Regeneratable Carbon 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 unsustainable, requiring frequent replacement and disposal of contaminated materials.
Innovation Solution
A method involving a carbon bed that captures ionic contaminants, followed by treatment with hydroxides, peroxides, and specific cations to form an aggregate contaminant phase, which can then be isolated and removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ion exchange resin or carbon bed is used to trap contaminants, then contaminant removal is achieved, but the bed requires replacement and disposal to landfill
Solution Approach 1:
The patent recovers contaminants from the carbon bed by eluting them with a regenerant solution, allowing the carbon bed to be reused. Instead of discarding the spent carbon bed to landfill, the contaminants are recovered and concentrated in the eluate for further treatment or disposal, while the carbon bed is regenerated and returned to service.
Solution Approach 2:
The patent extracts contaminants from the carbon bed through elution with a regenerant solution. The contaminants are taken out of the carbon bed structure and transferred to the eluate liquid phase, enabling separation and further processing of the contaminants while leaving the carbon bed clean and ready for reuse.
2Reliability
If carbon bed is replaced frequently, then contaminant removal efficiency is maintained, but system cost increases
Solution Approach 1:
The patent recovers contaminants from the carbon bed through elution, allowing the carbon bed to be regenerated and reused multiple times. This recovery process extends the operational life of the carbon bed, reducing the frequency of replacements and lowering system operational costs while maintaining contaminant removal efficiency.
Solution Approach 2:
The patent enables continuous operation by regenerating the carbon bed in-situ, allowing it to return to its contaminant-removal function without replacement. The system can alternate between service mode (contaminant removal) and regeneration mode, ensuring continuous useful action with reduced material consumption.
3Productivity
If carbon bed is used continuously, then operational cost is reduced, but contaminant accumulation occurs
Solution Approach 1:
The patent maintains continuous operational capability by implementing in-situ regeneration. The carbon bed can be regenerated while remaining in the system, allowing it to return to full contaminant removal capability without interruption. This enables continuous useful action while preventing permanent contaminant accumulation.
Solution Approach 2:
The patent employs a feedback mechanism where the carbon bed's contaminant loading is monitored and addressed through periodic regeneration. The regenerant solution is introduced to reverse the adsorption process, and the system transitions between service and regeneration modes based on contaminant accumulation levels, maintaining optimal 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
This method effectively regenerates the carbon bed, allowing for repeated use without the need for costly replacements or environmentally harmful disposal, while enhancing contaminant removal efficiency.
Implementation Method 1
flowing a contaminated aqueous mixture comprising one or more ionic contaminants through a vessel that houses a carbon bed, wherein the one or more ionic contaminants are retained by the carbon bed
Implementation Method 2
contacting the one or more ionic contaminants retained by the carbon bed with (a) a hydroxide and/or a peroxide
Implementation Method 3
contacting the one or more ionic contaminants retained by the carbon bed with (b) one or more cations selected from Ca2+, Mg2+, Zn2+, Sr2+, Al3+, B3+, and Fe3+
Implementation Method 4
forming an aggregate contaminant phase comprising the one or more ionic contaminants and isolating the aggregate contaminant phase
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 optionally an electrode in electrical contact with the bed with a power source for applying a voltage to the electrode. 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. The capture bed may be treated with a hydroxide and/or a peroxide, e.g., prior to the counter ion binding the contaminant.