Waste Water Engineering
In septic tanks,

The baffles or tees are extended up to top level of scum
The clear space between the baffle top and covering slab is about 7.5 cm
Free board of 0.3 m may be provided
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 nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

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