Waste Water Engineering
In the activated sludge process

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

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Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
All listed here
Must be of adequate size to avoid over flow
Must flow under gravity ½ to ¾ full

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