Waste Water Engineering
In the activated sludge process

Aeration is continued till stability
Sludge is activated by constant stirring
Water is removed by centrifugal action
Aeration is done with an admixture of previously aerated sludge

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Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Rectangular septic tanks
Circular septic tanks
Circular Imhoff double tanks with bottom hoppers

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