MIT EDI
Water enters the EDI module after passing through a reverse osmosis (RO) system, which removes most of the dissolved solids.
Electrodeionization is a chemical-free water purification technology that combines:
- Ion exchange resins
- Ion-selective membranes
- Direct current (DC) electricity
Together, these components continuously remove dissolved ions from water, producing ultrapure water with resistivity levels often exceeding 15–18 MΩ·cm—ideal for industries like semiconductors, pharmaceuticals, power generation, and laboratories.
How It Works
Water enters the EDI module after passing through a reverse osmosis (RO) system, which removes most of the dissolved solids. The EDI unit then performs the final polishing:
- Ion exchange resins capture remaining cations and anions.
- DC electricity drives these ions across ion-selective membranes into adjacent concentrate chambers.
- The resins are regenerated in-line, continuously, without the need for acid or caustic chemicals.
This seamless process ensures stable, high-purity output—without the environmental impact of traditional mixed-bed ion exchange systems.
Benefits:
- Chemical-free regeneration: No need for hazardous acid or caustic
- Continuous operation: No downtime for resin replacement
- Compact footprint: Ideal for modular and skid-mounted systems
- Environmentally friendly: Reduces chemical waste and discharge
- High reliability: Stable output with minimal operator intervention.
Applications:
- Microelectronics: where even trace minerals can damage circuits
- Pharmaceuticals: ensuring sterile, contaminant-free formulations
- Power plants: feeding high-pressure boilers with mineral-free water
- Laboratories: supporting sensitive analytical procedures