Waste Water Engineering
Hume steel pipes are

Steel shell coated from inside with cement mortar
Both B and C
Steel shell coated from outside with cement mortar
Steel pipes

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Waste Water Engineering
In the activated sludge process

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

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