Desalination - Reverse Osmosis


Reverse osmosis consists of passing water through semi-permeable membranes using pulse pressure. This process preserves both monovalent and bivalent ions. The removal rate is expressed as a percentage of total salinity. Brackish water is reduced by more than 92% and sea water by more than 98.5%.


Reverse Osmosis operating principle


The design of reverse osmosis systems requires in-depth knowledge of equipment (membranes and reverse osmosis modules) and construction materials, which must be resistant not only to a saline liquid and gaseous environment but also to high pressure.

The main parameters for the design and size of a reverse osmosis system are:


  • the salinity and quality of the feed water,
  • the recovery rate,
  • the water temperature,
  • the working pressure,
  • the quality specifications of the water produced.


The reliability of a reverse osmosis system's operating capability and service life depends on the pretreatment quality throughout the entire system.

Reduced external power consumption and energy recovery

Some of a desalination plant's energy needs can be met by renewable energy sources (wind, tidal and solar power), while operating costs can be reduced and resources conserved by using systems that recover energy from reverse osmosis discharge via Pelton turbines or energy exchangers.


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The reverse osmosis desalination process

[Clarification and filtration] fleche_EP.gif [Reverse Osmosis] fleche_EP.gif [Final treatment]




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