Waste Water Engineering
For a continuous flow type of sedimentation tanks

Width of the tank is normally kept about 6 m
All listed here
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute

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Waste Water Engineering
In the activated sludge process

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

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