Groundwater Environmental Impact Assessment Of Yongnian Industrial Park Based On Numerical Simulation

With the rapid development of economy and society,the demand for water resources is also increasing,groundwater is widely used,followed by increasingly serious groundwater pollution,especially the discharge and leakage of industrial wastewater.If we do not take timely and effective prevention and control measures,it will cause serious water pollution.Therefore,it is of great significance to predict the possible groundwater pollution in the industrial park and put forward corresponding prevention and control measures.In this paper,the industrial park of Yongnian County in Hebei Province is taken as the research area.Based on the hydrogeological conditions and the investigation results of pollution sources,the numerical model of groundwater flow and solute transport model are established.According to the current situation of the park,two scenarios are set to simulate and predict the groundwater pollution under different scenarios,and based on the prediction results,the prevention and control measures for groundwater pollution are proposed.Through the above research,the following conclusions are drawn:(1)under the accident,both ammonia nitrogen and COD cause pollution to groundwater.(2)In scenario a,the maximum exceeding range of ammonia nitrogen and COD is 30000 m~2and 20000 m~2 respectively,and the maximum migration distance is about 1 km after6000 days of accident.In scenario B,the maximum exceeding range of ammonia nitrogen and COD is 10000 m~2 and 16000 M~2 respectively,and the maximum migration distance is about 1 km after 7000 days of accident.(3)After the two kinds of accidents,the impact range of ammonia nitrogen and COD is not beyond the park,and the pollution risk of the water environment outside the park is small,but the risk of villages and aquifers in the park is large.(4)Once the groundwater is polluted,it will take a long time to recover.Therefore,prevention and control measures should be taken in advance to prevent and control pollution from the source.Once pollution occurs,control and governance should be carried out immediately to minimize the spread of pollution.