Aerator for oxygenating a liquid

摘要

The invention provides an aerator (10) for the oxygenation of a liquid during water purification or water aeration. The aerator (10) includes a standpipe (12), a support (14) for supporting the standpipe (12) above or within a liquid, and an air inlet (78) for allowing air into the standpipe. A disperser (16) depends from the standpipe (12), and a rotor (36) is located at least partly within the disperser (16). The aerator (10) also includes an impeller (40) which comprises a hub (41), and a plurality of spoke formations (42) extending radially from the hub. The impeller (40) is arranged so that some of the spoke formations (42) are aligned with the rotor blades (38) and some of the spoke formations (42) are aligned with gaps between the rotor blades (38), and the diameter defined by the impeller (40) is larger than the diameter defined by the rotor (36).