Method for removing per- and polyfluoroalkyl substances (PFAS) from waste water
AssigneeRepublic Services, Inc.
InventorsPavan Puttamraju, Kevin D. Torrens, Yun Yu
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Abstract
Disclosed is a method for enhancing the removal of a per- and polyfluoroalkyl substances (PFAS) component from waste water using a cationic polymer (e.g., a cationic polymer flocculant or coagulant). The cationic polymer enables gas that is diffused through the waste water to carry at least a portion of the PFAS component to the surface of water, creating a foam that can then be removed.
Claims34
A method for treating waste water to enhance the removal of a per- and polyfluoroalkyl substances (PFAS) component from waste water, the method comprising:
- a) contacting the waste water comprising water and the PFAS component with a cationic polymer, wherein the cationic polymer comprises at least one of a polyacrylamide, a polyacrylic acid, a polydiallyldimethyl ammonium, or a polyamine;
- b) bubbling a gas through the waste water to form a foam on the surface of the waste water comprising the gas and at least some of the PFAS component;
- and
- c) removing at least some of the foam off the surface of the waste water, thereby removing at least some of the PFAS component from the waste water to form a lower PFAS component content waste water;
- wherein the method steps a-c all take place in the same vessel.
A method for treating waste water to enhance the removal of a per- and polyfluoroalkyl substances (PFAS) component from waste water, the method consisting essentially of:
- a) contacting the waste water comprising water and the PFAS component with a cationic polymer, wherein the cationic polymer comprises at least one of a polyacrylamide, a polyacrylic acid, a polydiallyldimethyl ammonium, or a polyamine;
- b) bubbling a gas through the waste water to form a foam on the surface of the waste water comprising the gas and at least some of the PFAS component;
- and
- c) removing at least some of the foam off the surface of the waste water, thereby removing at least some of the PFAS component from the waste water to form a lower PFAS component content waste water.
A method for treating waste water to enhance the removal of a per- and polyfluoroalkyl substances (PFAS) component from waste water, the method comprising:
- a) contacting the waste water comprising water and the PFAS component with a cationic polymer, wherein the cationic polymer comprises:
- i) a polydiallyldimethyl ammonium having the following repeating unit:
- wherein X is an anion;
- ii) or a polyamine having the following repeating unit:
- wherein X is an anion;
- b) bubbling a gas through the waste water to form a foam on the surface of the waste water comprising the gas and at least some of the PFAS component;
- and
- c) removing at least some of the foam off the surface of the waste water, thereby removing at least some of the PFAS component from the waste water to form a lower PFAS component content waste water.
Dependencies are inferred from the claim text.