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The effect of flow rate on permeate water quality: When the feed water flow rates were 60, 80, 100, and 120 L/h, the conductivity of the EDI effluent varied with the operating current. It can be seen that the conductivity of the EDI effluent changed very little with the operating current at different feed water flow rates. This is because, in the circuit, the solution phase and the resin phase in the dilute chamber are connected in parallel. Since the conductivity of the ion exchange resin is much higher than that of the electrodialysis permeate, the resin phase resistance becomes the determining factor for the dilute chamber resistance. Ion transport mainly occurs through the resin phase, and within a certain range of dilute water flow rates, the flow rate has little effect on the resin phase resistance. Therefore, the total current of the membrane stack does not change significantly, and the permeate conductivity changes very little. Thus, the feed water flow rate has little effect on the degree of water dissociation.
