Desalination Essay

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Tampa Bay Water is a seawater desalination plant located in Tampa, Florida. Their method of desalination of ocean water or brackish groundwater is another method to obtaining water from fresh surfaces or groundwater sources. This could be used to replace the need for a water supply dam. There are several different technologies that exist to remove salt and other impurities from ocean water. The two most commonly used methods are thermal distillation and desalination. Thermal distillation copies the natural water cycle by using heat to create a vapor that is converted into freshwater. Desalination is a process that removes some amount of salt and other minerals from saline water. The traditional process used is vacuum distillation, which boils water at less than atmospheric pressure making the water sit at a much lower temperature than normal. This is due to the fact that the boiling of liquid occurs when the vapor pressure equals the outside pressure and vapor pressure increases with temperature. Due to the reduced temperature, low-temperature "waste" heat from electrical power generation or industrial processes can be used. The processes use membranes to desalinate, by applying standard reverse osmosis technology. These membrane processes use semi-permeable membranes and pressure to separate salts from water.
A side method within desalination is cogeneration. Cogeneration is a process known to use excess heat from electricity generation for another task. In this case desalination plants use this for the production of potable water from seawater or brackish groundwater in an integrated, or "dual-purpose", facility where a power plant provides the energy for desalination. The facility's energy production may be set aside for t...

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...mize the dispersal of the concentrated seawater. This allowed for the brine to be a lesser threat to ocean life especially at the bottom.
Desalination plants overall could be a huge benefit to society for its high quality of water and intuitive water treatment techniques, however the big environmental impacts and high costs to produce water at a desalination plant makes it unfavorable to most communities especially the poorer communities. Although costs for the production and upkeep for a desalination plant has been going down while the technology of it rises, the only true benefit for having a desalination plant would only come into affect when it is near a body of ocean, such as Tampa Bay Water. All in all desalination plants could soon be the face of future water treatment plants and water sources, but for the present time it is still only a niche water source.

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