Electrodeionization (EDI)
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What is EDI?
Electrodeionization or EDI, is a continuous and chemical-free process of removing ionized and ionizable species from feed water using DC power. EDI is typically used to polish reverse osmosis (RO) permeate and to replace conventional mixed bed ion exchangers by eliminating the need to store and handle hazardous chemicals that are used for resin regeneration and the associated waste neutralization requirements.
The patented DOW™ EDI module utilizes a spiral wound membrane (see figure 1) and ion exchange resins, sealed in a high strength FRP pressure vessel. DOW™ EDI optimizes performance and maintains continuous product quality and can produce 18+ MΩ-cm high-purity water with high silica and boron rejection. DOW™ EDI is the first truly cost effective and environmentally friendly alternative to post-RO deionization applications.
Figure 1 |
®™* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow
