GE EDI技术文件.pdf

Technical Paper Application of Electrodeionization in Ultrapure Water Production: Performance and Theory Authors: Brian P. Hernon, R. Hilda Zanapalidou, Li ion-exchange resin. When EDI is used for the pro- Zhang, Linda R. Siwak, and Erik J. Shoepke, Ionics duction of high purity water, the ion-exchange resin beads enhance mass transfer, facilitate water Presented at the 55th Annual Meeting International splitting, and reduce stack resistance. The ion- Water Conference Pittsburgh, PA, Oct. exchange resin exchanges ions with the incoming 30-Nov. 2, 1994 feed stream. The DC electrical field splits water into Note: GE Water Process Technologies purchased hydrogen and hydroxyl ions, which, in turn, con- Ionics in 2005. tinuously regenerate the ion-exchange resins. The exchanged ions are transferred through the mem- Introduction branes to the brine stream and flushed from the system.1,2 Compared to conventional ion exchange, Ultrapure water is critical in a number of industrial EDI has the advantage of