国水污染问题（Water pollution problem in China）.docVIP

国水污染问题（Water pollution problem in China） To strengthen the rational development of water resources, the implementation of scientific management, to prevent water pollution has become a pressing matter of the moment. At present, Chinas 2/3 rivers have been polluted. According to the 1995 China Bulletin of the environment statistics, Chinas seven major river systems are subject to different degrees of pollution, the main pollution indicators permanganate index, ammonia nitrogen, volatile acid and biological oxygen demand. The Haihe River Basin water pollution is particularly serious, in the basin the size of rivers and reservoirs in Juma River and bridge, Miyun, Huairou, Huangbizhuang, Panjiakou, Zhangze the Yanghe River and Wangkuai reservoir is still good, the rest of the river is polluted, belong to the 4.5 class standard accounted for 41%, 3 kinds of standard accounted for 17%. 1 kinds of standard accounted for 42%. Lake pollution is also worrying, a large freshwater lake total phosphorus and nitrogen pollution in a wide range of serious eutrophication. In the evaluation of 11 lakes in Chaohu, the most serious pollution, exceed the standard of 6 indicators, the main pollutants were total nitrogen, total phosphorus, the average value of 2.73 and exceed the standard 8.22 times, followed by Dianchi, exceed the standard of 8 indicators, total nitrogen, TP average 2.03 and exceed the standard 4.96 times; 2.5 times the annual average mercury exceed the standard. Recently came the news, by the relevant international organizations included in one of the worlds eleven major bird resort Caohai had been polluted, no lead-zinc Caohai around strangely, the development of indigenous zinc smelting. The soil near the discharge of zinc smelting furnace every year tens of thousands of tons of dust into the atmosphere and nearly ten thousand tons of sulfur dioxide gas. Gas smoke and harmful zinc smelting furnace are all blown over serious when you can see the lake, floating on the l