Waste Water Engineering
In case of Imhoff tanks,

Detention period is 2 hours
The shape is rectangular
All of these
The velocity of flow is restricted to 0.30 m/minute

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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
Nitrogen cycle of sewage, is

Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

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