Prerequisites for Daily Maintenance of EDI Module

The daily maintenance of the EDI module is crucial for ensuring the efficient operation of the equipment, extending its lifespan, and guaranteeing the continuous production of high-purity water that meets standards. System failures and performance degradation can be effectively prevented by regularly monitoring system performance, cleaning and maintaining key components, timely replacing consumables, and performing preventive cleaning, thereby avoiding production interruptions and reducing maintenance costs. In addition, good maintenance practices also contribute to improving the reliability and efficiency of the entire water treatment process, ensuring compliance with stringent industrial and environmental standards.

For the following reasons, the EDI module needs to be cleaned and disinfected on time:

• Due to hardness scale, mainly occurs in the concentrated water chamber
• Inorganic and organic matter fouling of ion exchange resin and membrane
• Microorganism contamination of EDI module, system pipelines and others
  • When the mineral content in the feed water exceeds the design value or the recovery rate exceeds the design value, it will cause the concentrated water chamber to scale. Because dirt accumulates over time, even if the concentration is low and the contact time is short, there is still the possibility of scaling. Silicon scaling is usually difficult to remove, but it is easy to remove it through pickling. Using low pH solution to circulate in the system, can remove the scaling in the concentrated water chamber.
  • When the feed water is high in iron and manganese, or the water with high TDS (total soluble solid content in water) is into EDI module accidentally. The ion exchange resin of the fresh water chamber will cause an inorganic pollution. Since this phenomenon may occur in the concentrated water chamber, it is recommended to clean all chambers of the EDI module.
  • When the content of organic matter in the feed water exceeds the design standard, the ion-exchange resin in the fresh water chamber will have organic fouling. The organic molecules can be removed from the ion-exchange resin with a high pH brine circulation. Using the same solution cycle can also remove the organic contamination of the concentrated water chamber.
  • When the environment is suitable for microorganism growth, or when bacteria and algae exist in the water, the EDI module and system components will occur bio pollution. Equipment should be sterilized to remove biological contamination before pollution becomes serious.
  • If the EDI module operates under the condition of power failure or insufficient power supply, the ions in the module will be in a saturation state, and the water quality will be reduced. In order to regenerate the ion exchange resin, make the water flow pass through the component, and slowly increase the power supply voltage, so that the adsorbed ions migrate out of the system. When the resin is regenerated, the module should be operated under high current and low water flow.