Apparatus for contacting a gas with a liquid, in particular for aerating waste water

摘要

An apparatus for aerating waste water comprising a surface aerator adapted to rotate about a vertical axis. A cap is disposed over the aerator and is modified to improve the operation of the apparatus. The waste water flows in a closed circuit and a partition is provided separating the parts of the circuit lying upstream and downstream of an aeration zone. The surface aerator is arranged in an aeration zone in the neighborhood of an end of the partition.