| 摘要 |
A clarification plant has an activation tank which is provided with a surface ventilation rotor. Activated sludge from a re-clarification tank is recycled by means of a conduit connected to the re-clarification tank, an outlet aperture thereof being located in the suction zone of the rotor. The activated sludge is sucked from the conduit into the rotor. Oxygen or an oxygen mixture is added in finely divided form to the recycled activated sludge before it enters the rotor to aerate the same.
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