Abstract
In designing a continuous (single pass) electrodialysis plant to desalt water from a sea water salinity of 35,000 ppm to less than 4 ppm, or approximately 10,000 fold reduction in concentration, the number and mix of hydraulic and electrical stages are key design variables to maximize the cut achieved by each electrodialysis stack and therefore to minimize the number of stacks in the plant. The total number of stages in the plant and the flow rate per stage determine the plant's specific production while the pressure drop per stage sets the requirement for interstage pumping. The number of electrical stages limits the total current density applied and also determines the specific energy consumption of the plant. The design analysis is applied, using experimental data, to a plant application requiring minimum investment and simplified plant operation.
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