基于Visual MODFLOW的某药厂地下水污染模拟研究

Simulation study of groundwater pollution in a pharmaceutical factory based on Visual MODFLOW

以某药厂作为研究区,应用Visual MODFLOW建立了地下水水流模型和溶质运移模型,模拟了污水池底部防渗破损非正常工况下4种特征污染物运移情况,数值模拟预测污染物的影响范围、超标范围和最大运移距离。由预测结果可知:污染物主要沿水流方向运移,对水环境的影响随时间逐渐增大;在重力的作用下从地表逐步渗入深层,造成局部的地下水环境污染,在计算时间段内,二氯甲烷、CODMn、氨氮和酚的渗漏会对厂区地下水水质造成一定的影响,导致局部地区地下水中的污染物超标,但是20 a的污染物均未扩散至厂界范围以外。

From a pharmaceutical company as the study area, the application of Visual MODFLOW to establish the model of the groundwater flow and solute transport model, simulation of the sewage tank bottom seepage characteristics of 4 kinds of non damaged pollutant migration under normal condition, numerical simulation and prediction of pollutants exceed the standard range of influence range and the migration distance. The predicted results show that pollutants mainly migrate along the direction of water flow, and the influence on water environment increases with time. In the calculation of time, leakage of dichloromethane, CODMn, ammonia and phenol will cause a certain impact on the groundwater quality in the factory, resulting in groundwater pollutants exceed the standard local area, but 20 years of pollutants were not spread to outside the factory.