Use of Modeling Software Predicting EDI Performance in Process Applications

By Azita Yazdani, P.E., and Jos´┐Ż Chavez

CONDUCTIVITY DEIONIZATION EDI ION EXCHANGE

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Abstract

Electrodionization (EDI) is a water deionization process that combines ion-exchange resins and ion-exchange membranes. EDI technologies have been widely accepted as competitive technologies for the production of high-purity water. This technology is capable of deionizing water with a low volume concentrate stream. One advantage is that EDI does not require use of chemical reagents for regeneration. As such, EDI has become a viable technology for the recovery of heavy metal ion-containing waste streams. This article will review on a pilot test of EDI technology to treat water at a metal plating facility. The EDI equipmenta used included a modeling softwareb to provide modeling data for the modules. The modules are industrial-quality EDI modules used for producing high-purity water. They are configured to easily retrofit into existing systems, and use a non-scaling electrode system, and thin cells. The EDI system design software and performance estimate software was developed to provide original equipment manufacturers with a tool to design a reverse osmosis (RO) EDI system, and to predict system performance. The EDI projection software allows for sizing of the treatment system, comparing EDI pretreatment to specifications, offering system improvement suggestions, and warning against possible problems with project performance.

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