The root cause of the EDI module malfunction

Trigger Root cause of EDI module failure

   EDI The module 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 During 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 maintain the state of the ion exchange resin.

Cause The main causes of EDI module failure:

1. Improper system maintenance management, failure to comply with EDI operating conditions.

2. Current and voltage exceed rated values or manual misoperation.

3. The EDI module has not been cleaned and maintained for a long time, EDI The membrane and channel are scaled with calcium and magnesium, the inlet and outlet water pressure difference increases, resulting in a decrease in the quality of the produced water, an increase in voltage, and an inability to adjust the current, and finally it cannot be used.

4. The EDI module runs at high current and low flow for a long time, and the accumulated heat cannot be dissipated, resulting in EDI The membrane near the two poles is heated and deformed, EDI The concentrate pressure difference increases, and the water quality and water quantity decrease to varying degrees.

5. When the EDI system is manually operated, energizing in a water shortage state directly leads to the heating and carbonization of the membrane and resin, which is ineffective for cleaning and cannot be used.

6. Using unreasonable cleaning and disinfection agents directly leads to Damage and breakage of EDI resin, increased inlet and outlet water pressure difference, resulting in a decrease in the quality and quantity of produced water.

7. The EDI module has not been cleaned and maintained for a long time or has been shut down for a long time without protection, EDI The membrane and channel breed organic matter, the inlet and outlet water pressure difference increases, resulting in a decrease in the quality of the produced water, an increase in voltage, and an inability to adjust the current, and finally it cannot be used.

8. There is no safety filter before the EDI inlet water, which directly leads to foreign objects blocking the EDI Channel, the inlet and outlet water pressure difference increases, resulting in a serious decrease in the amount of produced water, ineffective cleaning, and poor pretreatment ( Softener, sulfurous acid addition system, RO etc. ) Control system failure / Failure ( Safety interlock device, low flow protection problems ) Inappropriate system design (RO Initial produced water not discharged ) etc.