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《Arid Zone Research》 2003-03
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Analysis on the Influence of the Reuse of Urban Wastewater on Water Resources and Its Economic Returns in Arid Areas

Wei Yuanming 1, Zhu Lixia 2, Qiao Yanjun 3, Zhang Jingping 1 (1 Lanzhou Institute of Arid Meteorology, State Meteorological Administration, Lanzhou 730020, China; 2 Gansu Provincial Institute of Environment Protection, Lanzhou 730000, China; 3 Lanzhou Meteorological Bureau, Lanzhou 730020, China)  
The Hexi Corridor in Gansu Province is an arid area; it is one of the five main production bases of marketable grain and vegetables in China and has a vast prospect in developing industrial and agricultural production. However, the water quality of both urban surface water and groundwater is deteriorated by draining the untreated urban wastewater. In Zhangye City, for example, the annual precipitation is only 160 mm, the water consumption for agricultural irrigation and industrial production is mainly based on groundwater and partial surface water from Shandan River and Heihe River. In this paper, a case study on the influence of reuse of the residual wastewater from Zhangye Wastewater Treatment Plant on the groundwater and surface water is carried out. The results show that, under the condition that the pollutants including COD cr , BOD 5, SS, NH 3-N and TP po4 in the wastewater are reduced in big quantities, the groundwater will not be polluted if the residual wastewater is reused, but the surface water will be polluted to some extent. If the residual wastewater, 1.849×10 7 m 3 in volume annually, is channeled to Hongshawo region to irrigate farmlands or forests without draining into Shandan River, the stream water quality of Shandan River will be able to be improved and an irrigated area of 5.33×10 4 hm 2 enlarged. If the residual wastewater is completely reused, the callback period of the investment will be shortened for 4.4 years than to partially reuse it, so the reuse of the residual wastewater has great economic returns and environmental benefits.
【Fund】: 国家自然科学基金项目 ( 4 0 2 0 5 0 14 )
【CateGory Index】: X820.3
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