EDI MODULE – Electrodeionization Module .

(Electrodeionization) EDI systems

Deionization, also known as demineralization, is the process of removing mineral (inorganic) ions (cations and anions) from water and exchanging them with hydrogen (H +) and hydroxide (OH -) to produce a high purity water that is similar to distilled water.

Electrodeionization (EDI) is the process that removes ions from liquids using electrically active media and an electrical potential to affect ion transport. It differs from conventional deionization process in that it does not require the use of acid, base, or other chemicals. EDI is commonly used as a polishing process to further deionize reverse osmosis product water to near zero conductivity quality water.

EDI systems use semi-permeable anion and cation ion exchange membranes. An external power source applies a transverse DC electrical field using electrodes at the ends of the compartment array. This electric field attracts ions in the liquid and their respective counter electrodes. The result is that the compartments bounded by the anion membrane facing the anode and the cation membrane and facing the cathode become depleted of ions.

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