Patent ID: 6174107
Filing Date: 2001-01-16
Classification: B09C,C02F,E03B

Abstract:
A device for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of injection wells arranged around one or more extraction wells for purified water, wherein the reduction zone is intended for in situ precipitation or reduction of substances not desired in the ground water, and the reduction zone is created intermittently between each pair of adjacent wells,the device comprising:each injection well comprising an outer tube having a ground water carrying portion along its length, at least at the ground-water-carrying portion of its length the outer tube is apertured and water-pervious, a circulation vessel mounted at the upper end of the outer tube, a first conduit which extends downwardly within the outer tube from the circulation vessel and the first conduit ending at the height of the upper portion of the aquifer;the outer tube having a mouth, and slightly above the mouth the outer tube having a pressure inlet so as to form an upper ejector;a second conduit which extends downwardly from the circulation vessel within the outer tube, the second conduit ending at or below the middle of the aquifer and having a lower and toward the lower end, the second conduit supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube closely above the balloon body; the second conduit carrying a pressure inlet to form a second ejector;both of the pressure inlets and the balloon body being connected with one or more pressure sources.