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Waste Water Engineering

Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Both A and B
Concreting
Raising low lying areas by dumping
Neither A nor B

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Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
All of these
The shape is rectangular

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Waste Water Engineering
The discharge per unit plan area of a sedimentation tank, is generally called

Surface loading
Over flow rate
Over flow velocity
All of these

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 – P1)/(100 – P2)] V1
[(100 – P1)/(100 + P2)] V1
[(100 + P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1

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Waste Water Engineering
Flocculated particles do not change their

Weight
None of these
Size
Shape

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Invert level of a branch sewer is more than 60 cm that of the main sewer
Two sewer lines intersect
Sewer line runs along a main road

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