B - Operations – Transporting – 08 – B
Patent
B - Operations, Transporting
08
B
71/51, 71/55
B08B 3/10 (2006.01) B09C 1/00 (2006.01) E21B 43/24 (2006.01) E21B 43/40 (2006.01)
Patent
CA 2011831
-23- APPARATUS AND METHOD FOR REMOVING Abstract Hazardous volatile contaminants are removed from the ground by circulating air between two substan- tially 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 induc- tion wells surrounding an extraction well (or the reverse) and by controlling air flow through indivi- dual sections of a given level.
Donnelly Lawrence A.
R. William Wray & Associates
LandOfFree
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