Waste Water Engineering
In septic tanks,

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

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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