Groundwater Pollution Prevention And Control Management Model For Yunnan Anning Yuntianhua Isooctane Plant

Over the years,as the environment has deteriorated,the demand for groundwater has increased,but problems such as uneven groundwater exploitation and other human activities have caused pollution of surface waters and pollution of groundwater.Industrial pollution sources have a wide range of pollution,large emissions,and high processing difficulty.The research area of this paper is located in Caopu Town,Anning,and produces industrial isooctane and other products from unsaturated LPG,saturated LPG and hydrogen supplied by Yunnan Refinery.This paper takes the karst water anti-fouling problem under the potential pollution source of chemical plant as the research goal,and combines the field hydrogeological survey,drilling and test to calculate and analyze.The results show that the anti-fouling performance of the Quaternary loose layer in this area is weak,the karst development in the west is bare,and the east is shallow.The karst exposed area directly receives atmospheric rainfall recharge.The pollution pathway is that the pollutants enter the loose layer,affect the pore water in the loose layer,and then enter the karst development zone such as limestone and dolomite through pores,fissures and other channels,further affecting the karst water.This section has set up emergency pumping wells by analyzing its pollution pathways and runoff directions.Once a groundwater pollution accident occurs in the plant area,an effective drop funnel is formed by controlling the hydraulic gradient and adopting the “extraction treatment method”.Under the constraints of not causing environmental problems,the embedded model is used to couple the mathematical model and the numerical model to establish a pollution prevention and control management model for the groundwater system in the study area,and the optimal solution is obtained.It not only provides a basis for groundwater pollution prevention management in the plant,but also provides reference for groundwater pollution problems similar to chemical plants.According to the way of pollutant leakage,the leakage mode and the leakage amount are divided into two conditions: point source pollution and non-point source pollution,and they are simulated separately.Scenario 1 is that when the pollutants are not accumulated and the area of the pollution plume is small,when it is monitored by JC06,the pumping of scheme 1 and scheme 2 is used respectively to simulate the change of flow field and the treatment of pollutants.Comparing the pollution plume area and the concentration of pollutants in the two schemes,it can be known that both schemes 1 and 2 can achieve the effect of preventing and controlling pollution.In the scheme 1,the pollutant concentration of the monitoring well drops to 0.05 mg/L after 300 days of pumping.Option 2 achieves the same effect after 220 days of pumping,and then considers option 2 in scenario 1 to satisfy the optimal solution of the management model.Scenario 2 is when the pollutants are accumulated more and the area of pollution plume is larger,and it is monitored by JC05 and JC06.After pumping water in schemes 3 and 4,and increasing the amount of pumping water in emergency wells in scheme 4,the total amount of pollutants is significantly reduced,and the treatment efficiency is more obvious.However,the pumping of large flow reduces the downstream spring flow,and after pumping,it exceeds the allowable reduction of the deep value in the area,which may cause geological disasters such as land subsidence and karst collapse,and does not satisfy the constraint conditions.Therefore,the scheme is not applicable.Therefore,in scenario 2,scenario 3 satisfies the optimal solution of the management model,and the processing effect is the best.The three-point source pollution of the scenario is small,mainly in the scope of the plant,and has little impact on the downstream.Therefore,Scheme 5 is adopted as the best disposal plan.Finally,the scenario 1 scenario 2 and scenario 2 scenario 3,and the scenario 2 scenario 3 scenario 5 are selected as the treatment plan for groundwater pollution in the study area.