upgrading water, wastewater treatment & desalination plants based on reuse demand in water scarcity situation

Water savings can be achieved in different industries through a combination of changing behavior, modifying water saving equipment to reduce overall water consumption and increase internal reuse. treating wastewater for reuse has become an accepted and reliable technical solution to save water. in fact, water recycling and waste water reuse have proven to be effective in creating reliable water supply. iran is located in the dry belt of the earth, where nearly 70% of its area is located in arid and semi-arid regions. at the present time, iran is experiencing a serious water crisis and tries to reuse waste water sources such as urban, domestic, industrial, agricultural,….. different physical steps such as settling basin, oil skimmer, clarifiers, self-cleaning filters, activated carbon filters, filter press, flocculates, thickeners and membrane technologies are suggested according to the quality of waste water. de-emulsifier, poly electrolytes, disinfections, corrosion inhibitors, anticipant, advanced oxidation process are the common chemical treatment. the objective of this paper is to present possibilities of waste water reuse and water usage reduction and consequences of this operation in industrial regions. higher treatment quality could increase the number of water cycle count and save water.