Waste Water Engineering
In case of sewer lines

Test for straightness is carried out with the help of a lamp and mirror
Water test is carried out to check water tightness of the joints
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
All listed here

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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