The Migration Prediction Researc Of Heavy Metalion In Groundwater

The tailings reservoir as an important environmental protection facilities in mine enterprises, is very important to strengthen the natural purification of water, prevention and treatment of tailings loss, and regulated the flow. During use of the tailings, pollutant will leak to the underground and spread to the surrounding environment over time, thus, it will destroy the ecological environment and pollute the groundwater, and brings a certain degree of impact on human health. To effective of protection groundwater resources, guarantees local residents drinking water, industrial water and the agricultural irrigation of security, in this paper, I choose the tailings reservoir of "Yanbian county DeTian mining limited liability company3500000tons of vanadium titanium magnetite mining project" for cases, the numerical simulation for the under groundwater in the area of tailings reservoir is calculated by ecomsed model that is based on the observed data for geological, and hydrological geological. Through the identification and verification of the model and parameters and concluded that this model is able to reflect more realistic movement characteristic of the study on regional groundwater systems. On this basis, a solute transport model with heavy metal ions Ti as the simulation factor was established, the model use MT3DMS to solve, and then predict the pollution of groundwater in the study area by Ti. Finally, combined with the software to analyze the uncertainty of permeability coefficient in groundwater numerical simulation. The main conclusions are as follows:1. Based on the geological, hydro geological conditions, groundwater occurrence condition, the groundwater type in the study area are determined, mainly consists of Quaternary loose rock pore prelatic water and metamorphic rocks, magmata class of bedrock fissure water, the bedrock fissure water. The aquifer is divided into permeable layer, aquifer and aquifuge three types.2. Through the analysis of the hydro geological conditions in the study area, generalized simulated zone boundary. Through field pumping test and injection test data, given the initial value of hydro geological parameters, and the parameters into the model, through continuous adjustable fitting, finally the hydro geological parameters in comparison with the actual determination.3. The results of pollutant migration simulation: In the dual influence of groundwater diffusion and groundwater runoff, the pollutants Ti in tailings reservoir is migrated to the South mainly. The scope of pollutant dispersion is similar in shape with tailings reservoir, and increased expansion with time gradually to the two axes (north-south direction as the longitudinal axis, the east-west direction as the horizontal), in the runoff of groundwater, vertical migration range was larger than the lateral, groundwater flow in the downstream is bigger than upstream pollution range, due to the lack of under groundwater in the east, there is no pollutant diffusion in the east side direction of the reservoir.4. Parameter uncertainty analysis:Permeability coefficient k factor transformation method for groundwater numerical models of uncertainty analysis and concluded that when the permeability coefficient k range when changes in-10%~0, corresponds to the fitting error minimum (less than1per thousand), on model of uncertainty is also smaller.