Abstract
Propeller-aspirator-pump aerators transferred oxygen to water more efficiently at salinities of 10–30 ppt than at lower salinities. Oxygen transfer by Taiwan-style paddle wheel aerators was unaffected by salinity in the range of 0–30 ppt. One brand of propeller-aspirator-pump aerator had an aeration efficiency about 1·5 times greater than the Taiwan-style paddle wheel aerators at salinities of 10–30 ppt (aeration efficiencies averaged 1·20 and 0·85 kg O 2/kWh −1, respectively). In the same salinity range, the second brand of propeller-aspirator-pump aerator had aeration efficiencies roughly equal to the Taiwan-style paddle wheel aerators.
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