Study On Migration Regular Pattern Of Contaminants In Groundwater From Tangshan ZhaoGezhuang Landfill Leachate

With the acceleration of urbanization，the garbage output growing larger, Leachateproduction is gradually increasing. Due to high concentrations leachate and complexingredient, will greatly harm the environment. Survey,TangShan Zhaogezhuang dumphas already polluted the surrounding water, soil, atmosphere, etc. So we should make clearthe way of the eachate how to pollut the groundwater,and the pollutants in the groundwaterpollution mechanism,for management of leachate can put forward feasible measures.This paper through analyzing the zhaogezhuang landfill pollution situation,preliminary study using numerical garbage pollution in ground water pollution mechanism,to determine the extent of pollution and garbage dump polluted areas. Using the dispersiontheory, analyses of groundwater pollution ways of pollutants, once the pollutants enter thegroundwater,pollutants will rapidly migrate to the downstream, when the hydraulicgradients is big and the permeability is well. When the hydraulic gradient is small ane thepermeability is large，downstream migration of contaminants at the same time, spread toboth sides of a large range. Through the establishment of numerical model, preliminarystudy on the mechanism of groundwater contamination, predicted trend of pollution inlandfill. The diffusive pollutants in aquifer is the numerical simulation is using visualModflow3d groundwater flow and solute transport simulation professional software,groundwater flow direction along the discovery of groundwater has certain garbagepollutants influence, the closer from the dump, the higher the concentration of pollutant; thehigher the initial concentration of pollutants, the more severe the degree of pollution ofgroundwater. Pollutant emissions and concentrations of pollutants change the focus of the migration of contaminated. When the pollutant emissions and concentrations remainunchanged or increase,groundwater beneath the landfill is the most polluted, Whenpollutant emissions and concentration gradually become the hours,groundwater pollutionof groundwater gravity would move along to the downstream. Predicted by the model canbe drawn, only the shallow groundwater zhaogezhuang dump by leaching solutionpollution, and pollution are limited, as time goes on, leaching solution infiltrationrecharge and pollutant concentrations increasing the speed will ease, look from theprediction results5years after the landfill operation on the groundwater pollution has beenbasically stable.Based on the analysis of the experiment, combined with natural geography researcharea with hydrogeological characteristics,using the software simulation leachatecontamination of shallow groundwater migration process,simulated under differentscenarios of pollution transport conditions. And put forward feasible measures to preventpollution. For the next zhaogezhuang dump management，engineering design,soil andgroundwater repair management to provide the basis. Therefore of great significance.