Waste Water Engineering
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

Trickling filters
None of these
Sludge sedimentation tanks
Imhoff tanks

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Waste Water Engineering
In case of sewer lines

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

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