Electrodeionization is the chemical-free process in which ions are removed from water via electric potential. Ions are forced from the dilute compartments into adjacent reject compartments resulting in high purity water. This electric potential also constantly regenerates the resin in the module rather than conventional ion exchange units which use acid and caustic to regenerate. EDI currently designed to polish RO permeate (product).

EDI is a continuous process and the only thing you need is electricity to regenerate the resin. Conventional ion exchange is a batch process which requires large vessels filled with resin, acid/caustic injection systems, a waste neutralization system and all associated controls. Such chemicals can be costly, hazardous, requires permits and special environmental concerns, and typically requires more space than the equivalent EDI system.

Hydrocompus provides EDI (electrodeionization) or CDI (continuous electrodeionization) process purifies water using electricity to regenerate ion exchange resin.  This technology eliminates the hazardous acid and caustic required in chemically regenerated mixed bed ion exchange.  When a DC current is applied to the device, two operations occur similtaneously:

1.  The ion exchange resin is continuously regenerated.      2.  The dissolved solid containments are continuously           removed and rejected, resulting in Ultra pure water.

The benefits of using EDI are:

• Continuous operation - no need to shut down the system for regeneration.
• No hazardous waste stream.
• No waste neutralization.
• Ultra pure water with no hazardous chemicals.
• Continuous product water with consistant product.