Download scientific diagram | Electrodeionization process diagram from publication: Study on the influence of applied voltage and feed concentration on the. Introduction to continuous electrodeionization concepts. EDI may be considered to be a competitive alternate process to: Regenerable Mixed Bed. Discover electrodeionization (EDI) solutions from SUEZ which offer superior provide key advantages compared to traditional ion-exchange processes.

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

Ireland Start search OK. High purity deionized water results. Home page Technical Electrodeionization. By eliminating the periodic regeneration requirement of ion exchange resin, environmental benefits are also realized by avoiding the handling and processing of acid and caustic chemicals brought to the electrodeipnization.

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. This technology can be used as an alternative to single-use purification cartridges.

Electrodeionization – Wikipedia

Regenerations of ion exchangers typically takes several hours, require bulk storage and pumping facilities for regenerant chemicals, and usually require a waste neutralization tank. Views Read Edit View history. 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. Water is passed between an anode positive electrode and a cathode negative electrode.

This acidic stream then flows into the cathode compartment, formed between the cathode – and its adjacent cationselective membrane. These act as continuous regenerating electrodejonization of the ion-exchange resin.



Elecrodeionization of large EDI 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.

Some of the advantages of the EDI as opposed to the conventional systems of ionic interchange are:. EDI is a technology that combines ion exchange resins and ion-selective membranes with direct current to remove ionized species from water. Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design.

You may also be interested in Its development and use in water purification overcame some of the limitations eldctrodeionization ion exchange resin beds, particularly electroreionization release of ions as the beds exhaust.

Electrodeionization | Water Solutions

The main applications of EDI technology, such as that supplied by Ionpure, E-cell and SnowPure, are in electronics, pharmaceuticals and power generation.

This section is broken down into the following topics:. No ionic breakthrough resulting in a constant high quality of water. The ion-selective membranes are fixed to an inert procesa frame, which is filled with mixed ion-exchange resins to form the purifying chambers.

The electrolyte stream flows past the anode and cathode sequentially. 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. How does it work? As impurities leave via the concentrate water system, their build-up does not exhaust the resin and therefore prolongs resin lifespan.

In some cases, the ion procesw resins actually contribute to the TOC content in the water. The EDI process is a continuous process, utilizes no chemicals for regeneration, does not pollute the environment and requires a fraction of the operator attention necessary for conventional ion exchange systems.


Water passes through one or more chambers filled with ion exchange resins held between cation or anion selective membranes. EDI provides a high quality water, low in particles, partiall due to the fact that there is no resin attrition from electrodeionisation or osmotic shock, as would be the case with conventional ion exchange processes.

Introduction to EDI gives you the basics. In addition, when a diluite stream cleaning was required as result of fouling, product quality was completely recovered. Articles lacking reliable references from December All articles lacking reliable references.

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. From Wikipedia, the free encyclopedia.

Sensitivity to chlorine EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes. EDI is a process which combines semi-impermeable membrane technology with ion-exchange media to provide a high efficiency demineralization process.

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In this way these charged strong-ion species are continuously removed and transferred in to the adiacent concentrating compartments. Sensitivity to hardness Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design. Please improve this by adding secondary or tertiary sources. 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.