Aerating device for aerating a sedimentation tank and sedimentation tank comprising such an aerating device

摘要

In an aerator (9) for a settling tank (1), comprising a hollow body (HB) (10) at least partially below the liquid surface (7, 8), connectable to a compressed gas source and having gas outlet opening(s) (17), the HB is at an adjustable height in the tank, is open at its lower (specifically lowest) end and has a spacing between the outlet opening(s) and the open site such that (a) at a specific first liquid level (N 1) in its interior, at the open site or between the open site and the outlet opening(s), the HB experiences an upthrust in the liquid and (b) at a second liquid level (N 2) in its interior, above the first level and below or at the outlet opening(s), no upthrust is experienced. An independent claim is included for a settling tank incorporating the aerator.