污染河道对沿岸地下水环境影响规律研究

Study on the influence of polluted river on its offshore groundwater environment

以江苏奎河为例 ,观测研究奎河污染物CODCr、NH+4 N、NO-3 N、Cl-入渗进入地下水中发生物理、化学及生物变化的时空分布规律 ,分析河道沿岸土壤对污染物的去除能力。结果表明 :河床的土壤对污染物CODCr具有很高的去除率 ,对NH+4 N亦有较高的去除率。河道中的NO-3 N在入渗过程中虽有一定的去除率 ,但由于NH+4 N、NO-2 N等污染因子转化成NO-3 N ,因此该浓度不一定会明显降低。Cl-是保守性污染因子 ,入渗过程中虽有一定的去除率 ,但仍对沿岸地下水环境产生影响。因此 ,当污染河道中污染因子是保守性物质时 ,必须考虑对沿岸地下水源地的影响。

It has great academic and practical significance to study the influence of polluted river on its offshore groundwater environment where surface water is seriously polluted Based on the field observation experiments in Kui River in Jiangsu province, the time and spatial distribution rule on physical, chemical and biological change of pollutants such as COD Cr ,NH + 4 N,NO - 3 N,Cl - infiltrating into groundwater is discussed And the ability of river offshore soil and groundwater to remove pollutants is analyzed The field data shows that the efficiency of river sediment and its offshore soil to remove COD Cr is high, to remove NH + 4 N and NO - 3 N is higher, to decrease the concentration is low due to the transform of NH + 4 N and NO - 2 N into NO - 3 N, and to remove Cl - is very low due to its conservative character. As a result, the influence of conservative pollutant on river offshore groundwater must be considered