论文部分内容阅读
近数十年来,由于工农业的发展,因“三废”处理不当而导致水源的严重污染已成为环境保护的重大问题。如美国河流总长的28.6％受到严重污染;饮用取自污染水源的人数约占总人口三分之一。日本47系河流,23条受到严重污染。我国水源污染情况也是严重的,污染物有酚、氰、汞、铬,砷、苯、硝酸盐等。如某市近数年来两个自来水厂的水源中酚、汞、砷都超过地面水最高允许浓度。由于水源污染而引起传染病的流行及急、慢性中毒事例在国内外都是屡见不鲜的。据报告全世界每年因饮
In recent decades, due to the development of industry and agriculture, the serious pollution of water sources due to improper handling of “three wastes” has become a major issue for environmental protection. For example, 28.6% of the total riverine in the United States is seriously polluted; drinking water from polluted water sources accounts for about one third of the total population. 47 series of Japanese rivers, 23 were seriously polluted. China’s water pollution is also serious, pollutants are phenol, cyanide, mercury, chromium, arsenic, benzene, nitrate and so on. For instance, in recent years, the water, phenol, mercury and arsenic in two waterworks in a certain city have exceeded the maximum allowable concentration of surface water. The prevalence of infectious diseases and acute and chronic poisoning cases caused by water pollution are common at home and abroad. It is reported that the world drinks every year