Could the experts please explain the comparison between mixed-bed systems and EDI?

There is a difference in the water quality produced by the two systems: the resistivity of the water output from a mixed-bed system is generally 40–2 μS/cm, while that of the water output from an EDI system is around 18 μS/cm. EDI produces better water quality; it depends on the purpose for which your desalinated water is intended. Generally, EDI serves as a secondary treatment facility for RO.

Organize a paragraph: 1. EDI does not require acid-base regeneration; instead, the resin is regenerated by the H+ and OH- ions generated through hydrolysis during electrodialysis polarization, and the by-products are discharged into the concentrated water chamber. Therefore, its operation is automatic with very little manual intervention. MB requires acid-base regeneration, generates acid-base wastewater that is harmful to the environment, and is also complicated to operate. 2. EDI has strict requirements regarding the quality of the incoming water; since the resin used in it cannot be backwashed or regenerated, it is necessary to completely remove particulates and colloids from the water. Additionally, because only a small amount of resin is used in EDI, the salt content in the incoming water must be very low. RO water is suitable. In situations with high salt content, MB is often used in combination with RO, placed after RO. Firstly, it can further improve the quality of the water produced by the RO system. Secondly, the RO process in the earlier stages already **reduces the ion content in the feed water, which allows for longer intervals between ion exchange operations, reduces the amount of acids and bases needed, lowers emissions, and simplifies operations. 3. EDI is usually designed in a modular format, with each module having a low processing capacity. For example, the output per unit of EDI systems manufactured by Electropure ranges from 0.17 to 9.06 m3/h, while the output per unit of GE’s EDI products ranges from 1.14 to 4.08 m3/h. 4. The water output from EDI can meet the MB water standards, satisfying the requirements for boiler water and water used in the electronics industry. 5. The investment cost for EDI equipment is high.