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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It will also better prepare you for the content in the Intermediate EDI section.

Electrodeionization (EDI) – Samco Tech

December Learn how and when to remove this template message. Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible.

Each cell consists of an electrode and an electrodeionizatipn with ions that undergo either oxidation or reduction. Since installation EDI units perform quite reliably, providing the customers with high purity production water for either power plant boiler feed or microchip rinse water.

Regenerations of ion exchangers typically takes several hours, require bulk storage and pumping facilities for regenerant chemicals, and usually require a waste neutralization tank. There are also EDI units that are often referred to as continuous electrodeionization CEDI since electtrodeionization electric current regenerates the resin mass continuously.

Service Mixed Bed Deionization off-site regenerated rental vessels.

EDI modules can be sized to operate from a fraction of a gpm up to about 50 gpm. 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.


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 for either power plant boiler feed or microchip rinse water.


Any ionic species formed from the carbon dioxide gas will lower the outlet resistivity of the water produced by EDI. In addition, when a diluite stream cleaning was required as result of fouling, product quality was completely recovered.

Under the influence of the strong direct current field applied across the stack of components, charged ions are pulled off the resin and drawn towards the respective, oppositely-charged electrodes. The ion exchange systems are usually supplied in duplicate, to allow one system to provide water while the other one is being regenerated.

This article relies too much on references to primary sources. You may also be interested in This technology can be used as an alternative to single-use purification cartridges. Sensitivity to chlorine EDI is just as sensitive to the elecyrodeionization as thin-film reverse osmosis RO processes. Eliminates the need for a second bank of RO membranes and associated plumbing, pumping and control equipment.

This section is broken down into the following topics:. EDI provides a high quality water, low in particles, partiall due to the fact that there is no resin attrition from backwashing or osmotic shock, as would be the case with conventional ion exchange processes. Most EDI devices have sstem 1 ppm hardness limit which is easily addressed with proper pretreatment system design. The ion syxtem resins act to retain the ions, allowing these to be transported across the ion exchange membranes.

The positively charged ions flow toward the cathode and are rinsed out in the concentrate stream, and the negatively charged ions flow toward the electrodeiohization and are rinsed out in another concentrate stream. High purity deionized water results.

Electrodeionization | Water Solutions

EDI is useful for any application that requires constant and economic removal of water impurities without using dangerous chemical. Advantages As a substitute for the more electrodeionizatjon ion-exchange process, EDI brings advances in both energy and operating expenses to the high purity water treatment train.


In this way these charged strong-ion species are continuously removed and transferred in to the adiacent concentrating compartments. The strong, applied electrical potential splits water at the surface of the resin beads, electrodeioniization hydrogen and hydroxyl ions.

Conventional water treatment systems rely on chemically-regenerated ion exchange resins to remove dissolved solids.

The ion exchange beds in our EDI systems are regenerated continuously so that they do not exhaust in the same electrodwionization as ion exchange beds that are operated in batch mode. Converting seawater to high purity water at Spain power plant Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production.

Electrodeionization (EDI)

No ionic breakthrough resulting in a constant high quality of water. Recently, Argonne National Laboratory developed a process called Resin-Wafer Electrodeionization RW-EDIwhich uses a unique porous resin wafer electrodeionizattion made from immobilized loose ion-exchange resin beads.

They are ideal for multiple applications including: The waste regenerants from these systems are usually combined, neutralized and released to the environment. Removal Mechanisms While both ion exchange and EDI use ion exchange resins, the removal mechanisms are quite different. They are sometimes referred to in abbreviated jargon as lytes. Strong ions are scavenged out of the feed stream by the mixed bed resins. EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes.

They are blocked by the contiguous membrane, that contains a resin with the same charge.