Capacitive Deionization Electrode Regeneration via Periodic Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of releasing adsorbed ionic substances from electrodes in capacitive deionization (CDI) technology is limited, affecting the overall performance of water purification treatments.
Innovation Solution
A water treatment device and method that includes electrode units for adsorption/desorption, a treatment tank, circulation pipeline, and a switching unit to alternate between purification and washing steps based on water quality and electric states, optimizing the release of ionic substances through controlled voltage application and short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DC voltage is applied to collector electrodes for continuous purification, then water quality improvement is achieved, but the efficiency of releasing adsorbed ionic substances from electrodes deteriorates
Solution Approach 1:
The invention applies periodic switching between purification mode (DC voltage applied) and washing mode (DC voltage reversed or short-circuited) to electrode units. This periodic action allows the system to alternate between adsorbing ionic substances from water and releasing them for regeneration, thereby maintaining both high water quality and efficient ion release capability without continuous operation in one mode
2Productivity
If washing treatment is performed continuously to release ionic substances, then electrode regeneration is improved, but water purification performance deteriorates
Solution Approach 1:
The system periodically switches between purification mode where DC voltage is applied for water treatment and washing mode where voltage is reversed or short-circuited for electrode regeneration. This time-division multiplexing ensures that water purification and electrode washing do not occur simultaneously, preventing deterioration of purification performance during regeneration cycles
Solution Approach 2:
The invention dynamically adjusts the operational state of electrode units by controlling the switching between purification and washing modes based on real-time monitoring of water quality and electrode status. This dynamic control optimizes the balance between maintaining water quality and regenerating electrodes, allowing the system to adapt to varying operational conditions
3Productivity
If multiple electrode units are used to improve purification capacity, then water treatment effectiveness is enhanced, but system complexity increases
Solution Approach 1:
The invention divides the water treatment system into multiple independent electrode units that can be individually controlled and switched between purification and washing modes. This segmentation allows parallel operation of multiple units, increasing overall purification capacity while maintaining manageable complexity through modular design and independent control of each unit
Solution Approach 2:
Each electrode unit is designed to perform multiple functions: water purification during purification mode and self-regeneration during washing mode. This multi-functionality reduces the need for separate dedicated regeneration systems, thereby increasing purification capacity without proportionally increasing system complexity
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
Improves the efficiency of releasing adsorbed ionic substances, enhancing the removal performance and maintaining water quality by restricting washing treatment to necessary periods and using treated water for efficient desorption.
Implementation Method 1
A capacitive deionization (CDI) technology using an electrical double layer capacitor technology is a method for removing an ionic substance from an aqueous solution to be treated, by using a Coulomb force
Implementation Method 2
A capacitive deionization (CDI) technology using an electrical double layer capacitor technology
Data Source
AI summary
This water treatment device includes: electrode units for performing adsorption/desorption of the impurity; a treatment tank having the electrode units disposed in an inside of the treatment tank; an upstream part for guiding the water into the inside; a downstream part for guiding the water so as to be discharged, the water having been subjected to the adsorption/desorption performed by the electrode units; a circulation pipeline, the circulation pipeline being for guiding water having been guided by the downstream part, to the upstream part; and a switching unit for switching between, on the basis of at least one of a water quality of the water having been guided to the downstream part or an electric state of the treatment tank, guiding the water having been guided by the downstream part, so as to be discharged, and guiding the water to the circulation pipeline.