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(1)Mixed Bed System
    Mixed bed is the abbreviation for mixed ion exchange column. This equipment is designed according to ion exchange technology. The so-called mixed bed is to put a certain proportion of cation and anion exchange resin and fill them in the same exchange device, to exchange and remove the ion in the fluid. Because the specific gravity of the cation resin is bigger than anion resin, so in the mixed bed, the anion resin is in the upper layer and the cation resin is in the lower layer. Generally cation resin and anion resin’s filling ratio is 1:2, and the ratio of 1:1.5 is also available, can choose according to different resin. Mixed bed also can be divided into internal synchronous regenerative mixed bed and external regenerative mixed bed. Synchronous regenerative mixed bed’s operation and the whole regeneration process are conducted in the mixed bed, and the regeneration resin will not be removed from the equipment, and cation and anion resin are regenerating at the same time, so it needs less equipment and with simple operation.
     It has the following advantages:
1.      Effluent quality is good, water PH value is close to neutral.
2.    The effluent quality is stable, short time running conditions’ change (such as water quality or composition, flow speed, etc.) has small influence on the water quality of the mixed bed.
3.    Discontinuous operation has little impact on the effluent quality, only need short time to restore to the qualified water.
(2)EDI system
     Electrodeionization (EDI) technology is the integration of electrodialysis and ion exchange technology,by the anion and cation exchange membrane’s selective through function of the anion and cation and the ion exchange resin’s ion exchange function, under the action of DC power plant to realize the directional migration of ions, thus complete the thoroughly desalination of the water, at the same time, the hydrogen ion and hydroxyl ions from water’s ionization can regenerate the ion exchange resin to, so the acid and alkali chemical regeneration is not needed and still can continuously produce the ultrapure water. 
Working principle of the EDI
1.      After the RO produced water entering EDI module, it is evenly distributed to the fresh water chamber.
2.    Small amount ions that are not removed by RO membrane are absorbed on the surface membrane of the ion exchange resin in the fresh water chamber.
3.    The direct current (dc) on EDI module at both ends of the electrodes drive the cation and anion of fresh water chamber to the corresponding electrode and move to thick water chamber, thus producing high pure water.
4.    Under the action of the power plant, a lot of water molecules are ionized into H + and OH -, thereby continuously regenerate the ion exchange resin.
EDI water feeding conditions
1.      Water: RO (reverse osmosis) water production
2.    Conductivity: ≤20μs/cm
3.    The best conductivity: 2 ~ 10μs/cm
4.    Maximum conductivity: ≤50μs/cm
5.     PH value: 6-8
6.    Temperature: 5 ℃ - 38 ℃
7.     Inlet water pressure: 0.2-0.6Mpa
8.    Hardness: less than 0.5 ppm (calculated by CaCo3)
9.    Silicon: less than 0.5 ppm (calculated by SiO2)


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