Study On The Migration Characteristics Of Heavy Metal Pollutants In The Interior Of Soil Based On The Electromotive Action

With the advancement of China’s urbanization process and the rapid development of industrial and agricultural production,the problem of heavy metal pollution in soil is becoming more and more serious,and its repair is an environmental problem that needs to be solved urgently.Based on the background of the trend of electric remediation,the concept of transparent soil was introduced,and the soil parameter,the voltage and the pollutant concentration are taken as the influencing factor.This paper takes heavy metal pollutants Cu,Cr,Ni as the research objects and uses the method of CEDX energy dispersive spectrometer,carries out a series of tests of heavy metal pollutants in transparent soil and sand under electromotive action,taking the sand particle size the voltage and the pollutant concentration as factors.And analyses the horizontal and vertical micro-interface migration patterns based on the exploration of the feasibility of the application of transparent soil in the study of heavy metal pollution.To provide theoretical basis and method support for the electric restoration of heavy metal contaminated soil in practical engineering,the main conclusions are as follows:(1)Relying on transparent soil to study the migration of heavy metal pollutants in soil is feasible.Multi-point plane recombination confirms that the law of heavy metal migration in transparent soil is consistent with the corresponding sand.The vertical and horizontal and plane concentration spree simulation accuracy is greater than 94.85%.(2)Under the electromotive action,the migration of heavy metal pollutants in the soil is affected by the dual effect of electric field suction and gravity.For the heavy metal pollutants in the state of acid root negative ions,the concentration in horizontal is gradually decreasing trend from anode to the cathode,and there is a aggregation effect near the anode electrode,while the heavy metal exists in ion form will move in the opposite direction.The migration direction of heavy metal pollutants is related to its state of assignment and the charge.(3)The voltage,soil parameters,the type and concentration of pollutant all affect the migration of heavy metals in the soil.Caused by the increase in the initial concentration of the pollutant,the residual concentration of heavy metal increases in each test.The increase of voltage and particle size helps to speed up the migration of heavy metal ions.Through the orthogonal test analysis,the influence degree of each factor of Cr Cu Ni polluted transparent soil is the type> voltage > initial concentration of heavy metal pollutant.(4)Under the condition of mixed heavy metal pollution,the pollutants are presented in the similar law of the single pollution condition.Cr and Cu,Cr and Ni,Cu and Ni,Cu and Ni simultaneously promote each other’s migration under low concentration conditions,and the heavy metals have mutual inhibition under high concentration conditions.