DISPLACEMENT OF NONWETTING LIQUIDS FROM UNSATURATED SANDS BY WATER INFILTRATION

Xylene was spilled onto moist glass beads or various moist sands and w ater was trickled onto the columns every eight hours for periods up to 10 days. The xylene residual in the columns with water infiltration d ecreased compared to those of control columns, indicating a downward d isplacement of xylene. The extent of displacement increased with incre asing size of the porous media and with increasing amounts of wafer in filtration.