EFFECT OF AIR MIGRATION ON VOLATILE CONTAMINANT CONCENTRATION IN SUBSURFACE ENVIRONMENT

摘要

The in-situ air sparging technology devised to facilitate contaminant volatilization andto shorten a remediation period with air injected into groundwater, was applied to thesite contaminated with volatile substances like tetrachloroethylene, toluene etc. In thissite, the short-term pilot test for air sparging was carried out to examine the migrationof injected air in groundwater, the radius-of-influence of injected air and the change ofcontaminant concentration. The result showed that injected air flowed smoothly andparabolically around the injection well in groundwater and the radius-of-influence wasabout 5 m at groundwater table. In addition, contaminant concentration declined insome monitoring wells which are placed within the radius-of-influence.