Waste Water Engineering
The pressure exerted by

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

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

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

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