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Waste Water Engineering

Waste Water Engineering
The maximum depth of sedimentation tanks, is kept

3 m
4 m
4.5 m
3.5 m

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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/2
D/4
D/1
D/3

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Waste Water Engineering
‘Cowl’ is provided at

Lower end of ventilating column
Upper end of the manhole
First step in manhole
Upper end of ventilating column

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.84 D
D’ = 0.94 D
D’ = 0.64 D
D’ = 0.74 D

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Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Ferric chloride
Chlorinated coppers
Ferric sulphate
Alum

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Waste Water Engineering
Dry water flow in a combined sewer, is

Inclusive of domestic and industrial sewage but excludes storm water
Storm water
Domestic sewage
Industrial sewage

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