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Waste Water Engineering

Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

CO₂
CO₂
SO₂
O₂

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

None of these
Slightly less than 5% of the design discharge
Slightly more than 5% of the design discharge
20% of the design discharge

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Waste Water Engineering
Fresh sewage may become stale in

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

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Hydrology
Temperature
Dissolved oxygen in water
All listed here

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Chezy
Manning
Bazin
Kutter

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Waste Water Engineering
Dried sewage after treatment is used as

Building material
Fertilizer
Chemical for lowering B.O.D.
Base material for paints

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