Abstract
Recently, environment-friendly public works are demanded. We evaluated an advantage of the utilization of rainwater and treated domestic wastewater in urban area. The rainwater utilization is the use of rainfall on the roofs, walls and collected runoff storm water in the storm water reservoir for flood controls. In the reuse of treated domestic wastewater, wastewater from the raw sewage is not reused. That is “Domestic Water Recycling System”. We evaluated the amount of conserved drinking water and the amount of decreased final effluent polluted matters by the unused water resources utilization. And we estimated the amount of carbon dioxide emission by the construction and operation of the unused water utilization system. Water self-support system (the use of rainfall on the roofs, walls and the domestic water recycling system) are effective in the decrease of the resources consumption and the environmental loads.
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