Study On The Migration And Distribution Of Ecological Environment Damage Caused By Informal Landfill In Shanghai

In recent years,with the continuous acceleration of urbanization,people’s living standards are improving rapidly,and the amount of garbage is also increasing rapidly,among which informal landfill garbage has caused great harm to the ecological environment.In this study,the common informal landfill area is taken as an example to provide an important reference for scientific assessment of the damage to the ecological environment caused by the informal landfill area by analyzing its pollution source,ecological environment damage object and migration and diffusion range of characteristic pollutants.This study a informal landfills in Shanghai area as the research object,through field investigation,sample collection,analysis,testing,etc.,determine the characteristics of pollutants in informal landfills,confirmed its on surrounding soil,groundwater and damage characteristics of plants,and on this basis,further analysis of characteristics of pollutant diffusion and spatial distribution characteristics.The main results are as follows:(1)The main components of the landfill in the informal landfill area are domestic waste and construction waste,and the main characteristic pollutants are heavy metals Mn,Cr,Cu and Zn.(2)The content of characteristic pollutants in the informal landfill area,surrounding soil,groundwater and main plants exceeds the heavy metal content of the environmental criteria,indicating heavy metal pollution of the surrounding environment.(3)The contents of heavy metals Mn,Cr,Cu and Zn in the soil around the informal landfill area gradually decreased with the increase of the distance in horizontal and vertical space.The range of soil heavy metal pollution in horizontal gradient is over 30 m.In the horizontal range of 0～5 m,soil heavy metal pollution was mainly concentrated in the surface layer of 0～80 cm.The soil heavy metal pollution in the vertical gradient beyond the horizontal range of 5 m was more than 8 m.(4)The distribution of heavy metals Mn,Cr,Cu and Zn in groundwater around the informal landfill area decreases with the increase of the distance,and the pollution radius is more than 80 m.(5)Among the plants around the informal landfill area,Arachnoid spp.could be used as Cr indicator and hyperaccumulator,Matang could be used as Cu indicator and hyperaccumulator,the contents of heavy metals in different organs of Privet showed no significant difference,and Koelreuteria paniculata could be used as heavy metal root accumulator.To sum up,informal landfill disposal area in Shanghai and its surrounding environment characteristics of pollutant mainly for heavy metal Mn,Cr,Cu,zinc,through the analysis on the soil,groundwater and the diffusive characteristics in plants,similar to the informal landfill disposal area pollution range and determine to provide important reference for the practice of damage.