Waste Water Engineering
At the junction of sewers

Top of smaller sewer is kept lower
Top of larger sewer is kept lower
None of these
Tops of both the sewers are at the same level

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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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