Electrodeionization Systems

are producing high purity water of up to 18.2 Megohm-cm. EDI eliminates the need to store and handle chemicals required for resin regeneration and associated neutralization steps.

Ultrapure Water Systems

Ultrapure water (UPW) is water that has been purified to very strict specifications, containing by definition only H₂0, and H⁺ and OH^– ions in equilibrium.

Ultrapure Water Applications:
» Semiconductor and Electronic Industries.
» Pharmaceuticals and Cosmetics.
» Hospitals and Laboratories.
» High pressure Boiler Feed.
» Different industrial applications in Chemical and Engineering Industries.

Ultrapure water systems should contain a combination of purification technologies, each designed to remove a particular range of contaminants. No single technology alone will produce high quality Ultrapure water efficiently or economically.

Ultrapure water is often produced through processes like Reverse Osmosis and/or ion exchange System to reach the ultimate conductivity of 10 uS/cm, the demineralised water is then processed through a Mixed Bed Unit or by Electrodeionization System.

Reverse Osmosis will remove 95 – 98% leaving Mixed Bed Unit or Electrodeionization System to remove the reminder.

Electrodeionization Systems

The Electrodeionization (EDI) process, invented over 25 years ago, is a continuous, free chemical process that removes ionized and ionizable impurities from the feed water using DC power. EDI is most commonly used to treat reverse osmosis (RO) permeate and replace mixed bed (MB) ion exchange units; producing high purity water of up to 18.2 Megohm-cm. EDI eliminates the need to store and handle chemicals required for resin regeneration and associated neutralization steps.

Process of Electrodeionization

EDI design combines two well-established water purification technologies, Electrodialysis (ED) and ( I ) Ion-exchange resin deionization. Through this revolutionary technique, dissolved salts can be removed with low energy cost and without the need for chemical regeneration; the result is high-quality pure water of multi-MΩ.cm resistivity which can be produced continuously at substantial flow rates.

The electrodeionization process uses a combination of ion-selective membranes and ion-exchange resins sandwiched between two electrodes (anode (+) and cathode (-)) under a DC voltage potential to remove ions from RO-pretreated water.

Our Systems:

MDC Water offers a complete range of EDI systems for any process and application, each EDI Unit is “tailor made” to meet the different specificity of our customers requirements.