Waste Water Engineering
In septic tanks,

The baffles or tees are extended up to top level of scum
Free board of 0.3 m may be provided
The clear space between the baffle top and covering slab is about 7.5 cm
All listed here

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Waste Water Engineering
In the activated sludge process

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

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