| 摘要 |
In order to obtain a more intense and quicker sewage purification and a better retaining of the activated sludge flocks in an activated sludge system with aeration tank and subsequently arranged secondary settler, the aeration tank is constructed as a sealed pressure reservoir (10) to which oxygenous gas can be supplied under pressure for dissolution in water, where the secondary settler is a flotation basin (24) and the pressure from the pressure reservoir (10) is available for flotation.
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