Anionic Membrane Cationic Coating PFAS Removal
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Solution Overview
Problem
Current technologies face challenges in effectively removing poly- and perfluoroalkyl fluorinated materials (PFAS) from aqueous masses, as they are highly persistent and can contaminate environments.
Innovation Solution
A system comprising a first chamber with an aqueous mass containing PFAS, an anode and cathode in electronic connection, and an anionic semipermeable membrane or porous support with a cationic compound adhered to it, positioned between the aqueous mass and the anode to attract and retain PFAS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional removal technologies are used, then the system structure remains simple, but the removal efficiency of PFAS is insufficient
Solution Approach 1:
The patent employs a composite membrane structure consisting of an anionic semipermeable membrane combined with a cationic compound coating. This composite material approach enhances PFAS removal efficiency by creating synergistic effects between the membrane's selective permeability and the cationic compound's electrostatic attraction, while maintaining a relatively simple overall system architecture.
Solution Approach 2:
The cationic compound acts as an intermediary substance that facilitates PFAS removal. It is applied to the anionic semipermeable membrane to enhance its PFAS attraction capability through electrostatic interactions, serving as a mediating layer that improves removal efficiency without fundamentally altering the core membrane structure.
2Reliability
If anionic semipermeable membrane is used, then PFAS retention is improved, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes an anionic semipermeable membrane with a porous structure that allows selective passage of ions while retaining PFAS. The porous configuration provides surface area for electrostatic interactions with the cationic compound, enhancing retention capability while maintaining manufacturability through established porous material fabrication techniques.
Solution Approach 2:
The patent modifies the membrane's surface properties by applying a cationic compound coating, changing the electrostatic parameters of the membrane surface. This parameter modification enhances PFAS attraction without requiring fundamental changes to the membrane's base structure, simplifying the manufacturing process while improving retention performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves efficient removal of PFAS from the aqueous mass, with the anionic semipermeable membrane retaining the PFAS effectively, thereby reducing contamination levels.
Implementation Method 1
an anionic poly- and/or perfluoroalkyl fluorinated material attractant and/or a semipermeable membrane or porous attracting or binding support for the poly- and/or perfluoroalkyl fluorinated material attractant between the aqueous mass and the anode
Implementation Method 2
an anionic semipermeable membrane or porous support with a cationic compound adhered to it, positioned between the aqueous mass and the anode to attract and retain PFAS
Data Source
AI summary
A system and method for the removal of poly- and/or perfluoroalkyl fluorinated materials contaminants from an aqueous mass uses a system which includes:a) a first chamber for holding the aqueous mass containing a detectable amount of poly- and/or perfluoroalkyl fluorinated materials;b) an anode and a cathode in electronic connection with the aqueous mass in the first chamber; andc) an anionic semipermeable membrane or porous structure between the aqueous mass and the anode.The anionic semipermeable membrane comprises at least 0.0001% by total weight of the anionic semipermeable membrane of a cationic compound adhered to the anionic semipermeable membrane.