【Introduction】

     EDI （Electrodeionization）is also called continuous power desalination technology, is a traditional mixed-bed ion exchange process to replace the best technology that scientifically the electrodialysis and ion exchange technology integration, through positive, anion membrane on the sun, through the choice of anion Role in water and ion exchange resin ion exchange, the role of the electric field to achieve the directional migration of ions in water, So as to achieve the depth of the water purification desalination, and produced by water electrolysis hydrogen ions and hydroxide ions on the resin filled with continuous regeneration, so the process of EDI system water without acid and alkaline chemicals can be continuously recycled over the production of high quality Pure water, it has advanced technology, compact structure, the advantages of easy operation, water treatment technology is the green revolution。

 【Word Principle】

 EDI technology is the use of ion exchange resin ion exchange and anion-exchange membrane to the anions and cations through the selective role in the electric field under the effect of directional migration to achieve ion, thus completing the depth of water desalination. Because ion exchange, ion mobility and ion exchange resin regeneration accompanied by electric occur as a side edge of the exchange mixture of ion exchange resin regeneration column, you can continuously produce highly purified water, so the process is also known as continuous deionization。EDI module will be fully caught in the ion exchange resin anion / cation exchange membrane between the EDI unit. EDI will be a certain number of EDI modules between elements separated by lattice panels to form dense water chamber and water chamber。 And both ends of the unit group yin / yang electrodes。Driven in DC，Fresh water flow through the chamber in the ions through the anion exchange membrane, respectively, to the dense water into the chamber room in the fresh water to remove。Concentration of the water chamber through the ion out of the water system, a concentrated water. EDI devices generally reverse osmosis (RO) water as the EDI feed water。RO water resistance is generally 40-2μS/cm (25 ℃). EDI water resistance up to 18 MΩ.cm (25 ℃), but according to de-ionized water use and system configuration settings, EDI Ultra-pure water required for preparation of resistivity in the 1-18.2MΩ.cm (25 ℃) of pure Water。