Since its first commercial introduction over 18 years ago, Electrodeionization (EDI) has grown and matured in popularity. In many applications, the technology can replace mixed ion exchange using a chemical-free process. This produces high-quality water; however, the quality of water fed to the EDI system is reverse osmosis permeate generally. The price of the electrodeionization (EDI) System has reduced over 60 percent in the years as the improved designs, better manufacturing, and competitive nature of the business as its inception. This makes it a competitive one. EDI treatment of water For the same reason essentially that anion and cation units are replaced cost-effectively by RO units. Mixed-bed IX units are replaced cost-effectively in EDI units in many cases. Chemical regeneration by caustic and acid are not required by the resin beads in EDI units. EDI units are electrically regenerated continuously. To provide a channel between them, a spacer is located between each pair of resin sheets. A brine channel is every other channel not filled with anion and cation resin beads. A stack is the total collection of alternating resin beads, spacers, and resin sheets. Combining ion-exchange membranes with ion-exchange resins, Electrodeionization (EDI) done with electrodeionization (EDI) System Taiwan is a hybrid separation process and is also called continuous deionization (CDI). For recovery or removal of ions from water, The EDI gained increasing attention. Giving a brief overview of those studies is the aim of this paper. Very efficient in the recovery of some valuable species, production of ultra-pure water, and environmental protection, the presented examples of applications have shown the EDI process. Normally, to remove via such membrane processes as reverse osmosis and electrodialysis reversal (EDR), weakly-ionized species such as boron and carbon dioxide are tough. The benefit of continuous removal of these species is offered by the EDI offers to a very high degree. The TDS in both purified and initial water, flow velocity in the concentrate and dilute compartments, current strength, and temperature are the main technological parameters determining the efficiency of an EDI module.
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