含氮污染物在地下水中迁移转换模型的参数分析

Analysis of Parameters on Transporting Model of Nitrogenous Contaminants in Groundwater

由于氮元素对地表水的污染往往造成水体的富营养化,而氮元素进入地下水往往会使水质不符合卫生饮用标准,从而给人们健康带来不利影响。根据氮元素污染物的迁移特点和影响因素,提出了含氮污染物在地下水环境中的一维非平衡态变系数迁移转化的控制方程,并用有限差分方法对其进行耦合。借助于数值算例讨论含水率(θ)、植物吸收速率和微生物降解系数(1λ)对污染物运移的显著影响,揭示了植物吸收和微生物降解对治理地下水污染的重要性。

The pollution of nitrogen in the surface water usually causes over-nutrition, and when pollution filters in groundwater, the quality of water cannot reach the healthy standard of drinking. Therefore, it brings bad effects for people＇s health. The non-equilibrium controlling model of one dimension and varying coefficients is presented for the transportation and migration of nitrogenous contaminants in groundwater, and the coupling FDM formulation is developed. The effects of water containing rate（0）and plant absorbing rate and microbe decomposing rate（ill）are studied on the model and indicate the importance of plant absorbing rate and microbe decomposing rate on the pollution of groundwater.