NUMERICAL SIMULATION OF POLLUTED SITES BASED ON COMSOL THERMAL ENHANCEMED SVE TECHNOLOGY

In this paper, COMSOL simulation software was used to simulate the thermal response unit of SVE technology with a scale of 2 m×2 m×1 m, for the temperature field variation of 1 m depth below the surface and the migration state of pollutants in the plane with a depth of 0.5 m below the surface. The temperature field simulation of the scale model showed that when the heat source power was 80 kW/m³ with a duration of 70 h, the highest and lowest temperature of the site reached the stable values of 2500 K and 500 K, respectively. And then velocity field was applied at this temperature, when the negative pressure of pumping hole reached 101.325 kPa, and the peak migration velocity reached 0.3 m/s at 6 min. Migration velocity showed a most obvious decline in 6~10 min and got basically stable after 10 min. Therefore, most of the symbolizing pollutants had been removed in 10 min, followed by the trailing effect that was commonly seen in actual projects.