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Sketch of the batch (on the left) and continuous (on the right) experimental systems. (a) balances, (b) peristaltic pumps, (c) Diffusion Dialysis units, (r) retentate buffer, (d) diffusate buffer, (f) feed tank, (w) deionized water tank, (P) pressure meter. The arrows denote the osmotic flux (Jos), the drag flux (Jdr) and the i-component flux (Ji) across the membrane.
