Abstract: A sewage aeration turbocompressor for continuously delivering air at a relatively low pressure to a sewage sludge treatment plant. The compressor has a housing, an impeller (10) mounted on an impeller shaft within the housing, and an electric drive motor having an output shaft coupled to and rotating in synchronism with the impeller shaft (9). The housing defines an axial air inlet (4) extending to the impeller, a diffuser passageway (12) extending radially outwards from the impeller, and a volute (13) extending from the diffuser to an air outlet. The electric motor is a variable speed permanent magnetic motor controlled by an inverter and the diffuser is vaneless. High levels of efficiency are achieved over a wide range of impeller speeds, enabling the compressor to deliver large volumes of air across a wide range of delivery rates, by designing the system to deliver optimum efficiency at a relatively low pressure rise less than 1500 millibar.

Abstract: A liquid deaerating apparatus comprises a deaerating tank housing a spray-type deaerator. The latter has a spray nozzle means for spraying the liquid to be deaerated horizontally against a surrounding liquid spray impingement absorbing and contacting means. Below the latter there is disposed packed bed means through which the liquid passes to a collection area within the deaerating tank. The packed bed through whcih the liquid percolates to the collection area comprises a high flow rate system to assist such downward flow of the liquid and release of air and gas.