EDI water treatment process

EDI water treatment 

The working principle of EDI ultrapure water treatment equipment: Electrodeionization (EDI) system is mainly under the action of direct current electric field, the dielectric ions in the water passing through the partition move directionally, and the selective permeation of ions by the exchange membrane is used to improve the water quality. A scientific water treatment technology for purification. Between a pair of electrodes of an electrodialyzer, there are usually multiple sets of anion membrane, cation membrane and separators (A, B) alternately arranged to form a dense chamber and a weak chamber (that is, cations can pass through the cation membrane, and anions can pass through the anion membrane). The cations in the water in the depleted room migrate to the negative electrode through the positive membrane, and are intercepted by the negative membrane in the thick chamber; the anions in the water migrate towards the positive electrode and are intercepted by the positive membrane in the thick room, so that the number of ions in the water passing through the depleted room gradually decreases. It becomes fresh water, and the water in the thick room, due to the continuous influx of anions and cations in the thick room, the concentration of dielectric ions continues to rise, and becomes thick water, so as to achieve the purpose of desalination, purification, concentration or refining.

Advantages of EDI ultrapure water treatment equipment:

1) No need for acid-base regeneration: the resin in the mixed bed needs to be regenerated with chemicals acid-base, and EDI eliminates the processing and heavy work of these harmful substances. Protect the environment.

2) Continuous and simple operation: In the mixed bed, the operation process becomes complicated due to each regeneration and the change of water quality, while the water production process of EDI is stable and continuous, and the water quality is constant, without complicated operations The procedure and operation are greatly simplified.

3) Reduced installation requirements: EDI system has a smaller volume than a mixed bed with a considerable amount of treated water. It adopts a modular structure and can be flexibly constructed according to the height and scent of the site. Modular design makes EDI easy to maintain during production work.