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jim5362(金币+20,VIP+0):非常感谢 12-18 16:47
Nanning City is the capital of Kwangsi Zhuang Autonomous Region, located in the stream segment of Yong river belonging to the
middle and lower reaches of Yu river which is the largest tributary of Xi river's water system in the river basin of Pearl river and divided into two regions of the southern one of Yong river and the northern by Yong river flowing through Nanning city. At the end of 2008, the number of population in Main City is 2.48 millions, in which the number of floating population is 0.58 millions. In recent years, the Nanning city's economic development is rapidly expanded, with the increasingly rapid process of urbanization, the rapid economic growth and the improvement of people's living standard, the environmental problem is gradually becoming one of the main factors severely imposing restricts on the development of social economy. the pollution situation of some inland rivers in Nanning city is still severe, a part of which conform to V type in GB3838-2002"the quality standard of Surface Water Environment", even being inferior to Ⅴ type standard, And because of the popularization rate of sewage pipe's network and the shortage of sewage disposal capacity in Nanning City, the popularization rate of sewage pipe's network is 52.14% in 2008,with sewage disposal capacity of 44 million m3 / d and the disposal capacity accounting for 59.9% in the total amount of sewage ,and the untreated sewage (25.77 million m3 / d) is directly discharged into the urban water system, causing the water pollution and bring about great damages on the ecological environment.
In recent years, the water quality of Yong river's local reaches suffers from severe pollution, mainly caused by the excessive discharge of a great amount of industrial sewage from manufacturing enterprises engaging in sugaring, paper making, starch producing and alcohol making ,and most of the urban untreated sewage is directly discharged into the river. Constructions of wastewater treatment facilities seriously lag behind ,focusing on developing and paying a little attention to protection are main causes of the severe pollution of Yong river and its tributaries.
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