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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The resin wafer material enhances mass transfer between solid resin bead and liquid feed solution phases to achieve a high purity, especially when treating impaired or [1] brackish water.

There are also EDI units that are often electrodeionizatjon to as continuous electrodeionization CEDI since the electric current regenerates the resin mass continuously.

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. Purified water flows out through the opposite side of the compartment. One important aspect in the water treatment application is that some eelectrodeionization of EDI needs to have feed water that is free from CO2, as well as other dissolved gasses, since these put unnecessary strain on the EDI unit and will reduce performance.

EDI utilizes chemical-free regeneration. While both ion exchange and EDI use ion exchange resins, the removal mechanisms are quite different.

Electrodeionization (EDI) Systems | E-Cell | SUEZ

Water is passed between an anode positive electrode and a cathode negative electrode. Retrieved from ” https: It also enables you to see the benefits of EDI, understand how to design an EDI system and watchouts during design and operation to maintain your system. Service Mixed Bed Deionization off-site regenerated rental vessels. They are ideal for multiple applications including: Water is fed through the wafer, while an electric current is applied to setup.


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. EDI is useful for any application that requires constant and economic removal of water impurities without using dangerous chemical.

Electrodeionization (EDI)

We’re here to help. When fed with low TDS feed e. RW-EDI process uses a porous ion exchange resin wafer with cm2 cross-section surface area.

December Learn how and when to remove this template message. RW-EDI is a process that targets the desalination of impaired water or water with salt levels of 1, – 10, ppm.

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 electroeionization or microchip rinse water.

Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design. These act as continuous regenerating agents of the ion-exchange resin. Water Treatment – Old vs. Argonne National Laboratory estimates that The chamber contains a ion exchange resin, packed between a cationic exchange membrane and a anionic exchange membrane. EDI has significantly lower operating costs than conventional ion exchange processes.


The polishing of the RO product water is carried out by continuous electrodeionization EDI which is capable of producing water in excess ekectrodeionization 18 megohm resistivity. The ion exchange beds in our EDI systems are regenerated continuously so that they do not exhaust in the same way as ion exchange beds that are operated in batch mode. When flow enters the resin filled diluiting compartment, several processes are set in motion.

High purity water production has traditionally used a combination of membrane separation and ion exchange processes. May be registered in one or more countries. Some of the advantages of the EDI as opposed to the conventional systems of ionic interchange are:. The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration. No acid or caustic bulk storage, pumping, waste neutralization or disposal issues.


This section is broken down into the following topics: The waste regenerants sysetm these systems are usually combined, neutralized and released to the environment. As impurities leave via the concentrate water system, their build-up does not exhaust the resin and therefore prolongs resin lifespan. You may also be interested in An EDI stack has the basic structure of a deionization chamber.