RO EDI Water Treatment System

An RO EDI Water Treatment System is an advanced, multi-stage purification setup that combines Reverse Osmosis (RO) with Electrodeionization (EDI) to produce high-purity or ultrapure water. This integrated system is the modern standard for industries that require water with near-zero conductivity without the environmental burden of chemical resin regeneration.

The system follows a specific sequence where the RO stage handles the bulk filtration and the EDI stage provides the final "polishing":

1. Pre-Treatment: Water passes through multimedia and carbon filters to remove sediment and chlorine, protecting the RO membranes from physical and chemical damage.
2. Reverse Osmosis (RO) Stage: High-pressure pumps force water through semi-permeable membranes, removing 95–99% of dissolved salts, organics, and bacteria. For high-end systems, a Double-Pass RO configuration is often used to provide even cleaner feed water to the EDI module.
3. Electrodeionization (EDI) Module: The "permeate" from the RO stage enters the EDI unit. Inside, an electric field continuously migrates ions through selective membranes and ion-exchange resins.
4. Self-Regeneration: Because the electric field splits water molecules into $H^+$ and $OH^-$ ions, the resin is constantly "recharged" electrically, eliminating the need for acid or caustic soda washes.

Using these two technologies together offers significant operational benefits over traditional demineralization plants:

• Continuous Operation: Unlike standard ion exchange tanks that must be taken offline for chemical regeneration, EDI produces high-purity water 24/7 without interruption.
• Chemical-Free & "Green": The system uses electricity instead of hazardous chemicals, making it safer for operators and significantly easier to permit for environmental compliance.
• Consistent Water Quality: Because the resin is regenerated in real-time, there are no "swings" in water quality that typically occur at the end of a traditional resin bed's cycle.
• Compact Footprint: RO EDI systems are typically skid-mounted and much smaller than older, massive chemical deionization plants.

• Pharmaceuticals: Producing "Purified Water" (PW) and "Water for Injection" (WFI) that meets strict pharmacopeia standards.
• Power Generation: Providing ultra-pure feed water for high-pressure boilers to prevent scale and turbine corrosion.
• Microelectronics: Rinsing semiconductor wafers where even a single ion can cause a manufacturing defect.
• Bioengineering: Creating sterile, chemically inert bases for cell cultures and genetic research.

1. Modular design, fully automatic control.

2. Pretreatment RO membrane and EDI module can be automatically washed.

3. Different modules will automatically switch to self-circulation mode, which guarantees no dead water exists.

4. Low pressure switch is equipped to protect the high pressure pump form damage in case of water cut.

5. Water quality monitoring system continuously showing out the output water quality to prevent production loss from unqualified water.

6. Pressure monitoring system is equipped to RO membrane to figure out the washing time for RO membrane.

7. Water tank is equipped with liquid level controller.

8. Top brand pump, gauge and RO membrane.

To design the right RO EDI Water Treatment System for you, please tell me:

1. Industry (pharma, power, electronics, chemical, biotech, etc.)
2. Required flow rate (LPH or m³/hr)
3. Raw water source & TDS
4. Required standard (PW, boiler feed, ultrapure, etc.)

I can then suggest the exact RO–EDI water treatment system configuration and capacity for your application.

 

 

a.We provide full technical support and after equipment installation.
b.We help to train operator of the system. And detailed operating manual is provided.
c.7*24 hours phone assistance on technical support.
d.We provide consumable and spare parts in the long-term for cost price.

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