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Waste Water Engineering

Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

5 kg to 7.5 kg
0.5 to 1.0 kg
1 kg to 2.0 kg
7.5 kg to 10 kg

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Waste Water Engineering
The ratio of design discharge to the surface area of a sedimentation tank is called

Overflow rate
All of these
Overflow velocity
Surface loading

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q
d (0.285d + 0.011H)/Q

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Waste Water Engineering
In a trickling filter

Neither A nor B
Filtration process is used
Biological action is used
Both A and B

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Waste Water Engineering
A manhole is generally provided at each

Junction
All of these
Bend
Change of gradient

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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/1
D/3
D/2
D/4

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