Research On Groundwater Environmental Impact Prediction Of A Chemical Plant In Qinggang County Based On GMS

Groundwater is an important resource of production and life in our country.In many arid and semi-arid areas,groundwater is even the only source of water.However,groundwater pollution is difficult to detect,has a strong concealment,high repair costs and limited effects.It is very important to predict the impact of pollutant leakage on groundwater and to choose which control measures to reduce the impact degree and scope of influence.This paper takes a chemical plant in Qinggang County as the research object,selects its independent hydrogeological unit as the study area,establishes three-dimensional geological model and hydrogeological model,simulates the groundwater flow field in the study area,and predicts the pollutant transport.The optimal pollutant control measures were compared.?1?the model boundary of the study area is determined by geological plane map,geological profile map and geological borehole data,and some virtual geological drilling holes are added reasonably.The three-dimensional geological model of the study area is constructed by using Solid and Borehole modules of GMS software combined with geological data.The stratigraphic lithology and aquifer distribution of the study area are analyzed according to the simulation results.?2?based on a series of hydrogeological parameters,such as boundary type,hydrogeological parameters,aquifer model,gridding model and source and sink term,based on three-dimensional geological model,the groundwater flow field of aquifer is numerically simulated by MODFLOW module in GMS.The hydrogeological model of the study area is established by identifying and verifying the distribution of groundwater flow field in the study area.?3?on the basis of hydrogeological model,the MT3DMS module in GMS was used to predict the migration distance of SO₄^2-in leachate with time and the range of exceeding the standard under the condition of abnormal continuous leakage of furfural waste leachate.The results show that if the leakage amount of SO₄^2-is 16 kg/d,the maximum migration distance of SO₄^2-is 714m,which exceeds the standard range of192080 m².If the leakage amount of SO₄^2-continues to leak for 20 years,the maximum migration distance is 714m.?4?according to the forecast result of MT3DMS,the pollution prevention and control measures are put forward,and the pollution control effect of different schemes is controlled by quantitative comparison.The combined scheme of two pumping wells with a discharge of 35 m³/d and a 100 m cutoff wall can effectively prevent SO₄^2-from polluting groundwater.20 years later,the maximum migration distance of SO₄^2-in groundwater is 168m,and the limit of exceeding the standard is 83300 m².Compared with natural diffusion,it decreased by 76.5%and 56.6%,respectively.