Aqueous Electrostatic Concentrator for PFAS Removal
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Solution Overview
Problem
Conventional methods for removing PFAS from water are ineffective due to the stability of carbon-fluorine bonds, leading to incomplete regeneration of anion exchange resins and increased toxic waste disposal costs, with existing technologies failing to optimize resin capacity and reclaim spent regenerant solutions.
Innovation Solution
The Aqueous Electrostatic Concentrator (AEC) system uses a three-chamber setup with semipermeable membranes and electrodes to drive highly fluorinated alkyl materials across membranes, reducing PFAS concentrations from contaminated aqueous feed liquids to below 10 parts per billion, utilizing electrostatic principles to concentrate and separate PFAS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anion exchange resin is used to remove PFAS from water, then PFAS removal is achieved, but the resin becomes saturated and requires regeneration using toxic regenerant solutions
Solution Approach 1:
The patent extracts and removes PFAS from the water stream using anion exchange resin, separating the contaminant from the treatment medium. The saturated resin is then regenerated by flushing with a regenerant solution that reverses the adsorption process, allowing the resin to capture PFAS again. This extraction and regeneration cycle resolves the contradiction by enabling continuous PFAS removal while managing the toxic waste through controlled regeneration.
Solution Approach 2:
The patent recovers and reuses the anion exchange resin after it becomes saturated with PFAS. By regenerating the resin through flushing with regenerant solution, the system recovers the resin's capacity to remove PFAS, eliminating the need to discard it as waste. This recovery process addresses the contradiction by maintaining PFAS removal effectiveness while reducing the volume and toxicity of waste requiring disposal.
2Reliability
If conventional methods are used to regenerate anion exchange resin, then resin capacity is restored, but large volumes of toxic waste are generated
Solution Approach 1:
The patent changes the chemical parameters of the regenerant solution to optimize the regeneration process. By adjusting the concentration, pH, and flow rate of the regenerant solution, the system achieves effective resin regeneration with minimized waste generation. This parameter optimization resolves the contradiction by restoring resin capacity while reducing the volume and toxicity of waste products.
3Reliability
If conventional treatment systems are used, then PFAS removal is attempted, but treatment effectiveness is insufficient due to stable carbon-fluorine bonds
Solution Approach 1:
The patent replaces conventional chemical treatment methods with a physical adsorption process using anion exchange resin. Instead of attempting to break the stable carbon-fluorine bonds chemically, the system uses the resin's electrostatic attraction to capture and concentrate PFAS molecules, effectively removing them from water without compromising bond stability. This substitution resolves the contradiction by achieving PFAS removal through a mechanism that does not rely on breaking resilient chemical bonds.
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 AEC system achieves significant PFAS concentration reduction, enabling efficient treatment of PFAS in industrial wastewaters and contaminated groundwater, reducing treatment costs and toxic waste generation by leveraging electrostatic separation principles.
Implementation Method 1
The Aqueous Electrostatic Concentrator (AEC) system uses a three-chamber setup with semipermeable membranes and electrodes to drive highly fluorinated alkyl materials across membranes, reducing PFAS concentrations from contaminated aqueous feed liquids to below 10 parts per billion, utilizing electrostatic principles to concentrate and separate PFAS.
Implementation Method 2
applying a current between the anodic electrode chamber and the cathodic electrode chamber and across the feed chamber from a first electrode in the anodic electrode chamber to a second electrode in the cathodic electrode chamber; the current driving at least highly fluorinated alkyl materials from the feed liquid into and through the semipermeable membrane
Data Source
AI summary
A method of moderating concentration of at least highly fluorinated alkyl materials from a contaminated aqueous feed liquid containing an original composition of between 60 parts per trillion and 300 parts per billion of the at least highly fluorinated materials per liter of water into an aqueous electronic separator having at least three chambers including a feed chamber having a liquid exit port from which a mediated aqueous contaminated feed liquid exits and a liquid input port into which the contaminated aqueous feed liquid enters the feed chamber; an anodic electrode chamber filled with an aqueous anodic liquid; and a cathodic electrode chamber filled with an aqueous cathodic liquid; wherein the feed chamber is between and adjacent to the anodic electrode chamber and the cathodic electrode chamber and the feed chamber is separated from each of the anodic electrode chamber and the cathodic electrode chamber by at least one semipermeable membrane.