Waste Water Engineering
Kjeldahl nitrogen is a mixture of

All listed here
Organic nitrogen and ammonia
Ammonia and nitrogen
Nitrogen and organic nitrogen

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Waste Water Engineering
In case of sewer lines

Obstruction test is carried out with the help of smooth ball of diameter 13 mm
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
All listed here

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