الوصف

Characteristics of pre-processing technology

The mixed exchanging technology is replaced by CDI technology which has strict requirements on the feed water. The preprocessing technology is complex. Before the raw water enters the CDI system, in order to prevent the resin and membrane from being polluted, prevent the membrane surface from scaling and protect the membrane performance, the treatments of filtering, adsorbing, softening, degassing and the like should be carried out sequentially.

â—† Softening

The scale inhibitor can be used in the RO-CDI system to increase the hardness of the RO membrane and lead the RO membrane to enter the CDI system. In order to make the cleaning frequency of the CDI minimum, the water feeding hardness of the CDI should be minimum.

â—† Degassing

In order to obtain purified water with high resistivity and high quality, the gas in the feed water should be removed, wherein most of the CO2 should be removed. The CO2 with low content can lead the CDI module to remove the SiO2 more effectively. The degassing unit may as well be arranged behind the RO.