Product Introduction

Specializing in the research and development, design, and manufacturing of water treatment equipment

Electrodeionization（EDI technology is a new membrane separation technology formed by the organic combination of electrodialysis and ion exchange. It not only utilizes the advantages of electrodialysis for continuous desalination and ion exchange resin for deep desalination, but also overcomes the negative effects of electrodialysis concentration polarization and the defects of ion exchange resin requiring acid-base regeneration and unable to work continuously. The water production process can be carried out continuously for a long time.

working principle

In the EDI component, a certain number of EDI units are separated by a mesh to form a concentrated water chamber. Negative/positive electrodes are also installed at both ends of the unit group. Driven by direct current, the anions and cations in the water flow of the fresh water chamber pass through the cation exchange membrane and enter the concentrated water chamber, where they are removed. And the ions are carried out of the system by the water in the concentrated water chamber, becoming concentrated water EDI equipment generally uses reverse osmosis (R0) pure water as EDI feed water. The pure water resistivity of R0 is generally 40~2 μ S/cm (25 ℃). EDI pure water resistivity can reach up to 18M Ω· cm (25 ℃), but depending on the purpose of deionized water and system configuration settings, EDI pure water is suitable for preparing pure water with resistivity requirements between 1-18.2M Ω· cm (25 ℃).

Advantages of EDI

1. The effluent quality is very stable;
2. Capable of continuous operation and producing ultra pure water that meets user requirements;
3. No need for acid-base regeneration, no wastewater discharge;
4. Modular production, fully automated control;
5. No need to shut down due to regeneration;
6. Compact equipment structure and small footprint;
7. Low operating and maintenance costs;
8. Simple operation and low labor intensity

Scope of application

EDI, as a device for producing ultrapure water and a secondary desalination equipment after reverse osmosis, can produce up to 10-18.2 M Ω CM. EDI equipment does not require the regeneration of chemical agents and can operate continuously. In specific applications, simply adjusting the operating current of EDI can change its effluent quality. Therefore, it is widely used in the microelectronics industry, semiconductor industry, power generation industry, and laboratories. It can also be used as feed water for food and beverage production, boiler supply water for power plants, and other applications of ultrapure water.