Reverse osmosis (RO) technology is a method that uses membrane separation to remove ions in water. Although the reverse osmosis system removes 95%-98% of ions in water, it cannot meet the requirements of industrial production. The subsequent processes must use ion exchange equipment. . In recent decades, the mixed bed ion exchange technology has been the standard process for the preparation of pure water. Because it needs periodic regeneration and uses a lot of chemicals (acid and alkali) and pure water in the regeneration process, it is difficult to be satisfied with the acid-alkali-free pure water system.
Because traditional ion exchange has become increasingly unable to meet the needs of modern industry and environmental protection, the EDI technology that combines membrane and resin has become a revolution in water treatment technology. This technology uses electric regeneration ion exchange desalination process to replace the traditional mixed ion exchange desalination process DI. High desalination effect is achieved through ion exchange resin and selective ion membrane, and the combined process combined with reverse osmosis makes the water quality of 10~17M Ω·CM high specification water produced.
EDI is a new type of desalination technology formed by organically combining electrodialysis technology and ion exchange technology. It can effectively remove all ions in the water, the resistivity of the effluent can be stabilized above 15MΩ.CM, continuous operation, no chemical pollution, high water utilization, and has broad application prospects in the preparation of high-purity water. The EDI device is applied after the reverse osmosis system to replace the traditional mixed ion exchange technology (MB-DI) to produce stable deionized water.
The first stage: pretreatment——> positive bed ——> negative bed ——> mixed bed
The second stage: Pretreatment——> Reverse Osmosis ——> Mixed Bed
The third stage: Pretreatment——>Reverse Osmosis——>EDI device