Fully biological small sewage treatment plant with two ventilated aeration tanks

摘要

Fully biological small sewage treatment plant with two activated sludge tanks (4, 5) with means for transferring at least a part of the filling of one activated sludge chamber into the other, in cycles with successively to be traversed phases, namely a first phase in which an intermittently operated ventilation takes place in the waste water is enriched with oxygen and mixed and circulated at the same time, and a second phase in which a sedimentation takes place and at the top of a clear water zone of purified wastewater is formed, is operable in the first aeration tank (4) the inlet of cleaning effluent takes place and from the second aeration tank (5) the withdrawal of the clear water takes place, wherein in each aeration tank (4, 5) each have a ventilation device (9, 11) is arranged, wherein the two activated sludge tanks (4, 5) in a common container (1) are formed by a partition (3), wherein in the first aeration tank ( 4) a device (10) for transferring prepurified wastewater from the first aeration tank (4) into the second activation tank (5) is arranged, which has a mammoth pump, which extends with its suction in the first aeration tank (4) and at least partially is surrounded by a cleaning rake, which has discharge slots in the upper area, and wherein in the partition (3) a return from the second aeration tank (5) in the first aeration tank (4) is arranged, which has a tube (14).