| 摘要 |
<p>The apparatus has a water transport tube (1) and a jacket tube (14). These are connected at their upper ends to give a structural unit. The water transport tube (1) is furnished along its length with one upper and one lower water permeation point (5, 8). The jacket tube (14) has a water outlet orifice (18) offset in the longitudinal direction of the tubes (1, 14) in relation to the upper water permeation point (8). A gas injection tube (11) is introduced from outside into the water transport tube (1), which injection tube is of such a length that the gas outlet orifice is beneath the upper water permeation point (8). A gas outlet tube (15) is connected to the space (13) between the water transport tube (1) and the jacket tube (14) surrounding this tube, through which outlet tube gas held in the space (13) and containing the pollutants from the ground water can be supplied to a filter (19). <IMAGE></p> |
