Electro Deionization Systems

Electro Deionization is a water treatment technology that has gained popular acceptance because the process does not use chemical treatments. In such a system, there are no moving parts. Water is passed between a positive electrode and a negative electrode. Semi permeable ion-exchange membranes separate the positive and negative ions, delivering deionized water.

Electro Deionization (EDI) removes ionizable solids from liquids using electrically active media and an electrical potential to effect ion transport. It differs from other water purification technologies such as conventional ion exchange in that it does not require the use of chemicals such as acid and caustic soda. In traditional ion exchange units, after the contaminants are trapped onto the resin pores, the resin continues to exhaust and lost capacity. In EDI, the contaminants are continuously removed as they are attracted to one of the two electrical charges, and they migrate through the resin bed, through ion exchange membranes and into the concentrate stream where they are removed from the device.EDI is a polishing technology and requires reverse osmosis (RO) as pretreatment. The combination of RO-EDI provides the customer with a continuous, chemical-free system.

Electro deionization systems typically have a life cycle of more than five years. The lifecycle of the system can be prolonged based on the pretreated water quality.