长期污灌条件下土壤污染环境影响评价方法

Environmental Impact Assessment Method of Soil Pollution under Long-term Sewage Irrigation

在长期污灌条件下,土壤对污染物的降解能力会受到一定影响,采用单一的基础参数计算对应的土壤污染环境影响,准确性将大大降低,为此,本文研究了长期污灌条件下土壤污染环境影响评价方法。本文结合污染物在土壤中的作用机理,采用一维垂直方向运移方程对土壤中污染物受到的对流、弥散、吸附以及植被的吸收和覆盖作用进行综合考量,构建了土壤污染模型,根据不同浓度及不同性质污染物的作用强度,计算任意持续污灌时间下土壤的指标参数,并以此为基础,通过设置污灌允许波动阈值范围,计算出对应的土壤污染环境影响。当实际的污灌条件不在阈值范围内时,可以更新参数,再利用该模型重新计算出对应的土壤污染环境影响。测试结果表明,设计方法在纵向深度层次和横向广域层次均可实现对土壤污染环境影响的准确评价。

Under the condition of long-term sewage irrigation,the degradation ability of soil to pollutants will be affected to a certain extent,and the accuracy of calculating the environmental impact of soil pollution using a single basic parameter will be greatly reduced.Therefore,the method of environmental impact assessment of soil pollution under long-term sewage irrigation is proposed.Combined mechanism of pollutants in the soil using one dimensional equation of vertical migration of pollutants in soil by convection,dispersion,adsorption and the function of the vegetation to absorb and cover a comprehensive consideration,and constructs the model of soil pollution,according to the different concentrations of pollutants and the intensity of the role of the different nature of the pollutants,calculate the index of the soil under arbitrary wastewater irrigation duration parameters,On this basis,by setting the allowable fluctuation threshold range of sewage irrigation,the corresponding environmental impact of soil pollution can be calculated.When the actual sewage irrigation conditions are no longer within the threshold range,the parameters can be updated and the corresponding environmental impact of soil pollution can be calculated again by using the model.The test results show that the design method can accurately evaluate the impact of soil pollution environment in both vertical depth level and horizontal wide area level.