Patent ID: 6254786
Filing Date: 2001-07-03
Classification: B09C

Abstract:
A process for removing secondary sources of groundwater contamination from a primary in-situ groundwater treatment process in its native aquifer wherein a portion of a primary treatment material dissolves in the stream of groundwater flowing through a primary repository and exits the primary repository in the stream of groundwater flowing through the primary repository and enters into the native aquifer; comprising forming a second repository within the aquifer downstream of the primary treatment system for containing a porous media, placing a source of oxygenating gas adjacent to a base of the second repository, placing a porous media above the source of oxygenating gas such that the porous media lies in the path of the flow of dissolved primary treatment material;placing the repository such that the flow of dissolved primary treatment material enters the repository through the upstream side thereof, the placement being such that the flow of the groundwater in the aquifer in which the second repository is located cause the flow of dissolved primary treatment material to pass from the aquifer into the second repository, pass through the second repository from side to side thereof, and exit from the downstream side of the second repository;the permeability of the porous media being such that the resistance to the passage of groundwater through the second repository is substantially no greater than the resistance of the native aquifer to the passage of groundwater through the aquifer;directing the oxygenating gas up though the porous media such that the flow of groundwater containing the dissolved primary treatment material in the groundwater is oxygenated thereby making the dissolved primary treatment material insoluble.