Electrodeionization is a process where water is deionized using electric current, ion-exchange membranes and resin. Electrodeionization is used for the final polishing of water after the reverse osmosis stage when there is a need for very low conductivity of the water (below 0.1 μS/cm). Very low conductivity water is required, examples include for steam turbines in electric power plants and in the production of various semiconductor components like production of solar panels).
An Electrodeionization system consists of an encased unit containing ion-selective membranes and mixed bed ion-exchange resin, a DC power supply unit and piping with the necessary regulators and sensors to control the flow of water within the unit.
Within the Electrodeionization cell, the water is divided into final product water (dilute), concentrate and electrolyte (the residue water streams that include filtrated substances). The concentrate and electrolyte can be collected and re-used elsewhere in the process. Typically, the yield is 90 – 95% with Electrodeionization.
This Electrodeionization skid produces 200 GPM of high purity water for a steam turbine operating in the Middle East.
Electrodeionization (EDI) water treatment technology removes not only residual salts but ionizable aqueous contaminants, like carbon dioxide, silica, ammonia, and boron. The systems operate chemical-free and consume only electricity. Haliant Technologies Electrodeionization systems provide key advantages over traditional ion exchange resin processes by using less energy consumption while yielding more ultrapure water.
Traditionally with ion filtration units, the pollutants and particles which get sorted out are trapped in the resin pores, leading to chronic buildup, and reducing filtration force. With an Electrodeionization system from Haliant Technologies, the particles that are filtered through the membrane get entirely removed from the device by a consistent waste stream.
Ultra™ brand Electrodeionization (EDI) systems from Haliant Technologies provides the right combination of value and features required for any high-purity application. Every Ultra™ EDI is manufactured from the highest quality components to the exacting standards of all Haliant Technologies equipment. Standard Ultra™ EDI models are available for any high-purity application from 1500 to over 150,000 GPD.
20 GPM Electrodeionization unit for semi-conductor manufacturing