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

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
None of these

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Waste Water Engineering
Skimming tanks are

Improved version of grit chambers
Used to remove the grease and oil
Tanks provided with self- cleansing screens
Those from which sludge is skimmed out

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