Abstract
This work provides a three-dimensional discrete element simulation (DEM) model to study the air sparging technology. The simulations have taken into account the multi-phases of bubble (gas) - fluid (water) - soil (solid) particles. Bubbles are treated as discrete individual particles, with buoyancy and drag forces applied to bubbles and soil particles. The trajectory of each discrete bubble particle can be tracked using the discrete element model. It is found that the diffusion of the whole bubble is inverted conical though the motion behavior of a single bubble particle is random. Furthermore, the distribution of the radius of influence (ROI) is not uniform. The bubbles become more concentrated as in the center of the inverted cone. The number of bubbles dissipated from the water surface is normally distributed. The DEM simulation is a novel approach to studying air sparging technology that can provide us a deeper insight into bubble migration at the microscopic level.
Highlights
As human society evolves and the city scale expands, researchers are becoming more interested in environmental restoration and reuse of contaminated sites, owing to the increasing value of environmental protection and land re-utilization
radius of influence (ROI) is a significant metric that indicates that as bubbles concentrate away from the liquid surface, the area becomes cleaner as more volatile organic contaminants (VOCs) are eliminated
Similar to balls moving in nails, bubbles in the spaces of soil particles eventually overflow the water in large quantities from the central area
Summary
As human society evolves and the city scale expands, researchers are becoming more interested in environmental restoration and reuse of contaminated sites, owing to the increasing value of environmental protection and land re-utilization. A coarse-graining DEM for the complex shaped domain has been applied by Mori et al [18] to model an arbitrary shape wall boundary in a gas-solid flow and has been validated by experimental tests, demonstrating that the method is capable of accurately modeling industrial gas-solid two-phase systems. These investigations primarily focused on the movement and shape change of a single or several large bubbles. The study systematically explores the air sparging angle under different conditions as well as the ROI using statistical analysis
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