Study On Simulated Diffusion Of Groundwater Pollutants In A Chemical Industry Park

In the past ten years,due to the rapid development of my country’s economy,industrial parks around cities have emerged as the times require.Serious environmental problems such as soil and groundwater pollution.As an important freshwater resource,groundwater is far more difficult and costly to treat after being polluted than surface water.Therefore,the current situation of groundwater pollution and the scope of pollutant migration by heavy metals and other pollutants are studied for groundwater pollution monitoring and pollution control.provide a theoretical basis.This paper takes Fuxin Fluorine Chemical Park as the research object,analyzes the current situation of groundwater pollution through on-site investigation and groundwater sample detection,and conducts simulation research on the transport of pollutants in groundwater.The specific research contents are as follows:(1)Through the collection and sampling analysis of on-site data in the study area,according to the evaluation standard of Class III water quality in the‘Groundwater Quality Standard’(GB/T 14848-2017),the Nemerow comprehensive pollution index was used to evaluate the groundwater quality in the study area.It is not suitable for direct drinking or direct contact by residents in class III water quality.The main pollutants causing groundwater pollution are Mn,Fe and F after testing and analysis.(2)According to the relevant literature and engineering data,the hydrogeological parameters of the study area are determined by analyzing the geological,hydrological,hydrogeological and meteorological data of the study area.The groundwater solute transport model of the fluorine chemical industry park is constructed by using the MT3D module of Visual Modflow,and the model parameters are verified repeatedly.(3)Through the Visual Modflow groundwater solute transport model,a10-year solute transport simulation was carried out for the main pollutants Mn,Fe and F at No.9 sampling point,and the simulation results were the vertical and horizontal diffusion transport of pollution plumes of Mn,Fe,and F.They are 249m and 262m,260m and 200m,279m and 229m respectively,and the pollution plume spreads in an irregular elliptical shape to the southwest.The concentration of Mn,Fe,and F in the source center decreased by 10%,19%and 24%respectively,the pollutants dissipated slowly,and the concentration still exceeded the Class III standard,and was in a state of pollution.(4)In view of the current pollution situation,it is proposed to simulate the extraction of groundwater at No.9 sampling point.The amount of extracted and treated water is determined to be 50m~3/d by analyzing the geological parameters,and a 10-year solute migration simulation is carried out after the extraction.The central concentrations of F,Fe,and Mn decreased by84%,94%,and 95%year-on-year,respectively.On the 1900th day,the central concentration of F decreased to below‘Groundwater Quality Standard’(GB/T14848-2017)class III standard(1mg/L),the diffusion range was greatly reduced,and the treatment effect was obvious,which provided a theoretical basis for groundwater pollution control.This paper has 20 figures,16 tables and 97 references.