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

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

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Waste Water Engineering
In septic tanks,

The clear space between the baffle top and covering slab is about 7.5 cm
All listed here
The baffles or tees are extended up to top level of scum
Free board of 0.3 m may be provided

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