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Waste Water Engineering

Waste Water Engineering
The gas evolved in sewers is

Methane
Hydrogen sulphide
Carbondioxide
All of these

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25
2.65
2.55
2.5

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Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(4 + )/(18 + )] q
Q = [(18 + P)/(4 + )] q
Q = [(18 + )/(4 + )] q
Q = [(5 + )/((15 + )] q

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.085
1.065
1.095
1.075

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Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

1 in 120
1 in 60
1 in 100
None of these

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Waste Water Engineering
Facultative bacteria survive in

The absence of oxygen
The presence of oxygen
Both cases A and B
Neither A nor B

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