Core Principle of Electrodialysis
The core of electrodialysis technology lies in the combination of electric field and selective membrane technology, with the specific principle divided into two parts:
1. Driving effect of DC electric field
Under the action of a DC electric field, anions and cations in the solution move directionally: cations migrate toward the negative electrode, while anions migrate toward the positive electrode.
2. Selective sieving effect of ion exchange membranes
Two types of ion exchange membranes are used in the system to achieve ion separation:
Cation exchange membrane: Only allows cations (e.g., Na+, Ca2+, Mg2+) to pass through, while blocking anions.
Anion exchange membrane: Only allows anions (e.g., Cl-, SO42-) to pass through, while blocking cations.
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