A series of tests was performed to evaluate the operating character¬istics of a duplex deionization system under high flow rate conditions. The results indicate that flow rates substantially higher than those currently recommended are feasible using filtered Columbia River water as the system influent.nDuplex systems (cation exchanger followed by an anion exchanger) have been tested at flow rates of 10, 25, 50 and 75 gallons per minute per square foot of cross-sectional area. System operating lifetimes of 21.5, 8.5, 4.0 and 2.2 hours respectively were obtained at these conditions using four-foot-deep resin beds. The average effluent specific resistance ranged between 4x105 and 8 x 105 ohm-centimeters during these tests. In every case, anion leakage (predominantly silica) indicated the initial breakthrough.
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