Growth and Migration of Gas Bubbles for In-situ Bioremediation

摘要

The insitu bioremediation of contaminated land can often involve the injection on production of biogenic gas bubbles in the subsurface. The flow patterns for such gas bubbles and the effects on aqueous permeability are both complex and difficult to predict. A series of optical tests were carried out using an artificial sand to directly observe the growth and migration of gas bubbles for different injection rates, pore water pressure, injection point and soil heterogeneity. The results provide information on the relative size and stability of bubbles, the mode of upward movement in saturated sand and the obstructions presented by slight changes in soil grading. The results can be used to predict airflow patterns for soil column and field studies and potential effects on groundwater flow for in-situ bioremediation.