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Electro-deionization units

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Electro-deionization units

PURPOSE

Electro-deionization units are used for reagent-free receipt of highly demineralized water with specific electric resistance up to 18 MOhm·cm.

TECHNOLOGICAL PROCESS SCHEME

TECHNOLOGICAL PROCESS DESCRIPTION

Electro-deionization technology is based on a continuous process involving ion-exchanged membranes, ion-exchanged resins and the flow of direct current.

The electro-deionization process is carried out as a result of the selective transfer of charged ions through selective membranes (cation-exchange and anion-exchange) under the influence of an electric field. Thereby negatively charged ions (anions) move to anode and positively charged to cathode, respectively.

Special cells are used to realize the electro-deionization process. Electrodes are placed in two ultimate cells which are separated by ion-selective membranes. Chambers with purified water are filled in with cation and anion resin mixture to reduce the electric resistance of the water.

Continuous ion translation under the influence of the flow of direct current is performed through ion resin grains to relevant ion-selective membranes. As a result, the salt concentration in electrode chambers will rise and fall in the middle chamber.

Electro-deionization is a reagent-free way of water purification. Cathode emits hydrogen ions and anode emits hydroxyl ions which regenerate ion-exchanged resins.

For more information about the operating principles of electro-deionization units, see the video.

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Features:
  • Receipt of highly demineralized water in automatic mode without using chemical reagents
  • Deep elimination of soluble silicates from water
  • Electronic quality control of demineralized water
  • Low operational costs
  • No need for waste water neutralization and dilution
  • Construction compactness
  • Average lifetime of units between chemical flushings is 2 years