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Waste Water Engineering

Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

10
5
2
0.25

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Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.011
0.012
0.01
0.013

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

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Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.75 D
1.5 D
1.25 D
1.15 D

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

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

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Waste Water Engineering
‘Cowl’ is provided at

Upper end of the manhole
Upper end of ventilating column
First step in manhole
Lower end of ventilating column

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