| 摘要 |
Filler material of the variety under consideration must, in the case of biological water treatment in particular, provide optimum hold for the "biological lawns" necessary for this purpose and a uniform wetting capability. In known strip-shaped filling materials it has been demonstrated that the strips stretch themselves smooth under loading and thereby offer a poor hold for the "biological lawn" as well as a tendency to adhere to one another. The new material is claimed to avoid this disadvantage and to be simple to manufacture and install. The new material has at least one tension feature (29) applied to the strips (20). This takes up the load when the strips are suspended, so that the strips (20) remain essentially unloaded and consequently retain the profile given them during manufacture. The filler material is particularly suitable for the biological treatment, namely de-nitrification, of waste water or drinking water. …<IMAGE>… |
