Waste Water Engineering
In case of sewer lines

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

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Waste Water Engineering
In the activated sludge process

Water is removed by centrifugal action
Sludge is activated by constant stirring
Aeration is continued till stability
Aeration is done with an admixture of previously aerated sludge

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