ELECTRODEIONIZATION (EDI)

What is EDI?

For the production of high purity water, mixbed ion exchange systems are traditionally used behind reverse osmosis membranes. . EDI is a process that is produced by laminating an ion exchange resin on a membrane, providing a highly efficient demineralization process.

While electrodeionization regenerates continuously by applying DC electric current, it separates ions with a specially prepared membrane that is semi-permeable. .

Electric current is used to continuously renew the resin, eliminating the need for periodic regeneration.

The EDI process produces very high purity industrial process water using less than 95% of the chemical products used in traditional ion exchange processes. With the EDI process, a very high amount of regenerant (acid-caustic) is saved compared to traditional ion exchange processes.

Apps

EDI is useful for any application aimed at continuous and economical demineralization without the use of hazardous chemicals. Some examples:

Reuse of water in the food and beverage industry
Chemical production
Biotechnology
Electronic
Cosmetic
Laboratories
Pharmaceutical industry
Boiler feed water
SiO2 and TOC reduction (total organic carbon)

Application Areas

Replacing the traditional ion exchange process, EDI provides advantages in both energy and operating costs for high purity water treatment. It eliminates the need for periodic regeneration of the ion exchange resin, eliminating the environmental effects of acid and caustic regeneration wastewater.

Some of the advantages of EDI over traditional ionic exchange systems include:

Simple and continuous operation
There is no chemical consumption for regeneration.
Cost effective operation and maintenance
Low power consumption
Does not create any pollutants, safety and reliability
It requires very few automatic valves or complex control systems that need supervision by an operator.
Requires very little space
Produces highly pure water at a constant flow
Provides complete removal of dissolved inorganic particles.
In combination with Reverse Osmosis pretreatment, it removes more than 99.9% of ions from water.