Urgently need information on EDI

Please refer to http://bbs.hcbbs.com/viewthread.php?tid=68064

Electrodeionization system (EDI): EDI technology combines electrodialysis and ion exchange techniques in a cohesive way, enabling the effective removal of trace electrolyte ions from water. It can produce high-quality pure water on a 24/7 basis, and offers advantages such as simple installation, easy operation and maintenance, no need for acid or base regeneration, and no environmental pollution. Working principle The EDI membrane stack is composed of a certain number of cells sandwiched between two electrodes. Within each unit, there are two types of chambers: a fresh water chamber where desalination takes place, and a brine chamber that collects the impurity ions that have been removed. The fresh water chamber is filled with mixed cation and anion exchange resins, which are located between two membranes: a cation exchange membrane that allows only cations to pass through, and an anion exchange membrane that allows only anions to pass through. 　　The resin bed is continuously regenerated using direct current applied to both ends of the chamber; this voltage causes the water molecules in the incoming water to split into H+ and OH-. These ions are attracted by the corresponding electrodes and move through the cation and anion exchange resins toward the respective membranes. Once these ions pass through the exchange membranes and enter the concentrated chamber, H+ and OH- combine to form water. It is precisely this generation and migration of H+ and OH- that constitutes the mechanism by which the resin achieves continuous regeneration. 　　When impurity ions such as Na+ and Cl- in the water are adsorbed onto the corresponding ion exchange resins, these impurity ions undergo ion exchange reactions similar to those that occur in ordinary mixed-bed reactors, thereby displacing H+ and OH-. Once the impurity ions within the ion exchange resin also join the migration of H+ and OH- toward the exchange membrane, these ions will continuously pass through the resin until they penetrate the exchange membrane and enter the concentrated water chamber. Due to the barrier effect of the exchange membranes in adjacent compartments, these impurity ions cannot migrate further toward the corresponding electrodes; as a result, they accumulate in the concentrated water compartment, and this concentrated water containing impurity ions can then be discharged from the membrane stack. System features ⊙ High and stable water quality of the produced water. ⊙ Continuous water production without interruption, no shutdown during regeneration. ⊙ No chemical regeneration is required. ⊙ Imagine a thoughtfully designed stacked format that occupies minimal space. ⊙ Simple to operate and safe. ⊙ Operating and maintenance costs are low. ⊙ No acid-base reserve or shipping costs. ⊙ Fully automatic operation, no need for manual supervision. Technical performance: EDI feedwater requirements. To prevent clogging of the device and extend its operational life, EDI has certain requirements regarding the quality of the feedwater; generally, RO-treated water is used as the feedwater. EDI maintenance The installation and operation of EDI water treatment systems should be carried out under the guidance of professional personnel, with operations performed by trained staff. 　　After long-term operation or under certain abnormal operating conditions, the EDI module and its fittings may become clogged due to scaling, biological contamination, or the formation of metal oxides. Different cleaning formulations can be used to clean the EDI system.