Waste Water Engineering
A drop manhole is provided if

None of these
A lamp is inserted to check obstruction
A branch sewer joins the main sewer at higher level
A sewer drops from a height

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Waste Water Engineering
Traps

Dissolve the foul gases
Create symphonic action to increase the quick disposal of sewerage
Are water seals which prevent the entry of foul gases
Are used to trap the rats entering sewers

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

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