论文部分内容阅读
国家环保总局提供的最新监测结果表明,去年,我国七大流域的干流有近一半的河段受到了不同程度的污染。国家环保局1988年公布实施的《地面水环境质量标准》把江、河、湖泊、水库等具有使用功能的地面水分为这样几大类,分别是一类、二类、三类、四类、五类和劣五类。一般来说,优于三类的水才可以用做饮用水源;四类只能
The latest monitoring results provided by the State Environmental Protection Administration show that in the past year nearly half of the major river basins in the seven major river basins in China were polluted to varying degrees. The State Environmental Protection Administration released in 1988, “Groundwater Environmental Quality Standards” to the use of water features such as rivers, lakes, reservoirs and other surface water into several categories, namely, a class, class II, class III, class IV, Five categories and inferior five categories. In general, better than three types of water can be used as a source of drinking water; only four categories