Wood Gifford White Paper: Improvements in Continous Electrodeionization (CEDI) Module Design

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Arsenic Removal - Experience with the GEH Process in Germany

Author            :Dr. Wolfgang Driehaus

Designation    :Germany

Company        :GEH Wasserchemie GmbH & Co. KG

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Synopsis

The conventional means of purifying boiler feed water has been to use chemically regenerated ion-exchange deionization. This is a widely accepted technology that has been in use for half a century but has the disadvantage of requiring the use of hazardous chemicals for regeneration for the ion exchange resins. Ion exchange also produces a considerable amount of chemical waste, which requires neutralization before it can be discharged.
Over the past decade the power industry has increasingly relied on the use of reverse osmosis (RO) as a roughing demineralizer to remove the bulk of the mineral, organic and particulate contaminants, and reduce the chemical consumption of the ion exchange system. In the past few years, improvements in continuous electrodeionization (CEDI) technology have caused a movement towards chemical free deionization systems, as RO/CEDI has become more cost competitive with conventional ion-exchange technology. Another reason for incorporation of the RO/CEDI process is that it offers better removal of colloidal silica and dissolved organic matter than conventional deionization.
Recent advances in electrodeionization module construction have led to further cost reductions both at the module and system level. For instance, incorporation of an ion exchange resin filler in the concentrate compartments has allowed for elimination of both the concentrate recirculation pump and brine injection system that is often used to increase water recovery and reduce module resistance.
In addition to describing the recent advances in electrodeionization technology, this paper will teach how to design an RO/CEDI system for reliable production of feed water for high-pressure boilers.

*Previously presented at the Industrial Water Conference (2002), and in Power Engineering magazine (Sept., 2003)

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