Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Sewer line runs along a main road
Two sewer lines intersect
Invert level of a branch sewer is more than 60 cm that of the main sewer

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Waste Water Engineering
In the activated sludge process

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

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