Waste Water Engineering
In septic tanks,

All listed here
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

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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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