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Capz desalination pdf
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Desalination of water

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Today Desalination is a common process that's used in seaside cities and towns worldwide. There are more than 15,000 desalination plants around the world providing fresh water from salt and brackish water alike. Increased water conservation and efficiency remain the most cost effective priorities in areas of the world when there is a large potential to improve the efficiency of water use practices.

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Desalination of water

  1. 1. WHAT IS DESALINATION? Desalination is the process of removing salts and other minerals from the saline water to render it suitable for drinking, irrigation, or industrial uses.
  2. 2. Salinity Type of saline water Salinity value (ppm) Fresh water <1000 Slightly saline water 1000-3000 Moderately saline water 3000-10,000 Highly saline water 10,000-35,000
  3. 3. • Water, water, everywhere, And all the boards did shrink. Water, water everywhere, Nor any drop to drink. - Samuel Taylor Coleridge (1772-1834), "The Rime of the Ancient Mariner" 1798
  4. 4. Why desalination?
  5. 5. Natural desalination Major Stages: 1.Evaporation 2. Condensation 3. Precipitation 4. Collection
  6. 6. Principal methods used for desalination • Distillation(Evaporation) • Electro dialysis • Freezing • Reverse osmosis
  7. 7. Distillation d Salt water is heated in one container to make the water evaporate, leaving the salt behind. The desalinated vapor is then condensed to form water in a separate container. Although long known, it has found limited applications in water supply because of the fuel costs involved in converting salt water to vapor is very high.
  8. 8. Electro dialysis Electrodialysis reversal utilizes a membrane, like that in reverse osmosis, but sends an electric charge through the solution to draw metal ions to the positive plate on one side, and other ions (like salt) to the negative plate on the other. s
  9. 9. Freezing It is based on the principle that water excludes salts when it crystallizes to ice.
  10. 10. Reverse osmosis
  11. 11. Wonthaggi Desalination Plant, Victoria, Australia Aerial view of the IDE desalination plant in Hadera,israel.
  12. 12. • Safety water • Water scarcity can be easily handled. • Availability of Water in Areas of Drought • Alternative Source of Water • Production of a High Yield of Water •Higher Price •Water Quality Problem •Greenhouse Gas Emission •Seawater desalination may affect the sustainable growth of coastal area.
  13. 13. Desalination is process primarily done in developed countries with enough money and resources. If technology continues to produce new methods and better solutions to the issues that exist today, there would be a whole new water resource for more and more countries that are facing drought, competition for water, and overpopulation.

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