| 摘要 |
APPARATUS AND METHOD FOR REMOVING Hazardous volatile contaminants are removed from the ground by circulating air between two substantially parallel wells and by removing the vapors of the contaminants from the circulated air using at least one of a condenser and a demister. To enhance efficiency the air is recirculated in a closed loop. The heat output of the condensation process is used to heat the recirculated air which at reinjection into the ground has a temperature higher than ambient ground temperature. Pipes having openings along only a limited portion of their lengths are placed in the wells and the depth of the openings adjusted to treat one level at a time, thereby preventing shunting of air through more porous soil layers. Flow rates can be equalized by using circumferentially placed induction wells surrounding an extraction well (or the reverse) and by controlling air flow through individual sections of a given level.
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