Reverse Osmosis Membrane Lab Report

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Various models and mechanism for the solvent and solute transport through reverse osmosis membrane have been developed and proposed by a number of investigators. The flow of solvent through the membrane is defined in terms of flux: The solvent flus of the permeate depends on the hydraulic pressure applied across the membrane, minus the difference in the osmotic pressure of the solutions of the feed and permeate side of the membrane. While the solute flux depends on the concentration gradient The membrane rejection is defined as the difference between the feed concentration and permeate concentration From the solvenr and soIute flux Eqs. it can be shown that the rejection is the function of pressure and…show more content…
(21) we need the relationship between Q!, and C,> with the expression for c’, in terms of CL, To achieve this we have to get the relationship between osmotic pressure and feed concentration, which is done through the v$an’t Hoff‘expression Eq. (22) shows that the osmotic pressure of solution increses with the increasing concentration and temperature directly. The osmotic pressure coefficient must be determined for different solutions. It has been determined by various researchers to be less than unity and slightly increases with increasing solution concentration if the solute is not known or it is complex, wc have to use mass concentration instead of molar concentration. For convenience: this model assumed a constant temperature and incorporated the other constant Y which simplifies osmotic pressure to solute concentration coefticient. The value of Y was assumed t-o be constant over the operating range of the solute concentration. In corporation of Eq. (23) into the expression for the solute flux Eq. (2) yields: Combining the above equations. we get: Approximating the equation through high

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