Electro deionization process is utilized predominantly for the production of high purity water. EDI is generally used as a post treatment, after a Reverse Osmosis to achieve high purity water. Typically EDI is used to achieve the treated water quality for the following applications
- Semi conductor industry production water
- Printed circuit board manufacturing
- Solar cell manufacturing
- Pharma grade water
- Vaccines
- Parental
- Water for Injection
EDI utilizes and operates on the principle of migration of charged ions across a semi-permeable membrane which contains charged resin beds. The migration of membranes is initiated by applying current, by means of cathode and anode. This generates the migration of ions across the oppositely charged membranes. The oppositely charged ions permeate through the charged membranes and collect in the concentrate chamber. A constant flow is maintained in the concentrate chamber to continuously evacuate the ions into the reject stream.
The ultra pure water from the pure water chamber flows out continuously. The reject water is not wasted and is recycled back to the pre-treatment sections.