Whatis Electrode ionization (EDI)?
EDI is a process which combines semi-impermeable membrane technology with ion - exchange media to provide a high efficiency demineralization process.Electrodialys is employ electrical current and specially - prepared membranes which are semi permeable to ions based on their charge, electrical current, and ability to reduce the ions based to their charge.
Electro dialysis an electrical potential transports and segregates charged aqueous species. The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration.
The EDI process produces industrial process water of very high purity, using less than 95% of the chemical products used in the convention alion exchange processes.
Why to choose us?
EFPL offers a wide range of sizes, materials of construction and configurations to meet all of your EDI water needs. They can be ordered either as a stand-alone unit or integrated into the most complex of de-ionized water control systems. EDI brings advances in both energy and operating expenses to the high purity water treatment train.
An EDI stack has the basic structure of a deionization chamber.The chamber contains an ion
Exchange resin, packed between a cationic exchange membrane and ananionic exchange membrane.
Only the ions can pass through the membrane, the water is blocked.When flow enters the resin filled diluting compartment, several processes are set in motion. Strong ions are scavenged out of the feed stream by the mixed bed resins. 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. In this way these charged strong -ion species are continuously removed and transferred in to the adjacent concentrating compartments. As the ions go towards the membrane, they can pass through the concentration chamber (see figure) but they cannot reach the electrode. They are blocked by the contiguous membrane that contains a resin with the same charge.
As the strong ions are removed from the process stream, the conductivity of the stream becomes quite low. The strong, applied electrical potential splits water at the surface of the resin beads, producing hydrogen and hydroxyl ions. These act as continuous regenerating agents of the ion - exchange resin. These regenerated resins allow ionization of neutral or weakly - ionizedaqueous species such as carbon dioxide or silica. Ionization is followed by removal through the direct current and the ion exchange membranes.
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