Reverse OsamosisA Obtaining pure water from water containing a salt, as in desalination.
Pure water and the salt water are separated by a semipermeable membrane and the pressure of the salt water is raised above the osmotic pressure, causing water from the brine to pass through the membrane into the pure water. This process requires a pressure of some 25 atmospheres, which makes it difficult to apply on a large scale. TankPressure 8-9 psi
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MembraneThe membrane assembly consists of a pressure vessel with a membrane that allows
feedwater to be pressed against it. The membrane must be strong enough to withstand whatever pressure is applied against it. RO membranes are made in a variety of configurations, with the two most common configurations being spiral-wound and hollow-fiber. |