Articles

Eco-Tec's first Triflo‚ Deionization System started up in late August 2002 at WE Energies' (Wisconsin Electric Power Company) Pleasant Prairie Power Plant in Kenosha, Wisconsin. The supply water is pumped from Lake Michigan into a settling pond and through two Eco-Tec Spectrum Micro Media Filters. The filtered water is then pumped through the Eco-Tec three-bed cation/anion/cation Triflo System. Plant staff are pleased with the treated water quality; conductivities are consistently lower than the maximum 0.1 microSiemens/cm target.

The Recoflo TriFlo Demineralizer produces the very high purity water (i.e. conductivity of less than 0.1 microsiemens/cm) often required to feed critical and super critical boilers. It can do this economically and simply in a single process unit from feedwaters containing up to 450 ppm of total dissolved solids.

Basic Principle

The standard two-bed Recoflo demineralizers with short, compressed beds of fine mesh resin, using counter current regeneration produces water purity in the range of 1.0 - 0.15 microsiemens-cm conductivity (1-6.7 megohm/cm resistivity) from a wide range of feedwater purities. The inability to produce much higher purity water is limited by the presence of sodium ions that have either slipped off the cation resin, or remain in trace amounts in the anion bed after regeneration with caustic. Ultra-pure water can be achieved by simply adding an additional cation resin bed as a polisher after the usual two-bed demineralizer to remove the contaminating sodium ions.

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