Groundwater Pollution Forecast And Risk Assessment Based On Process Simulation

Groundwater quality safety has a direct impact on human health and development.As a forward-looking part of the groundwater assessment,groundwater pollution prediction is important for the prevention and control of groundwater pollution.And groundwater pollution risk assessment,as the basic work of groundwater protection,has become an important means of groundwater supervision.In January 2016,?Environmental Impact Assessment Technical Guidelines-Groundwater Environment?(HJ 610-2016)was issued,which is asking for higher demands on the evaluation of groundwater environmental impact.The Guidelines clearly required that secondary evaluation should use analytical method and numerical method.At present,the numerical method has a lot of mature software,but it is very expensive and the prevalence of simulation cycle is long.In order to solve this problem,this paper realizes the visualization of the analytical model of groundwater solute transport and provides technical support for the prediction of groundwater pollution,which is of great value to the implementation of the Guidance.In this paper,we first use the analytical solution of groundwater solute transport analysis under different conditions given by the guide to realize the visualization of solute transport analysis model,then forecast the pollution level and pollution range of characteristic pollutants.Secondly,this paper constructs a risk assessment method to evaluate the risk of groundwater pollution with a chemical plant as the case.The aim of this paper is to provide a simple and effective method for the prediction and risk assessment of groundwater pollution for similar construction projects.The main achievements of the thesis are as follows:(1)Establish the visual operation interface of the solute transport analysis modelBased on the analytical solution given by the Guidance,the visualization of the analytical solution is realized by Excel platform and VB programming,which provides a new method for the groundwater environmental assessment.(2)Groundwater pollution predictionTaking a chemical plant in Huai'an as an example,apply the model established earlier,the results are as follows:100 days after the accident,the maximum migration distance of permanganate index is 11.6m,the maximum migration distance of nickel is 10.8m,which is 8.8m and 8.0m respectively.The diffusion rate of pollutants is very fast.Therefore,Focusing on good anti-seepage treatment,do regular monitoring is very important.In the event of a leak,timely treatment of emergency measures should be made.Strengthen equipment maintenance and management in project run time,to prevent drip and other unorganized emissions,while regulating engineering seepage zoning.(3)Risk assessment of groundwater pollutionUse the risk evaluation method constructed in this paper which is based on process simulation to evaluate the risk of the groundwater pollution,the results are as follows:W1 belongs to the low pollution risk level,W2 belongs to the higher pollution risk level,and has a trend of closing to the high pollution risk,and W3 belongs to the middle pollution risk level.Therefore,the factory in the production process need to carry out regular inspection of sewage pipes and sewage treatment equipment,in order to make the pollutant leakage of groundwater risk accidents to a minimum,the risk contingency plans and emergency management should be developed.In the event of major pollution incidents,take immediate emergency measures,to prevent further diffusion to the downstream.