Abstract
Oxygen transfer rates, or standard aeration efficiencies (SAE) were measured using seven paddlewheel impellers at three salinities (0, 11 and 22‰) and with two aeration devices (0.37 and 0.75 kW) in clean water tests. Oxygen transfer rates increased significantly at higher salinities. With the 0.37-kW aerator, mean SAE values increased 67% at 11‰ compared with freshwater (0‰), while SAE increased 46% at 11‰ with the 0.75-kW aerator. SAE values increased further at 22‰, but the increases were much less. These findings clearly demonstrated a significant salinity affect on oxygen transfer efficiencies with paddlewheel aerators.
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