Study On The Influence Of Construction Of Ash Storage On Groundwater Environment

In recent years,with the continuous progress of industry and agriculture and the improvement of people's life quality,the power consumption in production and life is increasing day by day.In China's power supply,coal power is in an absolute dominant position.The disposal and storage of a large number of ash generated by coal combustion has become a key issue affecting the regional ecological environment.At present,the treatment measures for most of the coal ash in China are landfill and comprehensive utilization,especially landfill.In the landfill and storage of ash,due to poor management,a large number of toxic and harmful substances such as heavy metals,fluorides and arsenides are often introduced into the groundwater under the action of precipitation and groundwater leaching,which poses a major threat to the regional groundwater environment.In this paper,a proposed ash storage site is taken as the research object.Through data collection,field survey,sampling analysis and groundwater numerical simulation,the migration rule of ash leachate is predicted,and then the possible impact on groundwater environment is analyzed.Through the research,we found that:1.The type of groundwater in the study area is mainly Quaternary loose rock pore water,and the recharge item is mainly atmospheric precipitation infiltration supplement,followed by the lateral runoff supplement of the upstream section of groundwater.Generally,the regional groundwater flows from north to south,and finally discharges in the Yellow River.2.The study area belongs to the drainage area of groundwater,which is mainly controlled by evaporation and concentration.The TH,NH₄⁺,COD_Mn,Cl^-,Mn,Na⁺,and total coliform groups of some well water exceed the standard.The over standard of Mn is caused by the local rock properties,and the over standard of other indicators is related to human activities.3.According to the numerical simulation results,under normal conditions,the F^-3000 day pollution moved 185 meters horizontally and540 meters vertically;under accident conditions,the F^-3000 day pollution moved 80 meters horizontally and 200 meters vertically;in both cases,the concentration after 3000 day F^-diffusion did not exceed the standard.