Root Causes of EDI Module Failures
EDI modules are a type of pure water manufacturing technology that combines ion exchange technology, ion exchange membrane technology, and ion migration technology. It cleverly combines electrodialysis and ion exchange technology, using high voltage at both ends to move charged ions in water, and with the help of ion exchange resins and selective resin membranes to accelerate ion removal, thus achieving water purification. In the EDI desalination process, ions are removed through ion exchange membranes under the influence of an electric field. At the same time, water molecules produce hydrogen ions and hydroxide ions under the electric field, which continuously regenerate the ion exchange resin, allowing it to maintain its state.
Main Causes of EDI Module Failures:
1. Improper system maintenance management, failure to comply with EDI usage conditions.
2. Current and voltage exceed rated values or human error.
3. EDI module not cleaned and maintained for a long time, resulting in calcium and magnesium scale buildup on the membrane and channels, increasing the pressure difference between inlet and outlet water, leading to decreased water quality, increased voltage, and unadjustable current, ultimately rendering it unusable.
4. EDI module running at high current and low flow for a long time, causing accumulated heat to not dissipate, leading to overheating and deformation of membranes near the electrodes, increasing the pressure difference of the concentrated water, and varying degrees of decline in both water quality and quantity.
5. When the EDI system is manually operated, powering on in a water shortage state directly leads to overheating and carbonization of the membrane and resin, making cleaning ineffective and rendering it unusable.
6. Using unreasonable cleaning and disinfection agents directly leads to damage and fragmentation of EDI resin, increasing the pressure difference between inlet and outlet water, resulting in a decline in both water quality and quantity.
7. EDI module not cleaned and maintained for a long time or long-term shutdown without protection, leading to the growth of organic matter on the membrane and channels, increasing the pressure difference between inlet and outlet water, resulting in decreased water quality, increased voltage, and unadjustable current, ultimately rendering it unusable.
8. No safety filter before the EDI inlet, directly leading to foreign objects blocking the EDI channel, increasing the pressure difference between inlet and outlet water, resulting in a significant decrease in water quantity, ineffective cleaning, and poor pretreatment (softeners, sulfite addition systems, RO, etc.), control system faults/malfunctions (safety interlock devices, low flow protection issues), and inappropriate system design (initial RO produced water not discharged) etc.
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