About 4 billion people could suffer water stress by 2050 due to climate change and population growth. As mitigation strategy against the water stress especially in urban areas, there are two approaches for artificial water production, which are seawater desalination and wastewater reclamation. Previous studies stated that the wastewater reclamation is environment-friendly and its cost and energy consumption are lower than the seawater desalination. Modern wastewater reclamation, which has started since the 1960s, have been encouraged to introduce by many countries. Reclaimed water, which is produced from the wastewater reclamation, has been indispensable water supply and universally used for several purposes such as irrigation, industrial water, landscape water, recharge of groundwater and drinking water. However, the contribution of the reclaimed water supply to the mitigation of the water stress in the future has not been well investigated yet. In this study, we aim to clarify the quantity of available water, assuming that the wastewater reclamation system is introduced in areas where the system can be applied from the physical and economic point of view. The physical feasibility was determined by using population and sewage drainage volume data. The economic feasibility was determined by taking cost of reclaimed water and water tariff into account. This study would provide us the perception of utility of the water reclamation and materials for discussion on the water stress mitigation.
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