Double Pass RO System with EDI Module for Ultrapure Water

The reverse osmosis system with an electrodeionization (EDI) module was developed for ultra-pure water production, combining double reverse osmosis with final polishing by EDI.

This solution is ideal for applications requiring very low conductivity and silica levels, offering high water purity, continuous operation, and reduced need for chemical regeneration.

Technical Specifications

• Capacity: up to 50 m³/h
• Produced water quality: up to 18.2 megaohm-cm
• Inlet water TDS: < 50000 ppm
• Control system: automatic

What is a Double Pass RO system?

A Double Pass RO system uses two stages of reverse osmosis. The water produced in the first stage is sent to a second RO unit, further increasing the purity level of the final water.

In certain configurations, there may be an intermediate tank between the first and second pass, allowing for temporary storage and controlled feeding of the second stage.

How does the RO + EDI system work?

In this system, water first undergoes double reverse osmosis to remove most dissolved solids. Then, the EDI module acts as a final polishing stage, removing remaining ions through selective membranes, ion-exchange resins, and electric current.

The result is ultra-high purity water, with low conductivity and silica levels, suitable for critical industrial applications.

Advantages of the RO + EDI system

• Production of ultra-pure water
• High removal of dissolved solids
• Low conductivity and silica levels
• Continuous operation without regeneration downtime
• Reduced need for chemicals
• Ideal for demanding industrial processes

Applications

• Pharmaceutical industry
• Electronics production
• Power plants
• Laboratories
• Industrial processes requiring ultra-pure water

Summary

The Double Pass RO system with an EDI module is an advanced solution for obtaining ultra-pure water, combining high purification efficiency, continuous operation, and superior final quality for high-level industrial applications.