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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 may be considered to be a competitive alternate process to: Water treatment Ions Physical chemistry Separation processes. 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 prodess conventional ion exchange processes.

How EDI removes ionized species from water. It will also better prepare you for the content in the Intermediate EDI section. This page was last edited on 10 Octoberat Reuse of residual water procesz 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 electrodeonization purity production water for either power plant boiler feed processs microchip rinse water.

This technology can be used as an alternative to single-use purification cartridges. The strong, applied electrical potential splits water at the surface of the resin beads, producing hydrogen and hydroxyl ions. EDI is a technology that combines ion exchange resins and ion-selective membranes with direct current to remove ionized species from water.


Case Studies Download Centre. These systems typically use cation exchange vessels followed by anion exchange to handle the bulk of the electrodeiobization. Enables a simpler system no concentrate recirculation Produces ultrapure water up to 18 megohm. CEDI technique can achieve very high purity, with conductivity below 0. They are ideal for multiple applications including: Sensitivity to chlorine EDI is just as sensitive to the chlorine as thin-film reverse osmosis RO processes.


In this compartment the pH becomes neutral, and H2 gas is generated. The ion exchange resins act electtrodeionization retain the ions, allowing these to be transported across the ion exchange membranes. 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.

The ion-selective membranes are fixed to an inert polymer frame, which is filled with mixed ion-exchange resins to form the purifying chambers. RW-EDI is a process that targets the desalination of impaired water or water with salt levels of 1, – 10, ppm. No proxess breakthrough resulting in a constant high quality of water.

From Wikipedia, the free encyclopedia. Located in a severely water scarce area in Tarragona, our customer, Gas Natural, needed to convert seawater into ultrapure water for power production. EDI is used with reverse osmosis to replace ion exchange resin-mixed beds, which require onsite or offsite chemical regeneration.

This section is dedicated to those who are just learning about Continuous Electrodeionization also known in generic terms as Electrodeionization EDI.

State-of-the-art water treatment systems utilize reverse osmosis RO membranes to do the bulk of the demineralization. The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration. By using this site, you agree to the Terms of Use and Privacy Policy. Argonne National Laboratory estimates proccess 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.


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 site.

ELGA Process Water │Electrodeionization (EDI)

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. 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 and the associated need to change or regenerate the resins.

Regenerations of ion exchangers typically takes several hours, require bulk storage and pumping facilities for regenerant chemicals, and usually require a waste neutralization tank.

Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible. It differs from other water purification technologies in that it is done without the use elfctrodeionization chemical treatments and is usually a polishing treatment to reverse osmosis RO.

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. The deionized product water can then be used directly or undergo further treatment for enhanced water purity. Ions that become bound to the ion exchange resins migrate to a separate electeodeionization under the influence of an externally applied electric field.