Author(s)

Jun HOU

Corresponding Author

Jun HOU

Abstract

With the development of modern industry and the intensification of human activities, a large number of pollutants are discharged, which makes the environmental quality of the atmosphere, soil, rivers and lakes deteriorate day by day, seriously affecting the sustainable development of industrial and agricultural production and people's life and health. In this paper, field irrigation experiments were carried out in typical areas with high arsenic groundwater distribution, and the effects of irrigation on hydrogeochemical processes and sediment geochemical characteristics of unsaturated zone were simulated. On this basis, the mechanism of arsenic migration and transformation in unsaturated zone under the influence of irrigation activities was discussed. Soil bulk density, soil moisture content, adsorption coefficient, convection velocity, hydrodynamic dispersion velocity, adsorption degradation, emission mode of pollution sources, boundary conditions and other factors affect the migration process of pollutants in soil to varying degrees. Soil has a certain adsorption and purification capacity for arsenic. In the adsorption reaction, the adsorption capacity of arsenic increases with the adsorption time until saturation.

Keywords

Arsenic, Groundwater, Soil, Migration transformation