Patent ID: 7300227
Filing Date: 2007-11-27
Classification: B09C

Abstract:
1. An apparatus for recovering non-aqueous phase liquids (NAPL) from a contaminated ground water region, comprising, a system to supply a gas-supersaturated liquid, a system of wells drilled into the ground such that they are in fluid communication with the contaminated ground water region and with an above-ground NAPL recovery system, said system of wells including an injection well in fluid communication with the system to supply gas-supersaturated liquid and with the contaminated ground water region, an extraction well in fluid communication with the contaminated ground water region and with the NAPL recovery system, and a pump for delivering the gas-supersaturated liquid through the injection well to the vicinity of the contaminated ground water region, wherein the injection well comprises a vertical well, which extends into the ground to the vicinity of the contamination source, the vertical well including a perforated portion and wherein the injection well additionally comprises a horizontal or deviated section extending below the contamination source, the horizontal section including a perforated portion, the perforations in both the vertical and the horizontal sections including injection points to deliver gas supersaturated liguid, while minimizing degassing prior to the liguid contacting the contaminated ground water region.