Working principle of EDI electrodeionization:
The EDI electro deionization device forms an EDI unit by sandwiching ion exchange resin between anion/cation exchange membranes. The working principle of EDI is shown in the diagram. In the EDI component, there will be a certainThe 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.

Introduction to EDI Technology:
EDI deionization equipment generally uses reverse osmosis (RO) pure water as EDI feed water. The conductivity of RO pure water is generally 40-2 μ S/cm (25 ℃). The resistivity of EDI pure water can reach up to 17M Ω. cm (25 ℃), but depending on the usage, system process, and configuration of deionized water, EDI pure water is suitable for preparing ultrapure water with resistivity requirements ranging from 1-18.2 M Ω. cm (25 ℃).

The Development History of EDI Electrodeionization Technology:
In recent decades, mixed bed ion exchange technology has been the standard process for preparing ultrapure water. Due to the need for periodic regeneration and the use of a large amount of chemicals (acids, bases) and pure water during the regeneration process, which causes certain environmental problems, it is necessary to develop an ultra pure water system without acid-base treatment.
Because traditional ion exchange is increasingly unable to meet the needs of modern industry and environmental protection, EDI technology combining membranes, resins, and electrochemical principles has become a revolution in water treatment technology. The regeneration of its ion exchange resin uses electricity instead of acid and alkali, which better meets the environmental requirements of today's world.
Since the industrialization of EDI membrane stack technology in 1986, thousands of EDI electrodeionization systems have been installed worldwide, especially in industries such as pharmaceuticals, semiconductors, power, and surface cleaning, which have been vigorously developed. At the same time, they have also been widely used in wastewater treatment, beverages, and microbiology.

Characteristics of EDI Electrodeionization Equipment:
1. The quality of the produced water is high, stable, and continuous
2. Easy to operate and safe
3. Will not shut down due to regeneration
4. No need for acid or alkali chemical agents for regeneration
5. The operating cost is lower than that of a mixed bed
6. Small footprint
7. No sewage discharge
8. Easy to achieve fully automatic control