Electro Deionization System

Type: Plate & Frame Type System

Purpose: polishing of Water.

Process Description

Continuous electro deionization is a technology combining ion exchange resins and ion-selective membranes with direct current to remove ionized species from water. It was developed to overcome the limitations of ion exchange resin beds, notably the release of ions as the beds exhaust and the associated need to change or regenerate the resins.

CEDI beds are typically also smaller and remain in service for much longer periods. CEDI is preferred for many purified water generation applications in Pharma, because of its “clean” nonchemical nature and constant high quality water produced. The resins used in CEDI systems can either be separate chambers of anion or cation beads, layers of each type within a single chamber or an intimate mixture of cation and anion beads.

Working Principle

Reverse osmosis permeate passes through one or more chambers filled with ion exchange resins held between cation or anion selective membranes. Ions that become bound to the ion exchange resins migrate from the dilute chamber to a separate chamber (concentrate) under the influence of an externally applied electric field, which also produces the H+ and OH- necessary to maintain the resins in their regenerated state. Ions in the concentrate chamber are recirculated to a break tank or flushed to waste. The ion exchange beds in continuous electrodeionisaton (CEDI) systems are regenerated continuously, so they do not exhaust in the manner of ion exchange beds that are operated in batch mode (with chemical regeneration).

Hot water sanitization has been shown to be more effective than chemical sanitization for controlling microbial growth. Ease of operation, maximum reliability and low operating costs are signature features of EDI modules. HWS modules are ideal for pharmaceutical, biotechnology and other applications where chemical-free, instant hot water sanitization is desired. HWS modules produce high purity water without regeneration downtime.

Feed Water Specifications
Feed Water Conductivity Equivalent,
including CO2 and Silica
< 40 µS/cm
Temperature 41 —113°F (5-45°C)
Inlet Pressure 20 — 100 psi (1.4 — 7 bar)
Maximum Free Chlorine (as CL2) <00.02 ppm
Iron (Fe) <0.01 ppm
Manganese (Mn) <00.01 ppm
Sulfide (S-) <00.01 ppm
pH 4 – 11
Total Hardness (as CaCO3) <01.0 ppm/td>
Dissolved Organics (TOC as C) <00.5 ppm
Silica (SiO2) <01.0 ppm

Standard Specification

  • Designed for Industrial uses
  • Hot water & Chemical Sanitizable
  • Custom sizes and configurations
  • Low footprint with optimal accessibility
  • Constructed in Durable SS skid, SS-316/L pipe valve & fittings
  • Accessories include sampling valves etc.
Technical Fitures Benefits
Green & Energy efficient technology Lower operating cost
Costumized Systems System most suited for your application
Skid mounted design Lower foot print, saving of production srea
Build CIP System Easy & Fast cleaning
Wide choice of membrane MOC & Geometries Selection of best membrane for your application
Complete Turnkey Projects management with process guarantee One stop solution for all your needs