南水北调中线总干渠水质变化趋势及污染源分析

为了解和掌握南水北调中线总干渠水质状况,依据总干渠26个常规水质断面监测数据,分析了总干渠沿程水质变化趋势。结果表明,主要污染指标(CODMn、氨氮、总氮和总磷)呈现出沿程增加趋势。根据影响总干渠水质的潜在影响因素,分析了7类污染源(直接水污染、大气粉尘沉降、桥面雨水污染、底泥污染、周边垃圾场淋溶液污染、雨洪污染、受污染地下水)及其可能对干渠水质产生的影响程度,并针对不同污染源提出了防控对策,供管理部门决策参考。

Analysis of water quality variation and potential pollution sources in main channel of Middle Route Project of South to North Water Diversion

To understand the water quality in the main channel of Middle Route Project of South to North Water Diversion, the water quality variation trends were studied with the monitored data from 26 regular monitoring sites. The results show that the concentration of the main pollutants (CODMn, NH3-N, TN, TP) increased along the canal. Through analysis, 7 potential pollution sources (rain water direct pollution, air dry dust precipitation, bridge surface rainwater pollution, bottom mud pollution, leaching pollution of garbage field in surrounding area, rain flood pollution, polluted underground water) were determined and the impacts on the water quality in the main channel were analyzed. According the analysis results of pollution sources, the prevention and control measures in the light of different pollution sources are put forward to provide the reference for the related departments.