عنوان مقاله [English]
In today world water and water resources are considered as one of the most important properties. The main challenges for societies are to prepare food, water and energy. Among these it is somehow easier to provide food, because there are many ways to prepare it, also energy because of finding new resources, and it is only water that can make troubles for societies if there is no resource left. So planning for economizing the use of it and protection of available resources are of primary priorities. On the other hand occurrence of several droughts and increasing population growth, make the need for healthful drinking water. The water purification, better use of it in industry, water need in agricultural, the technological advances to use industrial, such as analytical methods in water purification and reducing the costs is inevitable. Some examples are chromatographic columns, resins, ion exchangers for softening, and reducing the hardness of water, and other processes such as chlorination, fluoridation, filtering and precipitation via advanced methods by using effective disinfection, advanced industrial methods and use of microprocessors to control the purification. In this connection purification processes in advanced countries are investigated such as United States. The advantages and disadvantages of mentioned methods are reported from different aspects. The result of such studies can provide us to use the new experiences in the world to use water Treatment technologies in Iran in order to prepare healthful drinking water and at the same time to reduce waste of time and expenses.