The Study On The Migration Of Heavy Metals In Sediments Of Rainwater Pipes (Ditch) In Minging Area

With the rapid development of the economy,China's exploitation of mineral resources has increased sharply.A large amount of residual heavy metal pollutants will be generated in the surrounding rainwater pipe(ditch)sediment environment during mining activities.Heavy metals will eventually migrate to the receiving water river Le'an River and cause secondary pollution,making it difficult to completely control heavy metal pollution in water river.In order to explore the migration law of heavy metals in the rainwater pipe(ditch)sediments,this paper takes the heavy metals in the rainwater pipe(ditch)sediments in the Dexing copper mine area as the research object,and samples and tests the samples and further the total amount of heavy metals under different periods of rainfall intensity.Measured data for migration change analysis.At the same time,a one-dimensional mathematical model of heavy metal migration in stormwater pipe(ditch)sediment was established based on the mechanism of heavy metal migration in the sediment environment.The software Fluent18.0 was used,and the finite volume method was used for numerical solution.The calculation models of heavy metal migration in the rainwater pipe(ditch)sediments at three different periods were established.The computer simulation results were verified with the measured values.The rainwater pipe(ditch)in the mining area was obtained.Heavy metals migration in sediments.The research results can provide scientific guidance for the thorough treatment of heavy metal pollution in water bodies,and also provide a theoretical basis for the treatment of heavy metal pollution in mining areas.The main results of the full text are as follows:(1)On the basis of comprehensive mining area investigation and analysis,a large amount of literature has been consulted,and the sediments are considered as porous media containing pores,and fluid flow and pollutant mass transfer are performed in the pores.Based on the migration and transformation mechanism of pollutants,a one-dimensional mathematical model of heavy metal migration was established and the definite conditions of the mathematical model were given.The finite volume method was selected to numerically solve the control differential equation.(2)The calculation model of heavy metal migration in rainwater pipe(ditch)sediments in runoff direction in different periods was established with Fluent18.0.The velocity of water flow in different periods and the initial concentration of each component of heavy metals were defined at the velocity entrance.After the model converged,the heavy metals at the exit were monitored The concentration of each component.The simulation results are compared with the measured values of heavy metals in different periods.The calculated values of the model are basically consistent with the measured values,indicating that the mathematical model established is basically reliable.(3)From the simulation results of the model calculations during the dry season,the flat season,and the high season,when the model reaches convergence under the action of the current at the velocity inlet,the various components of the pollutants are uniformly distributed in the model channel,and their concentrations do not change.Under the optimal computer simulation conditions,the concentration of the pollutant components monitored at the exit of the model is close to the measured value.The migration simulation results in three periods show that: Under the continuous scouring of the water flow,during the migration of the pollutants in the rainwater pipe(ditch)sediments,under the ideal condition of the channel,the concentration of each component of the pollutant basically does not change with time and the length of the flow.Over time,heavy metals in rainwater pipe(ditch)sediments will continue to migrate with the flow of water.If no measures are taken,pollutants are likely to eventually migrate to the receiving water river and cause secondary heavy metal pollution.This provides scientific guidance for the thorough treatment of heavy metal pollution in water river.