the effluent stream,
wherein there is no removal of total organic carbon (TOC) in a TOC removal vessel prior to adsorption occurring in the secondary treatment module,
and wherein the secondary treatment module produces a treated leachate stream that is substantially devoid of per- and poly-fluoroalkyl substances.
2. The method of claim 1 , wherein the membrane filtration is at least one of nano-filtration and micro-filtration.
3. The method of claim 1 , wherein the secondary treatment module further comprises an ion exchange media resin treatment.
4. A method of removing per- and poly-fluoroalkyl substances (PFAS) from a leachate stream, the method comprising:
introducing the leachate stream comprising per- and poly-fluoroalkyl substances into a primary treatment module consisting essentially of a solids removal vessel that is configured to remove solids from the leachate stream using membrane filtration and produce an effluent stream; and
introducing the effluent stream directly into a secondary treatment module comprising an adsorptive organic/clay based material and configured to adsorb microconstituents from the effluent stream,
wherein the secondary treatment module produces a treated leachate stream that is substantially devoid of per- and poly-fluoroalkyl substances.
5. The method of claim 4 , wherein the membrane filtration is at least one of nano-filtration and micro-filtration.
6. The method of claim 4 , wherein the secondary treatment module further comprises an ion exchange media resin treatment.
7. A method of removing per- and poly-fluoroalkyl substances (PFAS) from a leachate stream, the method comprising:
storing leachate comprising per- and poly-fluoroalkyl substances in a storage vessel;
introducing leachate from the storage vessel directly into a primary treatment module using the leachate stream, wherein the primary treatment module consists essentially of a solids removal vessel that is configured to remove solids from the leachate stream using membrane filtration and produce an effluent stream; and
passing the effluent stream directly from the primary treatment module into a secondary treatment module comprising an adsorptive organic/clay based material and configured to adsorb microconstituents from the effluent stream,
wherein the secondary treatment module produces a treated leachate stream that is substantially devoid of per- and poly-fluoroalkyl substances.
8. The method of claim 7 , wherein the membrane filtration is at least one of nano-filtration and micro-filtration.
9. The method of claim 7 , wherein the secondary treatment module further comprises an ion exchange media resin treatment.
10. A method of removing per- and poly-fluoroalkyl substances (PFAS) from a leachate stream, the method comprising:
storing leachate comprising per- and poly-fluoroalkyl substances in a storage vessel;
introducing leachate from the storage vessel directly into a solids removal vessel using the leachate stream, wherein the solids removal vessel is configured to remove solids from the leachate stream using membrane filtration to produce an effluent stream; and
passing the effluent stream directly from the solids removal vessel into an adsorption treatment vessel configured to adsorb microconstituents from the effluent stream using an adsorptive organic/clay based material,
wherein the adsorption treatment vessel produces a treated leachate stream that is substantially devoid of per- and poly-fluoroalkyl substances.
11. The method of claim 10 , wherein the membrane filtration is at least one of nano-filtration and micro-filtration.
12. The method of claim 10 , further comprising passing the treated leachate stream through an ion exchange media resin treatment.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Oct 19, 2021
From: BRAZIL, BRIAN; MENON, ROHAN
To: WM INTELLECTUAL PROPERTY HOLDINGS, L.L.C.
Reel/Frame 057839/0392 →
Continuity (1)
Provisional Application
63093421
· Oct 19, 2020
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