EDI System

EDI (Electrodeionization) systems combine ion exchange membranes, ion exchange resin, and an electric field to continuously produce ultra-pure water with resistivity up to 18.2 MOhm-cm without chemical regeneration. This makes EDI the preferred polishing step after RO for applications demanding the highest water purity. Our EDI modules operate at 90-95% water recovery with power consumption of 0.5-1.0 kWh/m3, offering a compact, environmentally friendly alternative to traditional mixed-bed ion exchange.

Key advantages:

• Output water resistivity: 15-18.2 MOhm-cm (ultra-pure grade)

• No acid or caustic regeneration chemicals required

• Continuous operation with no regeneration downtime

• Compact footprint saves 30% space vs. mixed-bed ion exchange systems

• Modular stack design for easy capacity scaling and maintenance

Typical applications: Semiconductor manufacturing, pharmaceutical water systems (USP/EP grade), power plant boiler feed, laboratory water, fine chemical production

FAQ:

Q: Does EDI replace ion exchange completely?

A: EDI eliminates chemical regeneration of the polishing stage, but RO pretreatment is still required to feed low-TDS water to the EDI stack.

Q: How long do EDI modules last?

A: Typical service life is 3-5 years depending on feed water quality and operating conditions.

Contact our water treatment engineers to design an RO-EDI system tailored to your purity requirements and production capacity.