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Seawater desalination is the use of seawater desalination production of fresh water. Is to achieve the use of water resources, open source incremental technology, can increase the total amount of fresh water, and from time and space and climate effects, water quality is good, the price becomes more reasonable, you can protect the coastal residents drinking water and industrial boilers and other stable water supply. The process of obtaining fresh water from seawater means seawater desalination. The seawater desalination method is seawater freezing method, electrodialysis method, distillation method and reverse osmosis method. The reverse osmosis method of reverse osmosis membrane is used to quickly occupy the market with the advantages of simple equipment, easy maintenance and modularity of equipment. Distillation has become a widely used method.

Reverse osmosis method

Usually also known as ultrafiltration, is 1953 began to use a membrane desalination method. The method separates seawater from fresh water by using a semipermeable membrane that allows only the solvent to pass through and does not allow solute to pass through. Under normal circumstances, fresh water through the semipermeable membrane spread to the side of the sea, so that the water side of the liquid surface gradually increased until a certain height to stop, this process is infiltration. At this point, the water side of the water column static pressure is called osmotic pressure. If a greater pressure is applied to the seawater side than the seawater osmotic pressure, the pure water in the seawater will reverse osmosis into fresh water. Reverse osmosis **** advantage is energy saving. Its energy consumption is only 1/2 of the electrodialysis, distillation of 1/40. Therefore, from 1974 onwards, the United States and Japan and other developed countries have to focus on the development of reverse osmosis.

Reverse osmosis desalination technology developed rapidly, the project cost and operating costs continue to decline, the main development trend to reduce the operating pressure of reverse osmosis membrane, improve the recovery of reverse osmosis system, cheap and efficient pretreatment technology to enhance the system anti-pollution ability.

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