Waste Water Engineering
The pressure exerted by

The sewage when running full from inside, is called internal pressure
Pressure sewers are designed to be safe in tension
All listed here
The internal pressure if any, causes tensile stress in the pipe material

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

None of these
A sedimentation tank and an activated sludge treatment plant
Sedimentation tanks with high rate trickling filters
A plant consisting of Imhoff tanks with low rate trickling filters

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