Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

2 hours
1 hour
30 minutes
1 hour and 30 minutes

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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
Free board of 0.3 m may be provided
The baffles or tees are extended up to top level of scum
All listed here

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Waste Water Engineering
The pressure exerted by

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

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