EDI equipment and mixed bed equipment have the following advantages:
The water quality is stable
Automatic control is easy to achieve
It will not stop because of regeneration
No chemical regenerative EDI system is required
Low running cost
The size of the workshop is small
Principle of EDI working without sewage discharge:
EDI module is used to form the EDI unit between ion exchange resin and the cathode/cation exchange membrane.
The working principle of EDI is shown in the figure.
In EDI module, a certain number of EDI units are separated by a grid to form a thick water chamber and a fresh water chamber.
It also sets the negative/positive electrode at both ends of the unit group.
Under the push of direct current, the Yin and Yang ions in the water flow through the fresh water chamber are separated into the concentrated water chamber and removed in the freshwater chamber.
Through the water in the thick water chamber, the ions are brought out of the system to become a strong water. EDI equipment is generally used as a secondary reverse osmosis (RO) pure water as the EDI feed water.
RO pure water resistivity is 40-2 mu S/cm (25 ℃).
EDI pure water resistivity can be as high as 18 M Ω. Cm (25 ℃), but according to deionized water usage and system configuration Settings, EDI ultrapure water is suitable for the preparation of resistivity requirement in 1-18.2 M Ω. Cm (25 ℃) of pure water.