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EDI (Elcctrodei oni zation) is a pure water manufacturing technology that combines ion exchange technology, ion exchange membrane technology and ion electromigration technology. It cleverly combines electrodialysis and ion exchange technology, and uses the high voltage of the two electrodes to move the charged ions in the water, and cooperates with the ion exchange resin and the selective resin film to accelerate the ion removal, thereby achieving the purpose of water purification. During the EDI demineralization process, ions are removed by an ion exchange membrane under the action of an electric field. At the same time, the water molecules generate hydrogen ions and hydroxide ions under the action of an electric field, and these ions continuously regenerate the ion exchange resin to keep the ion exchange resin in an optimal state. The salt removal rate of the EDI facility can be as high as 99% or more. If the reverse osmosis equipment is used to demineralize the water before the EDI, and then the salt is removed by the EDI, the ultrapure water with a high resistivity of 15 MΩ·cm or more can be produced. The EDI stack consists of a number of cells sandwiched between two electrodes. There are two different types of chambers in each unit: a fresh water chamber to be desalted and a concentrated water chamber where impurity ions are removed. The fresh water chamber is filled with a mixed cation and anion exchange resin. These resins are located between the two membranes: a cation exchange membrane that only allows cation permeation and an anion exchange membrane that only allows anion to permeate. The resin bed is continuously regenerated by direct current applied to both ends of the chamber, and the voltage decomposes the water molecules in the influent into H+ and OH-. These ions in the water are attracted by the corresponding electrodes, and pass through the anode and the anion exchange resin to the corresponding membrane. In the direction of migration, when these ions pass through the exchange membrane and enter the concentration chamber, H+ and OH- combine to form water. The generation and migration of such H+ and OH- is the mechanism by which the resin can be continuously regenerated.
The original text was transferred from: Shijiazhuang Hongcheng Environmental Engineering Co., Ltd. http://
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