Electrodeionization EDI is an electrically-driven water treatment technology that uses electricity, ion exchange and resin to remove ionized species from water. The combination of ion-exchange resins and ion-exchange membranes, which are used to move ionic impurities into a waste or concentrate water stream leaving purified product water. As impurities leave via the concentrate water system, their build-up does not exhaust the resin and therefore prolongs resin lifespan. A single EDI unit may operate for many years before a replacement is required. This technology can be used as an alternative to single-use purification cartridges.

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We'd like to understand how you use our websites in order to improve them. Register your interest. Increasing pollution of ecosystems is calling for sustainable methods to remove pollutants.

In particular, electrodeionization has recently emerged as an efficient technique to remove ionic compounds from contaminated waters. Electrodeionization is thus safer than classical treatments with acids, bases and other chemicals.

Electrodeionization produces highly pure water, allows efficient ion removal and does not require chemicals for resin regeneration. Electrodeionization for water purification overcomes limitations of resin beds for ion exchange, particularly the release of ions as the beds exhaust. Applications include the removal of toxic chemicals, radioactive pollutants, heavy metal ions and corrosive anions; the regeneration of valuable metals; the deionization of water and the removal of nitrates.

Continuous electrodeionization requires performance optimization and modification of the stack configuration. This article reviews principles and applications of ion removal, transport and reaction mechanisms, and factors controlling the efficiency.

This is a preview of subscription content, log in to check access. Rent this article via DeepDyve. Desalination 1—3 — Chem Eng J — Electrochim Acta — Ind Eng Chem Res — Allison RP Electrodialysis reversal in water reuse applications. Desalination 1—2 — Alvarado L, Chen A Electrodeionization: principles, strategies and applications. Desalination 1 — Alvarado L, Torres IR, Chen A Integration of ion exchange and electrodeionization as a new approach for the continuous treatment of hexavalent chromium wastewater.

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We'd like to understand how you use our websites in order to improve them. Register your interest. Increasing pollution of ecosystems is calling for sustainable methods to remove pollutants. In particular, electrodeionization has recently emerged as an efficient technique to remove ionic compounds from contaminated waters.


Electrodeionization theory, mechanism and environmental applications. A review

Electrodeionization EDI is a water treatment technology that utilizes electricity, ion exchange membranes and resin to deionize water and separate dissolved ions impurities from water. It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a polishing treatment to reverse osmosis RO. There are also EDI units that are often referred to as continuous electrodeionization CEDI since the electric current regenerates the resin mass continuously. CEDI technique can achieve very high purity, with conductivity below 0. Recently, Argonne National Laboratory developed a process called Resin-Water Electrode ionization RW-EDI , which uses a unique porous resin wafer mold made from immobilized loose ion-exchange resin beads. The resin wafer material enhances mass transfer between solid resin bead and liquid feed solution phases to achieve a high purity, especially when treating impaired or [1] brackish water. In order to eliminate or minimize the concentration polarization phenomenon present in electrodialysis systems, electrodeionization originated in the late s.


Electrodeionization (EDI)

What is EDI? High purity water production has traditionally used a combination of membrane separation and ion exchange processes. EDI is a process which combines semi-impermeable membrane technology with ion-exchange media to provide a high efficiency demineralization process. Electro dialysis employ electrical current and specially-prepared membranes which are semi permeable to ions based on their charge, electrical current, and ability to reduce the ions based to their charge. Through electro dialysis an electrical potential transports and segregates charged aqueous species.


Electrodeionization EDI is a continuous process that utilizes an applied current to remove ionized and ionizable species from a water source while continuously regenerating the ion exchange media. Ions are transferred to concentrate chambers by the use of cationic and anionic semi-permeable membranes and flushed out of the module through a continuous waste stream. Dilute product water moves through the dilute chamber and out of the module. An on-skid rectifier will apply a voltage to remove dissolved impurities. EDI typically follows a single or double pass reverse osmosis system RO. With more than 40 years of water treatment experience, our complete process knowledge, and our dedication to customer service, we offer the best and most complete high purity treatment solutions to meet your needs. In order to provide a more complete solution for power systems, WesTech has added electrodeionization and ion exchange technologies, with a focus on boiler feed water makeup.

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