Study On Groundwater Ecological Risk Assessment In Chemical Industry Zone

As an important part of the ecosystem,groundwater is an important pillar for maintaining sustainable ecological development.Due to the impact of environmental changes in recent years,people's living and production water consumption has increased sharply.In addition,the groundwater in some areas has been polluted,resulting in a gradual deterioration of the groundwater ecological environment.Selecting a typical chemical industry zone for groundwater ecological risk assessment in this area can highlight the groundwater ecological status of Liaoning Province as an old industrial base industrial area,and reflect the vulnerability of groundwater in the area,which provides a reference for groundwater protection in the future.This paper selects a typical chemical industry area in a city of Liaoning Province for groundwater ecological risk assessment.Through field research,data collection and sample collection and testing,the vulnerability(essence,special),groundwater value function and ecological risk of aquifer soil were comprehensively evaluated.The main conclusions are as follows:(1)The inherent vulnerability of the plant area is increased from slight fragility to general fragility from the center of the plant to the edge of the plant,indicating that the groundwater in the plant has strong anti-pollution ability under natural conditions.After the weighted superposition with special vulnerability,the comprehensive vulnerability of groundwater in the ex-factory area is relatively fragile,and the human effect plays a leading role in this evaluation.(2)The functional evaluation of groundwater value,selected five heavy metal elements including Cu,Zn,Cr,Cd,Hg and two organic indicators naphthalene and DDT as the evaluation index,using Nemero comprehensive evaluation method for single good evaluation measured most points Grade IV water quality indicates that the groundwater quality in the test area of the plant is polluted,the groundwater quality level is low,and the water quality is poor.Combined with local data,the groundwater quantity is superimposed on the level of groundwater exploitation resource and groundwater exploitation level.The water quality and water quantity are superimposed to evaluate that the groundwater pollution hazard level in the ex-factory area is medium level and the groundwater value function is medium.(3)Ecological risk assessment based on aquifer soil.The soils with different depths in the typical test area of the central area of the plant were selected,and heavy metal elements such as Cu,Zn,Cd,Ni,As,Pb and Cr were selected as evaluation indexes.Analyze the vertical direction of each indicator.Cu,Zn,and Cd are stable,and Ni,As,Pb,and Cr are fluctuating.The potential ecological hazard of the soil in the test area is slight,except for Cd,which is slightly polluted,and other monitoring indicators are within the range of natural background values.