Pure & Ultra-pure Water
Electronic Industry Ultra-pure Water Equipment (EDI)
Continuous electrodeionization systems supplying wafer, PCB, PV and battery plants with chemical-free UPW.
- Capacity
- 0.25 – 50 T/H
- Outlet Quality
- ≥ 15 MΩ·cm continuously, up to 18.25 MΩ·cm with polishing
EDI (electrodeionization) combines ion exchange resin, ion selective membranes and a DC electric field. Ions are captured by the resin and continuously driven through the membranes into the concentrate stream, so the resin is regenerated electrically and never needs acid or alkali.
This makes EDI the standard polishing step for electronics-grade ultra-pure water: it runs continuously, produces constant quality water, and eliminates the chemical storage, handling and regeneration wastewater associated with mixed-bed systems.
Our EDI systems are built as complete skids including second-pass RO feed, degassing, EDI stacks, DC power supply, online instrumentation and the polishing loop, and are matched to the specific resistivity, TOC and particle targets of your process.
Key Features
Why This System Performs
Continuous electrical regeneration
No acid or alkali, no regeneration waste, no downtime for resin regeneration cycles.
Consistent resistivity
Outlet quality stays above 15 MΩ·cm around the clock instead of degrading through a regeneration cycle.
Compact modular stacks
Stacks can be added in parallel as production grows, keeping the initial investment proportional to demand.
Low labour requirement
Fully automatic operation with alarm and interlock logic — no chemical handling personnel needed.
Process
Typical Process Flow
- 01Pre-treatment (multi-media, carbon, softener)
- 02First-stage RO
- 03pH adjustment / degassing membrane
- 04Second-stage RO
- 05EDI module stack + DC power supply
- 06UV 185 nm TOC reduction
- 07Polishing mixed bed
- 080.22 μm / ultrafiltration terminal filtration
- 09Circulating distribution loop
Specifications
Technical Data
| Capacity | 0.25 – 50 T/H |
|---|---|
| Product resistivity | ≥ 15 MΩ·cm, up to 18.25 MΩ·cm |
| Feed requirement | RO permeate, conductivity ≤ 20 μS/cm, hardness ≤ 1 ppm |
| Recovery | 90 % – 95 % |
| DC supply | Constant-current / constant-voltage regulated |
| Piping | PVDF / PP / SUS316L sanitary |
Applications
Related Equipment
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