| 摘要 |
PCT No. PCT/SE91/00464 Sec. 371 Date Mar. 3, 1993 Sec. 102(e) Date Mar. 3, 1993 PCT Filed Jun. 26, 1991 PCT Pub. No. WO92/00918 PCT Pub. Date Jan. 23, 1992.The present invention refers to a process 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. The zone desired is created intermittently between each pair of adjacent injection wells by (i) introducing oxygen, oxygen-containing gas or an oxygen-releasing substance (or an oxygen-consuming substance) into the water in both wells and (ii) pumping the water in one well from below upwards while pumping the water in the other well from above downwards, whereby a circulation circuit is formed in the aquifer between the wells. A device for carrying out said process comprises an outer tube (1), sealing means (2), an inner tube member (3), a transversal wall (4) with a central opening, an elongation tube (5), an inner flow pipe (6) and conduits (7,8) for supply of air. |
