Electrodialysis polarization parameter

The data in Figure 8.16 show the results of an experiment to determine the values of i jm. Those data were obtained from electrodialysis of a solution of NaCl in a stack containing ten cell pairs.21 The applied voltage, current, and pH of the depleted product water were monitored. A control experiment with one cell pair in the stack was used to determine the voltage drop attributable to the electrodes and rinse streams. The cell-pair resistance, Rcp = (Vapp - V ec) x Acp/I, was observed to increase slightly for moderate increases in the polarization parameter, i/N. [The polarization parameter is defined as the current density, i = l/Acp, divided by the log-mean concentration of the depleting stream, N = (C n - Cout)/ln(Cjn/Cout).]... 

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