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physicochemical process > osmosis > reverse osmosis

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reverse osmosis  

Definition

  • A method of 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.

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URI

http://www.eionet.europa.eu/gemet/concept/7204

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