| 摘要 |
1. Process for the biological purification of waste water, in which the waste water is mixed with activated sludge in an activated sludge basin in the presence of carrier particles for microorganisms, and an oxygen-containing gas is passed in, the waste water/activated sludge mixture is then passed, via an outlet into a secondary settling tank while retaining the carrier particles, and purified waste water and activated sludge are separated in the secondary settling tank, and in which activated sludge is transported back from the secondary settling tank into the activated sludge basin, characterized in that the carrier particles are retained, with the aid of a partition which is impermeable to carrier particles, in a region of the activated sludge basin which is in front of its outlet and in which the flow rate of the waste water/activated sludge mixture is low compared with that at the outlet, additional gas being introduced in front of and behind the partition, and in that the introduction of additional gas behind the partition is carried out below the introduction of additional gas which takes place is front of the partition and far below the outlet opening of the activated sludge basin, and the introduction of additional gas is adjusted so that the carrier particles present in front of the partition are forced away from the latter. |
