EDI offers several advantages, developed as an alternative to conventional deionization (DI) processes.
The EDI process involves the electrical removal and separation of ions from a water body. Essentially, EDI is an ion exchange process but does not require chemical reagents and is a continuous process.
Operating Principle
Cation Exchange Membrane: An EDI system includes cation exchange membranes and anion exchange membranes to control the movement of ions. The process typically starts with a cation exchange membrane.
Electrodes: The system contains a series of electrodes that apply an electric field, accelerating the movement of ions.
Electrodeionization Zone: Water is introduced to one side of the cation exchange membrane. The electric field attracts cations (+) and anions (-) in the water.
Anion Exchange Membrane: Water encounters an anion exchange membrane after passing through the cation exchange membrane. The anion exchange membrane retains anions while releasing cations.
Outlet Water: As a result of this separation process, the outlet water achieves high purity or specific ion concentrations.
Advantages
No Need for Chemical Regeneration: EDI does not require using chemical reagents, reducing operational costs and waste production.
Continuous Process: EDI operates continuously, ensuring a constant water supply.
Automation and Easy Monitoring: EDI systems are often automated and monitored, making operations convenient.
High Purity: EDI is suitable for industrial and laboratory applications that require high purity.
Environmentally Friendly: It is a more environmentally sustainable option due to reduced chemical usage and waste production.
Electrodeionization is an effective water treatment technology for efficiently removing or separating ions in water.