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Waste Water Engineering

Waste Water Engineering
A rain sanitary sewer is constructed to carry

Storm sewage
Ground water
Surface water
Sanitary sewage

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

4 years
3.5 years
5 years
3 years

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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

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

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/4
D/1
D/2
D/3

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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

1 hour and 30 minutes
2 hours
1 hour
30 minutes

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Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Nitrogen
Oxygen
Sulphur-dioxide
Carbondioxide

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