Activated sludge tank

摘要

The activated sludge tank for the purification of waste waters by activated sludge has a mixing vessel (1), which is connected by the principle of communicating tubes to a sludge separator (9, 10), and a regenerator (18) of the activated sludge which is connected to an outlet (12) of the returned sludge of the sludge separator (9, 10) and to the vessel (1) for feeding the regenerated activated sludge into this. The vessel (1) is furnished with at least one vertical impeller aerator (23, 24), which is provided with a suction nozzle (25, 26), the inlet end (27, 28) of which communicates with the regenerator (18) and the outlet end (29, 30) of which is furnished with a funnel (31, 32) in which the impellers (33, 34) of the aerator (23, 24) are arranged. In this case, the sludge separator (9, 10) is furnished with a regulator (38) of the dynamic level of the sludge medium, and the upper edge (35, 36) of the funnel (31, 32) of the nozzle lies above the dynamic level of the sludge medium in the mixing vessel (1).