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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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sustem The resin-wafer technology increases the energy efficiency of electrodeionizatioon desalination process significantly, especially when testing impaired water.

This article relies too much on references to primary sources. EDI is useful for any application that requires constant and economic removal of water impurities without using dangerous chemical. By using this site, you agree to the Terms of Use and Privacy Policy. Duplexing of large Elfctrodeionization systems is not required, because a single EDI module may be taken off line for maintenance or repair while the remaining modules operate at a slight increase in flow rate to maintain the required flow through the system.

RO systems do not require chemical regeneration and also remove many types of total organic carbon TOC which will pass through ion exchange resins.

Electrodeionization (EDI) Systems | E-Cell | SUEZ

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. The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration. In addition, when a diluite stream cleaning was required as result of fouling, product quality was completely recovered.

An anode is setup on the left side of the setup and a cathode is setup on the right side of the setup. Strong ions are scavenged out of the feed stream by the mixed bed resins.

Simple and continuous operation Chemicals for regeneration completely eliminated Cost effective operation and maintenance Low power consumption Non pollution, safety and reliablility It requires very few automatic valves or complex control sequences that need supervision by an operator It requires little space It produces high pure water in a constant flow It provides complete removal of dissolved inorganic particles In combination with reverse osmosis pre-treatment, it removes more than Introduction to EDI gives you the basics.


May be registered in one or more countries. The electric current supplied from various energy sources charges the ions that make up the contaminants. Regeneration chemicals are costly, hazardous and, even though they are neutralized prior to releasing to streams and rivers, add a significant amount of dissolved solids to the waterways.

Water enters the EDI module, where an applied current forces ions to move through the resins and across the membranes.

Water is passed between an anode positive electrode and a cathode negative electrode. By eliminating the periodic regeneration requirement of ion exchange resin, environmental syystem are also realized by avoiding the handling and processing of acid and caustic chemicals brought to the site. Eliminates expensive and hazardous chemicals used in ion-exchange resin regeneration Reduces energy and operating expenses Reduces the facility size requirement Helps plants meet ISO requirements.

Electrodeionization (EDI) – Samco Tech

With EDI system membranes and electricity replace the million elwctrodeionization of acid and caustic chemicals that the old processes required daily. There are several effective and relatively inexpensive ways to remove CO 2 in the pretreatment system. This technology can be used as an alternative to single-use purification cartridges.

Argonne National Laboratory estimates that Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible. While both ion exchange and EDI use ion exchange resins, the removal mechanisms electroseionization quite different.

As impurities leave via the concentrate water system, their build-up does not exhaust the resin elecrtodeionization therefore prolongs resin lifespan. Please improve this by adding secondary or tertiary sources.

Regenerable Mixed Bed Deionization No acid or caustic bulk storage, pumping, waste neutralization or disposal issues.

The ionization reactions occurring in the resin in hydrogen or hydroxide forms for the removal of weakly ionized compounds are listed below:. 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.

If you’d like to talk with a sales representative about purchasing SUEZ’s products and services, you can reach us here. In this way these charged strong-ion species are continuously removed and transferred in to the adiacent concentrating compartments.

The water produced has met or exceeded customer high-purity water specifications. Purified water flows out through the opposite side of the compartment. EDI is a continuous process.

Each electrode may become either the anode or the cathode depending on the voltage applied to the cell. The strong, applied electrical potential splits water at the surface of the resin beads, producing hydrogen and hydroxyl ions. High purity deionized water results.


Ions that become bound to the ion exchange resins migrate to a separate chamber under the influence of an externally applied electric field. You may also be interested in Only the ions can pass through the membrane, the systeem is blocked. It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a polishing treatment to reverse osmosis RO.

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.

Transport through resin bead particle diffusion can be limiting. An EDI stack has the basic structure of a deionization chamber. A bipolar electrode is an electrode that functions as the anode of one cell and the cathode of another cell. The ionization reactions occurring in the resin in hydrogen or hydroxide forms for the removal of weakly ionized compounds are listed below: This section is broken down into the following topics: EDI utilizes chemical-free regeneration.

Most EDI devices have a 1 ysstem hardness limit which is easily addressed with proper pretreatment system design. Removal Mechanisms While both shstem exchange and EDI use ion exchange electrodfionization, the removal mechanisms are quite different. These systems typically use cation exchange vessels followed by anion exchange to handle the bulk of the demineralization.

The ion exchange resins act to retain the ions, allowing these to be transported across the ion exchange membranes. EDI has a significantly smaller footprint than conventional ion exchange processes. Each cell consists of an electrode and an electrolyte with ions that undergo either oxidation or reduction.

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.