Electrodeionization (EDI) Systems are a kind of deionization technology used to generate ultra pure water. These systems use direct flow, ion-selective resin and ion-selective membranes in a hybrid way to perform water purification process, eliminating the need for regeneration chemicals.
Electrodeionization is a water purification process that uses a combination of (-) Anode and (+) Cathode, ion-selective membranes forced between two electrodes and ion exchange resins under a constant high direct flow.
Reverse Osmosis (R/O) Systems are employed as a first stage before Electrodeionization (EDI) Systems. The membranes used in the Reverse Osmosis (R/O) Systems ensure ion removal by 92-99% to obtain purified water (<50 mS/cm). Electrodeionization (EDI) Systems are the second stage in obtaining ultra pure water. They remove the ions in the Reverse Osmosis (R/O) generation water to ensure ultra pure water (<0.05 mS/cm) is obtained.
Benefits of Electrodeionization (EDI) Systems:
- Electrodeionization (EDI) Systems are an environmentally friendly technology that replace conventional mixed bed resin units.
- They reduce even ions like silica and boron, which are difficult to remove from water, to near-zero levels.
- Because the system does not require regeneration according to its operational principle, the desired water quality is maintained continually.
- No operator intervention is required and there are no complex operating procedures.
- There is no need to store toxic chemicals as regeneration chemicals are not used.
- The EDI Concentrated water can be reused as it does not contain any chemicals.
- These are effortless to install due to their chassis-mounted design.
- If the inlet water values change, you just need to clean the stacks. For Resin Deionization (DI) systems, additional regeneration will be required.