Abstract: In order to remove underground contamination, it has already been disclosed either to replace the soil, to wash the soil, to draw off the soil air or to carry out ground water desorption. All these processes are very complex and cost intensive. In particular, they do not provide a final solution to the problem, but instead merely move the problem, since the substances removed from the water to be purified are retained and must accordingly be stored safely, for example in waste dumps. The invention is an improved process and plant of this type which is simple and inexpensive to carry out and fully degrades the substances removed from the (ground) water. The object of the invention is achieved by, on the one hand, flushing through the soil, in particular its contaminated zone (17), and, in addition, biologically purifying the (ground) water. The process and the plant are particularly suitable for removing underground water contamination by hydrocarbons on old industrial sites.

Abstract: Known types of equipment for the biological denitrification of potable water require (back) washing of the reactors from time to time. These denitrification processes proceed therefore in a discontinuous manner. The invention proposes a continuously operating denitrification process with a simple equipment arrangement. This is achieved by sumberged drum reactors (12, 14) which rotate in a first, anoxic biological stage (10) and in a second, aerobic biological stage (13). The immersion bodies (immersion body segments 31) contained in these reactors are, due to the rotation, continuously washed during the treatment of the potable water. Moreover, the sumberged drum reactors (12, 14) of the two biological stages (10, 13) are arranged according to the invention on a common drive shaft (26) with a drive element (drive motor 27).

Abstract: Known types of equipment for the biological denitrification of potable water require (back) washing of the reactors from time to time. These denitrification processes proceed therefore in a discontinuous manner. The invention proposes a continuously operating denitrification process with a simple equipment arrangement. This is achieved by submerged drum reactors (12, 14) which rotate in a first, anoxic biological stage (10) and in a second, aerobic biological stage (13). The immersion bodies (immersion body segments 31) contained in these reactors are, due to the rotation, continuously washed during the treatment of the potable water. Moreover, the submerged drum reactors (12, 14) of the two biological stages (10, 13) are arranged according to the invention on a common drive shaft (26) with a drive element (drive motor 27).