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Desalination is an artificial process by which saline water (generally sea water) is converted to fresh water. The most common desalination processes are distillation and reverse osmosis. [52] There are several methods. [53] Each has advantages and disadvantages but all are useful.
B - Seawater in C - Potable water out D - Brine out (waste) E - Condensate out F - Heat exchange G - Condensation collection H - Brine heater MSF Desalination Plant at Jebel Ali G Station, Dubai. The plant has a series of spaces called stages, each containing a heat exchanger and a condensate collector. The sequence has a cold end and a hot end ...
The solar humidification–dehumidification method (HDH) is a thermal water desalination method. It is based on evaporation of sea water or brackish water and subsequent condensation of the generated humid air, mostly at ambient pressure.
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Schematic of a multiple effect desalination plant. The first stage is at the top. Pink areas are vapor, lighter blue areas are liquid feed water. Stronger turquoise is condensate. It is not shown how feed water enters other stages than the first. F - feed water in. S - heating steam in. C - heating steam out. W - Fresh water (condensate) out.
The multi-stage flash (MSF) method is a widely used technology for desalination, particularly in large-scale seawater desalination plants. It is based on the principle of utilizing the evaporation and condensation process to separate saltwater from freshwater. [28]
Obtaining fresh water from seawater is a theoretically simple system that, in practice, presented many difficulties. While there are numerous effective methods today, early desalination efforts had low yields and often could not produce potable water. [1]
The flow of water can be reversed if a pressure larger than the osmotic pressure is applied on the higher concentration side. In Reverse osmosis desalination systems, seawater pressure is raised above the natural osmotic pressure, forcing pure water through membrane pores to the fresh water side. Reverse osmosis (RO) is the most common ...