Waste Water Engineering
The pressure exerted by

The sewage when running full from inside, is called internal pressure
All listed here
The internal pressure if any, causes tensile stress in the pipe material
Pressure sewers are designed to be safe in tension

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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