溧水水库型饮用水水源地水环境现状及污染源分析

为研究溧水方便水库的污染情况与环境现状,分析了COD、TN、TP、叶绿素量等指标,发现以农田径流为主的面源污染是最主要的水源地污染源,水源地主要超标污染物为TP及TN,总体属于Ⅳ类水。通过对大量数据进行指数分析发现:方便水库平水期水质最优,基本处于贫-中营养等级;丰水期的水质最差,基本处于中度富营养化状态,水体富营养化严重;枯水期水质良好,存在轻度富营养化趋势。方便水库的底泥重金属污染等级为低风险等级,整个方便水库的底泥属于营养盐污染底泥,有机污染严重,亟需进行适当的清淤处理。本研究对预防和控制水体污染及富营养化有一定的参考作用。

Analysis of water environment condition and pollution sources for the Lishui drinking-water reservoir

To analyze the pollution and environment condition of Lishui Fangbian Reservoir, the indexes, including COD, TN, TP and the content of chlorophyll, were investigated in this research. It was found that non-point source pollution with the agricultural runoff was the main pollution source. The water quality in the reservoir belonged to grade IV, and the main pollutants in the water source are TP and TN. Through an exponential analysis of a large number of data we found that the water quality is at the best condition with the status of oligotrophy to low-medium trophy during normal water season, while it was at the worst condition with oligotrophic to medium trophic level during high water season. At the low water season, the water exhibited a mild eutrophication trend. With respect to the sediment, the heavy metal pollution was at the low level of risk, the sediment of the whole Fangbian reservoir belongs to the nutrient salt polluted sediment, and it was seriously polluted by organics that might need further dredging. This study would provide a guidance for the prevention and controlling of eutrophication in the water reservoir.