Waste Water Engineering
Traps

Are water seals which prevent the entry of foul gases
Create symphonic action to increase the quick disposal of sewerage
Are used to trap the rats entering sewers
Dissolve the foul gases

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

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