Electro-deionisation System
Electrodeionization also knowing is EDI or CEDI is a water treatment technology that utilizes DC electricity, ion exchange membranes and ion exchange resin to deionize water. It is an electrically-driven water treatment technology that uses electricity, ion exchange membranes and resin to remove ionized species from water.
EDI removes ions and other charged species from water, for example salts and organic acids.
How it works?
The EDI module consists of a set of chambers filled with ion exchange resins and separated by ion-exchange membranes. Water enters the module, where an applied electrical field at right-angles to the flow forces ions to move through the resins and across the membranes. These impurity ions are not permanently bound to the media but instead are collected into concentrate streams which can be directed to drain or recycled.
The EDI module acts, in effect, as an ion exchange bed which is continuously regenerated electrically. When the ions are moved through the resins and between the cation or anion selective membranes, they are exchanged for H+ and OH- ions. Ions that become bound to the ion exchange resins eventually migrate to a separate chamber under the influence of the externally applied electric field; this also produces the H+ and OH- ions necessary to maintain the resins in their regenerated state. Ions in the separate chamber are flushed to waste.
We provide both EDI stack/modules, and prefabricated/engineered EDI System.
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