Electrodialysis Deionization Battery Cell Segmentation
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Solution Overview
Problem
Current desalination technologies face challenges such as high energy demands, environmental concerns, and material issues related to corrosion and fouling of membranes, limiting their widespread use for producing fresh water from saline sources.
Innovation Solution
The development of a deionization battery cell that includes intercalation host electrodes and an ion exchange membrane assembly with alternating anion and cation exchange membranes, separated by water stream compartments, which uses electric current to separate ions from saline water, producing fresh water and a concentrated brine stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional desalination processes are used, then water can be desalinated, but high energy demands are required
Solution Approach 1:
The device is segmented into multiple compartments separated by alternating cation-exchange membranes and anion-exchange membranes, creating a series of chambers that process water in stages. This segmentation allows for progressive ion removal while distributing energy consumption across multiple smaller units rather than requiring high energy in a single stage, thereby reducing overall energy demand while maintaining productivity.
Solution Approach 2:
The electrodialysis process operates through periodic application of electric current to drive ion migration across membranes. By applying electric potential periodically and reversing polarity in alternating chambers, the system efficiently removes ions through controlled periodic action rather than continuous high-energy input, reducing energy demand while sustaining desalination productivity.
2Object-affected harmful factors
If conventional desalination processes are used, then water can be desalinated, but environmental concerns arise
Solution Approach 1:
The system converts the harmful effect of concentrated brine waste into a beneficial byproduct stream that can be separately managed and potentially reused. By efficiently concentrating salts in specific chambers through electrodialysis, the process transforms what would be dispersed environmental pollution into a concentrated stream suitable for industrial reuse or controlled disposal, reducing environmental impact while maintaining high desalination productivity.
Solution Approach 2:
The process separates and recovers valuable components from the water stream while discarding only the necessary minimal waste. Through selective ion removal via ion-exchange membranes, the system recovers fresh water as the primary product and concentrates salts in a manageable brine stream, minimizing environmental discharge requirements and enabling sustainable desalination operations.
3Reliability
If conventional membranes are used in desalination, then ion separation can be achieved, but material issues related to corrosion and fouling occur
Solution Approach 1:
The system employs composite membrane structures combining ion-exchange resins with supportive polymer matrices, creating materials that resist corrosion and fouling. These composite membranes integrate the selective ion transport properties of ion-exchange materials with the mechanical strength and chemical stability of polymer supports, enhancing reliability and reducing maintenance requirements while maintaining ease of manufacture through established polymer processing techniques.
Solution Approach 2:
The membranes are designed with optimized parameters including cross-linking density, pore size distribution, and functional group composition to resist corrosion and fouling. By adjusting these parameters during manufacturing, the membranes achieve enhanced chemical stability and anti-fouling properties, extending service life and reducing maintenance frequency without complicating the manufacturing process.
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 solution effectively reduces the energy requirements for desalination, minimizes environmental impact, and extends the lifespan of membrane components by using a dual-ion electrochemical deionization process, thereby enhancing the efficiency and sustainability of water desalination.
Implementation Method 1
an ion exchange membrane assembly including a plurality of anion exchange membranes separated from each other, and from one or more cation exchange membranes positioned between the anion exchange membranes
Implementation Method 2
dual-ion electrochemical deionization process
Data Source
AI summary
A deionization battery cell including a first electrode compartment containing a first intercalation host electrode and includes a first water stream compartment in fluid communication with the first electrode compartment. The deionization battery cell further includes a second electrode compartment containing a second intercalation host electrode and a second water stream compartment in fluid communication with the second electrode compartment. The deionization battery cell also includes an ion exchange membrane assembly including a plurality of anion exchange membranes separated from each other, and from one or more cation exchange membranes positioned between the anion exchange membranes, by a plurality of intervening water stream compartments. The first and second water stream compartments are separated from one another by the ion exchange membrane assembly.