The electrodialysis process is a combination of electrochemical and diffusion processes; Driven by an external DC electric field, utilizing the selective permeability of the ion exchange membrane (i.e., cations can pass through the cation exchange membrane, and anions can pass through the anion exchange membrane), the anions and cations move towards the anode and cathode respectively. During ion migration, if the fixed charge of the membrane is opposite to the charge of the ion, the ion can pass through; If their charges are the same, the ions are repelled, achieving the purposes of solution dilution, concentration, refinement, or purification
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