Osmotic Pressure - Reverse Osmosis Systems Print E-mail

Osmotic Pressure - Osmotic pressure is the pressure required to prevent the flow of water across a semi-permeable membrane separating two solutions having different ionic strengths. For reverse osmosis systems it is the osmotic pressure that has to be overcome in order to produce permeate. A useful “rule of thumb” is for every 100 mg/L of TDS difference between feed and permeate, 1 psi of osmotic pressure exists.

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