Electrochemical Regeneration of Capture Bed for PFAS Removal
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Solution Overview
Problem
Existing water purification technologies for removing ionic contaminants like PFAS are inefficient and environmentally harmful due to the need for frequent replacement and disposal of ion exchange resin or carbon beds.
Innovation Solution
A system and method involving a capture bed with an electrode, where a voltage is applied to bind and release ionic contaminants, using an aqueous wash liquid with counter ions to form an aggregate phase that can be removed, allowing for regeneration and reuse of the capture bed without replacing it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange resin or carbon bed is used to trap contaminants, then contaminant removal is achieved, but the bed requires frequent replacement and disposal to landfill
Solution Approach 1:
The patent implements a regeneration process that recovers the capture bed material by removing accumulated contaminants through electrochemical means. The bed is treated with electrolyte solution and electrical current to desorb and remove contaminants, allowing the bed to be reused multiple times without disposal to landfill.
Solution Approach 2:
The patent replaces the mechanical/chemical adsorption mechanism with an electrochemical mechanism. Electrical current is applied to the capture bed to facilitate contaminant removal through electrochemical reactions, enabling regeneration without replacing the bed material.
2Reliability
If the capture bed is replaced frequently, then contaminant removal effectiveness is maintained, but operational efficiency decreases and costs increase
Solution Approach 1:
Instead of discarding the capture bed after single use, the patent recovers it through electrochemical regeneration. The bed is treated with electrolyte and electrical current to remove contaminants, restoring its contaminant trapping capability for continued operation.
Solution Approach 2:
The patent enables continuous operation by regenerating the capture bed in-situ, allowing the same bed material to serve multiple cycles of contaminant removal without replacement, thereby maintaining continuous useful action.
3Object-affected harmful factors
If the capture bed is disposed of to landfill, then environmental harm is reduced, but environmental sustainability deteriorates
Solution Approach 1:
The patent recovers the capture bed material through electrochemical regeneration, preventing its disposal to landfill. The bed is treated with electrolyte solution and electrical current to remove contaminants, allowing reuse and eliminating the need for environmentally harmful disposal.
Solution Approach 2:
The patent converts the harmful accumulation of contaminants in the bed into a beneficial regeneration process. Electrical current and electrolyte treatment transform the contaminated bed into a reusable asset, converting what would be waste into a sustainable resource.
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
Enables efficient and sustainable removal and regeneration of ionic contaminants, reducing the need for frequent replacement and disposal of capture bed materials, thus improving environmental sustainability and operational efficiency.
Implementation Method 1
applying a voltage to the electrode that is in electrical contact with the capture bed, such that the one or more ionic contaminants is bound to the capture bed
Implementation Method 2
The aqueous wash liquid may contain a counter ion that binds to the ionic contaminant forming an aggregate contaminant phase that can be removed from the aqueous wash liquid
Data Source
AI summary
A system and method for water purification by capture of contaminants in an aqueous mixture is described herein. A system and method for regenerating the capture system is also described. An integrated capture and regeneration system and method is also described including a separation vessel that houses a capture bed and an electrode in electrical contact with the bed and a power source for applying a voltage to the electrode. The applied voltage enhances capture of the contaminant from aqueous liquid on the capture bed and modulation of the applied voltage enhances release of contaminant on the capture bed into aqueous wash liquid to regenerate the bed. The aqueous wash liquid may contain a counter ion that binds to the contaminant forming an aggregate contaminant phase that separates from the aqueous wash liquid.