污水灌溉对地下水污染的机理研究

以焦作市南部新河沿岸灌溉区为研究对象,分别用污水和大气降水进行了土柱淋滤模拟实验,分析了氯离子、总硬度及TDS在土壤中的迁移转化机理.实验结果表明,渗出液中的污染物浓度最初较小,随后出现最大值,最后开始下降.表明当地浅层地下水中氯离子、总硬度及TDS污染与污水灌溉有关.

Study on mechanism of groundwater pollution due to applying sewage water for irrigation condition

The present paper aims to discusses the pollution caused by using polluted water for irrigation along the Xin River reach in the south of Jiaozuo City. Stimulated experiments of the soil column leach have been done with the sewage water and clean water. This paper has also analyzed the flowing and changing characteristics of the clean water, its total hardness and TDS. The result of the experiment shows that the pollutant concentration from the leach in effluent is small at the beginning, later it increases to the maximum value and then gradually begins to fall. And at the last stage, the total hardness of the leach water proves 835.38 mg/L, In contrast, concentration of the clean water is 419.115 mg/L, whose concentration is almost equal to the leach water. With the distilled water leaching, the concentration of the total hardness and Cl- decrease constantly. According to the actual agricultural irrigating situation in the local area, the pollutant' s leaching speed is larger as a result of sewage irrigation, and, therefore, the leaching has turned to be considerable soluble salts in the aeration zone. Thus, the present study proves that the pollution of CL, total hardness and TDS in the pore shallow groundwater are all related with the sewage irrigation.