Electrodeionization EDI systems have become the solution to many applications, with lower operating expenses and fewer maintenance requirements making. Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity. SUEZ’s E-Cell* electrodeionization (EDI) technology. Electrodeionization (EDI) is a water purification system that relies on electricity to remove ionic impurities from water into a concentrate water stream.

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Sensitivity to chlorine EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes. EDI is useful for any application that requires constant and economic removal of water impurities without using dangerous chemical.

In addition, when a diluite stream cleaning was required as result of fouling, product quality was completely recovered. Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production.

Advantages As a substitute for the more traditional ion-exchange process, EDI brings advances in both energy and operating expenses to the high purity water treatment train. New Technologies Conventional water treatment systems rely on chemically-regenerated ion exchange resins to remove dissolved solids. When fed with low TDS feed e.

The water produced has met or exceeded customer high-purity water specifications.

Electrodeionization (EDI) | Water Purification Technology | ELGA LabWater

The positively charged ions flow toward the cathode and are rinsed out in the concentrate stream, and the negatively charged ions flow toward the anode and are rinsed out in another concentrate stream.


Transport through resin bead particle diffusion can be limiting. Its development and use in water purification overcame some of the limitations of ion exchange resin beds, particularly the release of ions as the beds exhaust. Reuse of residual water in food and beverages industry Chemical production Biotechnology Electronics Cosmetic Laboratories Pharmaceutical industry Boiler Feed Water Reduction of ionizable SiO 2 and TOC total organic carbon Since installation EDI units perform quite reliably, providing the customers with high purity production water syste either power plant boiler feed or microchip rinse water.

As the ions go towards the membrane, they can pass through the concentration chamber see figure but they cannot reach the electrode.

Aqueous two-phase system Azeotrope Eutectic. Removal Mechanisms While both ion exchange and EDI use ion exchange resins, the removal mechanisms are quite different.

Introduction to Electrodeionization

Electrodeioniization technology can be used as an alternative to single-use purification cartridges. The main applications of EDI technology, such as that supplied by Ionpure, E-cell and SnowPure, are in electronics, pharmaceuticals and power generation. December Learn how and when to remove this template message. Water Treatment – Old vs. This section is broken down into the following topics: Because they generally consist of ions in solution, electdodeionization are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible.

Leaks have been completely eliminated in some modern module designs. Regenerations of ion exchangers typically takes several hours, require bulk storage and pumping facilities for regenerant chemicals, and usually require a waste neutralization tank.


An anode is setup on the left side of the setup and a cathode is electrodeuonization on the right side of the setup.

Electrodeionization (EDI)

Any ionic species formed from the carbon dioxide gas will lower the outlet resistivity of the water produced by EDI.

Service Sysyem Bed Deionization off-site regenerated rental vessels. Ion-selective membranes allow the positive ions to separate from the water toward the negative electrode and the negative ions toward the positive electrode.

May be registered in one or more countries. You may also be interested in Eliminates expensive and hazardous chemicals used in ion-exchange resin regeneration Reduces energy and operating expenses Reduces elwctrodeionization facility size requirement Helps plants meet ISO requirements.

This page was last edited on 10 Octoberat Ionization is followed by removal through the direct current and the ion exchange membranes.

Electrodeionization EDI is an electrically-driven water treatment technology that uses electricity, ion exchange and resin to remove ionized species from water.

EDI is a process which combines ysstem membrane technology with ion-exchange media to provide a high efficiency demineralization process. Eliminates the need for a second bank of Sysstem membranes and associated plumbing, pumping and control equipment. Purified water flows out through the opposite side of the compartment. Through electro dialysis an electrical potential transports and segregates charged aqueous species.

Only the ions can pass through the membrane, the water is blocked.