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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

Ammonia
Carbon dioxide
All listed here
Hydrogen

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 503 upward
1 in 500 upward
1 in 100 upward
1 in 100 downward

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Rectangular
Circular
Parabolic
New egged

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Waste Water Engineering
Fresh sewage may become stale in

Three to four hours
One hour
Six hours
Two to three hours

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Waste Water Engineering
depends upon The Chezy’s constant C in the formula V = C

Size of the sewer
Shape of the sewer
Roughness of sewer surface
All listed here

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5 m
7 m
6.5 m
5.5 m

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