Abstract
In this study, we implemented an isolated decentralized water system with minimized wastewater discharge and maximized water reuse in water-deficient region. Dual quality wastewater reclamation and reuse system with parallel conventional treatment unit and advanced MBR treatment unit was built in which the reclaimed water with normal quality and high quality was produced, respectively. Based on maximum collection of the recollectable discharged water, the minimum-emission scheme characterized by high cycling rate of the limited water resource was formed and consequently all the nonpotable water consumption was covered by the reclaimed water. Environmental lakes integrated with multi-functions of quantity regulation and quality stabilization of the reclaimed water were introduced in the system configuration and stepwise use of the reclaimed water was observed successfully. As a result of the system operation, main pollutants were well removed and the quality of reclaimed water can reach the demands of various non potable reuse purposes. Water bodies on campus prove to be of good quality of surface water. The project accomplished the minimum emission of discharged water and maximum use efficiency of water resource. It was proven to be feasible based on the technical and economic evaluation. This study provided a model case for future urban development in the water-deficient regions.
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