Faradic Porosity Cell With Asymmetric Electrodes for Ion Removal
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Solution Overview
Problem
Existing water purification technologies are inefficient and costly in removing metal ions, halide ions, and particulates, particularly lead, from water supplies, and they lack specificity and durability, leading to high operational costs and health risks.
Innovation Solution
The development of faradic porosity cells (FPCs), including electro-dehalidation cells (EDCs) and capacitive coagulation cells (CCCs), which utilize faradic reactions and controlled pore mouth diameters to agglutinate target species, enhancing the removal of chlorine, chloramines, and metals below regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional water purification technologies are used to remove metal ions, halide ions, and particulates, then some level of purification is achieved, but the technologies are inefficient and costly with high operational costs
Solution Approach 1:
The patent employs carbon electrodes with specifically engineered pore mouth diameters (0.5-5.0 micrometers) to enhance the removal efficiency of metal ions, halide ions, and particulates. The porous structure increases the surface area and facilitates agglutination of target species, thereby improving purification productivity while reducing operational costs through enhanced mass transfer and reaction efficiency.
Solution Approach 2:
The invention utilizes faradic reactions that change the electrochemical parameters (potential, current density) at the electrode surfaces to agglutinate target species. By controlling the applied potential and resulting pH changes during electrochemical reactions, the system achieves efficient removal of contaminants with lower energy consumption compared to conventional methods.
2Reliability
If conventional purification methods are used, then some contaminants are removed, but specificity is lacking and device durability is reduced
Solution Approach 1:
The carbon electrodes with controlled pore mouth diameters provide both durability and specificity. The porous structure is chemically stable and mechanically robust, ensuring long device life, while the specific pore size distribution enables selective agglutination of target species based on their size and charge characteristics, achieving high purification specificity.
Solution Approach 2:
The system uses composite carbon electrode materials with specific pore structures combined with electrochemical reactions to achieve both durability and specificity. The carbon material provides structural stability and chemical inertness for long-term operation, while the engineered pore architecture and electrochemical properties enable selective removal of specific contaminants.
3Manufacturing precision
If existing technologies are used to remove contaminants, then basic purification is achieved, but the ability to remove contaminants below regulatory limits is insufficient
Solution Approach 1:
The carbon electrodes with precisely controlled pore mouth diameters (0.5-5.0 micrometers) enable high-precision removal of contaminants below regulatory limits. The porous structure provides extensive surface area and controlled mass transfer pathways that facilitate thorough purification, achieving contaminant levels below 15 ppb for lead and other heavy metals.
Solution Approach 2:
The invention replaces complex mechanical filtration systems with electrochemical agglutination processes. By using faradic reactions at carbon electrodes to agglutinate target species, the system achieves high precision contaminant removal without requiring complex mechanical structures, multi-stage filtration systems, or sophisticated control mechanisms.
4Productivity
If standard electrode configurations are used, then basic capacitive adsorption occurs, but faradic reactions are not utilized to enhance removal efficiency
Solution Approach 1:
The system employs carbon electrodes with specific pore mouth diameter parameters (0.5-5.0 micrometers) to optimize faradic reactions. By controlling the electrochemical parameters (applied potential, current density) and pore structure parameters, the invention enhances contaminant removal rates through agglutination mechanisms while maintaining relatively simple electrode configurations.
Solution Approach 2:
The porous carbon electrode structure with controlled pore mouth diameters facilitates faradic reactions by increasing the electrochemically active surface area and improving mass transfer. The porous architecture enables efficient electron transfer and agglutination of target species, significantly enhancing removal productivity without requiring complex electrode designs.
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
FPCs provide efficient, cost-effective, and scalable water purification, effectively reducing metal and halide contaminants to safe levels, outperforming conventional methods and extending device lifetimes.
Implementation Method 1
pairing selected faradic reactions with carbon electrode pore mouth diameter profiling
Implementation Method 2
capacitive adsorption to remove metal ions, derivatives of metals, or particulate metal from a liquid
Implementation Method 3
Adsorption means attracting ions in an input stream to and retaining those ions on an electrode surface
Implementation Method 4
capacitive adsorption means adsorption of an ion or other charged species on an electrode as a result of electrical attraction
Implementation Method 5
electrochemical pH modulation & metal immobilization
Implementation Method 6
precipitation
Data Source
AI summary
The present invention is directed to an electrochemical device for at least partially removing or reducing a target ionic species from an aqueous solution using faradaic immobilization, the electrochemical device including at least one first electrode and at least one second electrode with different void fraction and surface area properties, due to differences in void fraction (also referred to as void ratio) of the at least one first and the at least one second electrode, water flows through an electrode with a high porosity, while the aqueous solution does not flow through an electrode with a low porosity. The asymmetry of the electrodes provides a desired voltage distribution across the device, which equates to a different voltage at each electrode, to control the speciation of the target ionic species at the anode and the cathode.