Trionetics, Inc.

Electrodeionization

Electrodeionization (EDI) works exactly like conventional DI systems, using ion exchange resin to remove both cations and anions from water to produce ultrapure water for details on ion exchange and conventional DI systems). The difference lies in how the ion exchange resin is regenerated. Rather than using chemical concentration, an electric current is used to remove contaminant ions and create ions to regenerate the resins. This leads to considerable savings in operating costs since chemicals no longer have to be purchased nor disposed of.

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The basic building block for EDI systems is the EDI Stack shown at left. It is called a stack because it consists of alternating layers of ion exchange resins and ion specific membranes. The ion exchange resins actually remove contaminant ions from the wastewater stream, while the ion specific membranes allow trapping the contaminant ions to prevent them from recontaminating the resin after they are removed with an electric current .

The basic EDI Stack is capable of treating 12.5 GPM. Increasing capacity is as simple as plumbing multiple EDI Stacks in parallel.

25 GPM EDI System
25 GPM
100 GPM EDI System
100 GPM
150 GPM EDI System
150 GPM

Trionetics is an authorized integrator of GE E-CellTM EDI modules. You may gather further information about them at www.ecell.com. We design and build systems using this technology.


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Last updated 3-22-07