EDI Pure Water Equipment

All Products

Want More Information ?

Product Profile

Electrodeionization technology is a new process of pure water preparation combining ion exchange technology, ion membrane separation technology, and ion electromigration technology. An EDI module consists of several units connected in parallel. An EDI unit consists of an ion exchange resin, an ion exchange membrane, and a DC electric field. Ion exchange membranes are divided into anion exchange membranes and cation exchange membranes. Cation exchange membranes allow only cations to pass through, while anions and water cannot pass through while anion exchange membranes allow only anions to pass through. The anion exchange membrane and cation exchange membrane are arranged at intervals to form an alternating concentrated and freshwater chamber. The anion-cation mixed ion exchange resin is filled in the freshwater section. Under the action of the applied DC electric field, the cations move toward the cathode, and the anions move toward the anode and enter the adjacent concentrated water chamber through the ion exchange membrane respectively, thus reducing the ion content in the water of the freshwater channel and achieving the purpose of water purification.

Product Features

Concentrated and Electrolyte Water Chamber Resin Fully Filled

The conductivity of resin is better than that of the solution, which significantly improves the current efficiency, and the voltage is lower for the same current operation. At the same time, it reduces the internal resistance of the EDI module, eliminates the need to add salt to the concentrated and electrolyte water chamber, and avoids the generation of chlorine gas in the electrolyte water chamber.

Counter-Current Water Intake, Different Concentrated and Fresh Water Flow Directions

Counter-current EDI process has a minimal concentration difference and high hardness removal. Also, the opposite direction of concentrated and freshwater reduces the tendency to scale in the concentrated water area. At the same time, the broad flow channel design makes the feed water quality wider, and the feed water hardness can be as high as five ppm.

Three-Inlet and Three-Outlet Water Inlet and Outlet Design

The independent water circuit is suitable for monitoring and protecting the module. The concentrated water flowing upward is ideal for discharging CO2; the electrolyte water flowing upward is suitable for releasing H2 and Cl2 to prevent dry burning. The positive and negative poles are independent to avoid internal gas mixing

Auxiliary Special Power Supply and Flow Protection Switch

Configure a high-frequency power supply, low ripple coefficient, high efficiency, and more energy saving. When the flow rate of the EDI module is too low, the special permanent magnetic switch can realize accurate protection. When multiple EDI modules form an EDI system, each EDI module corresponds to a DC power supply and is equipped with a voltmeter and ammeter, which can realize the independent adjustment of voltage and current.

Simple Installation and Maintenance, Low Operating Cost

Flat design, modular installation, easy operation, fully automatic operation. Compared with the traditional EDI operating current is 4~5 times the effective current, the CP series EDI operating current is only 1.5~2.0 times the effective current, and the operating voltage is only about 1/3 of the traditional EDI operating voltage. Hence, the power required for desalination is only 1/10 of the conventional EDI. Furthermore, considering that the CP series EDI does not need to add salt to the concentrated and electrolyte water and does not need the concentrated water circulation, it not only simplifies the system but also makes the operating cost only about 1/20 of the traditional EDI operating cost.

Product Technical Parameters

EDI Feed Water Index
Total exchangeable anions (Calculated as CaCO₃)	≤35mg/L	Total hardness (Calculated as CaCO₃ )	≤1mg/L
TOC	≤0.2mg/L	CO₂	≤10mg/L
SiO₂	≤0.5 mg/L	Water temperature	5~35°C
Residual chlorine in influent	≤0.02 mg/L	SDI₁₅	<1
pH value	7~9	Variable metals	Fe≤0.01 mg/L, Mn≤0.01 mg/L
Feed water pressure	≤0.4MPa	Oxidizing agent (Cl₂/O₂)	Non-detectable

Product Specification Selection

Model number	CP-5800S	CP-4500S	CP-3600S	CP-2000S	CP-1000S	CP-500S
Size (mm)	616 x 296 x 797mm	616 x 296 x 648mm	616 x 296 x 512mm	616 x 296 x 395mm	616 x 296 x 295mm	616 x 296 x 215mm
Net Weight (kg)	160kg	130kg	110kg	80kg	68kg	58kg
Product water flow (m³/h)	5.0~6.5	4.0~5.1	3.0~3.8	2.0~2.6	1.0~1.5	0.5~0.7
Concentrated water flow (m³/h)	0.50~0.65	0.4~0.51	0.3~0.38	0.2~0.26	0.1~0.15	0.05~0.07
Electrolyte water flow (L/h)	60L/h
DC power	CB-500	CB-500	CA-350	CA-350	CA-350	CA-150
Operation voltage (V)	100~450	80~300	50~240	50~160	20~100	20~80
Operation current (A)	0.5~5.5a