Desalination Battery Cell With Reversible Ion Transport Control
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Solution Overview
Problem
Current desalination technologies face challenges such as high energy demands, environmental concerns, membrane corrosion, and limited scalability due to issues like fouling and high operating costs, which hinder the widespread use of fresh water production from seawater.
Innovation Solution
A desalination battery cell system utilizing anion exchange membranes and intercalation host electrodes, with a controller to manage electric current and ion transport, effectively separates salt from seawater, producing desalinated water and a brine stream, and can be configured in series, parallel, or cascade arrangements to optimize water production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional desalination processes (multi-stage flash distillation, reverse osmosis) are used, then salt removal efficiency is improved, but energy consumption increases significantly
Solution Approach 1:
The desalination process is divided into multiple compartments separated by alternating cation-exchange membranes and anion-exchange membranes, creating sequential stages where ions are progressively removed. This segmentation allows the system to achieve high salt removal efficiency through cumulative effect across compartments while reducing energy demand per stage compared to conventional single-stage high-pressure systems.
Solution Approach 2:
The system employs periodic reversal of electrical potential to alternate the direction of ion migration between compartments. During each cycle, ions are driven toward collection compartments, then reversed and driven back, enabling continuous desalination without requiring sustained high energy input. This periodic action maintains efficiency while reducing overall energy consumption.
2Measurement precision
If membrane-based desalination is used, then desalination effectiveness is improved, but membrane corrosion and fouling occur
Solution Approach 1:
Ion-exchange membranes serve as intermediary selective barriers that facilitate ion transport through electrochemical mechanisms rather than purely physical pressure-driven processes. These membranes are specifically designed to be resistant to corrosion from saline environments while maintaining high selectivity for salt removal, thus improving both effectiveness and durability simultaneously.
Solution Approach 2:
The system operates by changing the electrical potential parameter periodically, which alters the driving force for ion transport without requiring extreme pressure conditions that would accelerate membrane degradation. This parameter change approach maintains high desalination effectiveness while operating under milder physical conditions that preserve membrane integrity and reduce fouling.
3Productivity
If large-scale desalination plants are built, then fresh water production increases, but operating costs and environmental impact increase
Solution Approach 1:
The system incorporates compartments dedicated to collecting and concentrating brine, which can then be processed or disposed of more efficiently. This self-service approach to waste management reduces the environmental burden of brine discharge while maintaining high fresh water production capacity. The concentrated brine stream is easier to manage and can potentially be used for other purposes, reducing overall environmental impact.
Solution Approach 2:
The system separates and concentrates dissolved solids into a smaller volume of brine that can be more easily disposed of or reused. By discarding the concentrated waste stream in a controlled manner rather than dispersing it, the system reduces environmental impact while maintaining high productivity. The recovered fresh water from each compartment can be collected and used, maximizing resource efficiency.
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
The system efficiently reduces salt concentrations in seawater, offering a scalable and cost-effective solution for producing fresh water while minimizing environmental impact and operational costs.
Implementation Method 1
a first compartment separated by an anion exchange membrane from a second compartment
Implementation Method 2
a voltage source configured to supply electric current to the first and second intercalation host electrodes to release cations into the solution
Implementation Method 3
a controller programmed to adjust an amount of the electric current being supplied to change direction of anions, present in the solution, passing through the anion exchange membrane
Data Source
AI summary
A desalination battery cell includes a first compartment separated by an anion exchange membrane from a second compartment, each of the first and second compartments containing a saline water solution having a concentration of dissolved salts c1 and first and second intercalation host electrodes, respectively, in fluid communication with the solution, a voltage source supplying electric current to the first and second intercalation host electrodes to release cations into the solution, and a controller programmed to adjust an amount of the electric current being supplied to change direction of anions in the solution passing through the anion exchange membrane between the compartments such that the first and second compartments alternately collect and disperse salt from the solution and release desalinated water solution having a concentration c2 of dissolved salts and a brine solution having a concentration c3 of dissolved salts such that c3>C1>C2.