Study On The Status Quo And Case Analysis Of Typical Polluted Sites In Anhui Province

With the development of the economy in Anhui Province,industrialization and urbanization continue to advance,and the transformation and upgrading of industries at all levels continue to deepen.Many relatively backward enterprises have been shut down or relocated by the government during urban development,leaving behind a large area of land polluted by pollutants from previous production processes of enterprises on the original site.Among the 36 polluted sites in Anhui Province,the main ones are the chemical industry and metal related industries,with 21 chemical industries accounting for 58.3%;There are 9 metal industries,accounting for 25%.The total area of contaminated sites in Anhui Province is 4731587.77 square meters.This article takes a certain site in Hefei as a typical polluted site for research.Based on the data collected in the early stages such as on-site investigation and document collection,the source and degree of pollutants in the site are analyzed,and the characteristic factors of the site are identified.Sampling points are set up and analyzed in the surface,middle,and deep layers.Determine the ammonia nitrogen,heavy metals and SVOC in the soil,analyze the pollution situation of the industrial site by using different evaluation standards,study the concentration distribution of each pollutant,and carry out pollution assessment on the current situation of the site soil pollution.On this basis,use the ordinary Kriging method in GIS to carry out spatial interpolation,and make the spatial distribution map of each element;The single factor pollution index method and Nemero comprehensive pollution index method were used to analyze the status of each element pollution in the soil of the study area,and the EVS.Pro software was used to analyze the site soil pollution and water pollution.The main research content and conclusions are as follows:1.The ammonia nitrogen in the study area is based on the screening value of soil environmental health risk assessment in Shanghai(trial)as the reference standard,while heavy metals and SVOC are based on the screening value of soil pollution risk in construction land.Through sample data analysis,it is found that there are many contaminated sample sites for each pollutant.2.After processing the sample data using the single factor index method and the Nemero index method,it was found that ammonia nitrogen exceeded the standard seriously.In the heavy metal pollution data,the cumulative index method was combined to analyze the soil heavy metal pollution status.After analysis,the exceeding pollutants are Cu,Cd,and Zn,and the exceeding points are also relatively concentrated,mainly in sewage treatment areas and office areas.By using GIS software to create spatial distribution maps of various pollutants,combined with EVS.Pro software to analyze soil pollution volume and water pollution area in a three-dimensional manner.It was found that the distribution of various pollutants in soil samples from chemical sites is relatively concentrated,with the largest range of ammonia nitrogen pollution among them.Overall,the main pollution in the site comes from ammonia nitrogen,with the widest distribution area,and relatively few points where heavy metals and SVOC exceed the standard.The main pollutant in the soil of the metal site is SVOC,mainly distributed in the surface(0-2m)range;The main pollutants in groundwater are ammonia nitrogen,manganese,and total hardness,and each pollutant is mainly distributed in sewage treatment stations.