Waste Water Engineering
In the activated sludge process

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

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Waste Water Engineering
Skimming tanks are

Tanks provided with self- cleansing screens
Those from which sludge is skimmed out
Used to remove the grease and oil
Improved version of grit chambers

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