EDI pure water equipment principle and technical advantages

EDI In pure water equipment EDI is a pure water production technology that combines ion exchange technology, ion exchange membrane technology, and ion electro-migration technology. It cleverly combines electrodialysis and ion exchange technology, using high voltage at both ends of the electrodes to move charged ions in the water, and using ion exchange resin and selective resin membranes to accelerate ion movement and removal, thereby achieving the purpose of water purification. In EDI the desalination process, ions are removed by ion exchange membranes under the action of an electric field. At the same time, water molecules generate hydrogen ions and hydroxide ions under the action of the electric field, and these ions continuously regenerate the ion exchange resin to keep the ion exchange resin in good condition.
EDI The membrane stack consists of a certain number of units sandwiched between two electrodes. Within each unit, there are two different chambers: a freshwater chamber for desalination and a concentrate chamber for collecting the removed impurity ions. The freshwater chamber is filled with a mixture of cation and anion exchange resins, which are located between two membranes: a cation exchange membrane that only allows cations to pass through and an anion exchange membrane that only allows anions to pass through.
　　EDI The device is a mature technology applied after the reverse osmosis system, replacing the mixed ion exchange bed. It has the advantages of stable water quality, low operating cost, convenient operation and management, small footprint, and no harmful wastewater discharge.

EDI Technical advantages of pure water equipment:
　　1 Continuously produces ultrapure water, the effluent water quality has good stability, and produces ultrapure water with high yield ( The yield can be as high as 95%
　　2 No need for acid-base dilution and transportation facilities and acid-base reserves ;
　　3 Safe and reliable to use, avoiding human contact with acids and bases ;
　　4 Modular production, realizing full automatic control of the equipment ;
　　5 Compact equipment structure, small size, small footprint ;
　　6 No acid-base regeneration is required, and there will be no downtime due to regeneration ;
　　7 Saves backwashing and cleaning water, no regeneration wastewater, no wastewater treatment equipment is required ;
　　8 Easy and convenient installation, low installation cost ; Reduce equipment operating and maintenance costs ;
　　9 Simple equipment operation, low labor intensity.

EDI Module startup method:

　　In the water leak check before power supply, as much water as possible is allowed to pass through the module. The more water that passes through, the longer the regeneration process will be during startup.

　　1 All mechanical, water, and electrical connections should be completed.

　　2 Prepare data tables and operation logs to record the initial data and currently observed phenomena.

　　3 Slowly add water to the system to expel air. Pulse feed water to the concentrate water, pure water, and ultrapure water pipes to further expel air from the water pipe system. The piping should not have any dead corners that can trap air. Removing air during startup is important because some air in the module will prevent the components from getting the normal water flow.

　　4 Check and repair the pipeline leaks.

　　5 Start the power supply as soon as possible. If excessive water is sent to the module before power-on, the system will need a longer time to regenerate the module.

　　6 Check and adjust the ultrapure water, concentrate water, and pure water to the design range.

　　7 Check whether the pressure loss of ultrapure water, concentrate water, and pure water is approximately correct, and check whether the pure water outlet pressure is greater than the concentrate / water inlet pressure.

　　8 Check the initial current of the components, the initial current should be higher than the normal operating current. The current will drop to the normal value within one hour.

　　9 Check all switches and flow sensors to ensure that the settings are correct and the correct signals are sent to the control center.