Effect Of Vertical Circulation Well On Groundwater Flow Field And Ammonia Nitrogen Removal Impact

In view of the pollution of the groundwater environment caused by landfills,it has become a top priority to propose a reasonable method of remediation of groundwater pollution.At present,there are many ways to repair aquifers,and the in-situ repair technology of groundwater vertical circulation well is considered to be one of the most promising methods.The vertical circulation well device is widely used in aquifer restoration,hydrogeological parameter estimation,and building foundation pit precipitation.The predecessors studied the hydrodynamic influence range and removal of aquifer pollutants in the lateral unconfined confined aquifer Efficiency,but not for laterally bounded conditions,so this article is of great significance to study the influence of vertical circulation wells on groundwater flow field and ammonia nitrogen removal effect for laterally bounded conditions.In this paper,indoor experiments and numerical simulations are carried out on laterally bounded aquifers to analyze the hydrodynamic field law of vertical circulation wells,based on the inversion of dispersion parameter,parameter sensitivity analysis and pollutant removal based on indoor solute transport experiment The effect analysis,as well as the demonstration and analysis of the influence of the lateral boundary on the hydrodynamic field of the vertical circulation well under the indoor experimental scale.The main research results obtained in this article are as follows:(1)The existing mathematical model and analytical solution of the hydrodynamic field of the vertical circulation well are analyzed,and the vertical circulation well device is designed.(2)Carrying out the hydrodynamic field experiment of the vertical circulation well in the indoor experimental scale,and then establishing a numerical model of the indoor experimental hydrodynamic field,using analytical solutions to verify the accuracy of the numerical model,and comparing with the indoor hydrodynamic field experiment results The accuracy of the experimental results of the indoor hydrodynamic field is based on the change of the head height,and the head contour map is drawn.(3)Draw the vector diagram of groundwater flow direction,calculate the groundwater flow velocity in the flow field,and get the circulation law of the hydrodynamic field.(4)Based on the hydrodynamic field conditions of the indoor vertical circulation well,the indoor vertical circulation well solute transport experiment was carried out,and the solute transport law was obtained,and the solute transport distance was plotted at different times.(5)By establishing a numerical model of solute transport and inversion of the dispersion parameter,the same solute transport law as the indoor solute transport experiment is obtained,and different dispersions are selected for parameter sensitivity analysis,and the dispersion is compared to the concentration penetration.The influence of the penetration curve.(6)Aiming at the laterally bounded conditions,multiple sets of different pumping flow rates and pumping section spacing conditions were simulated,and the head error distribution diagram,forward tracking streamline diagram and groundwater flow ratio diagram were drawn,and demonstrated through comparative analysis The influence of the lateral boundary on the head,streamline shape and flow ratio is presented;and the dimensionless parameters are proposed to further quantitatively analyze the influence of the lateral boundary on the flow field.(7)Based on the dispersion parameters obtained from the indoor solute transport experiment,three different ways of injecting sodium hypochlorite were obtained through numerical simulation,and the sodium hypochlorite solute diffusion cloud map and ammonia nitrogen concentration distribution cloud map at different times were drawn to obtain the ammonia nitrogen removal rule and the ammonia nitrogen quality change at different times Situation,and comparatively analyze the effects of different injection methods on ammonia nitrogen pollutant removal efficiency,and select the method with the highest removal efficiency.