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Waste Water Engineering

Waste Water Engineering
The sewage treatment in septic tanks is due to

Anaerobic decomposition
None of these
Parasitic decomposition
Aerobic decomposition

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Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Sag pipe
all of these
Inverted syphon
Depressed sewer

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Width of the tank is normally kept about 6 m
Maximum horizontal flow velocity is limited to 0.3 m/minute
Length of the tank is normally kept 4 to 5 times the width
All listed here

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Waste Water Engineering
Fresh sewage is generally

Highly decomposed
Alkaline
Acidic
A source of objectionable odour

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Waste Water Engineering
Antisyphonage pipe is fitted

At the beginning of sewer line
On manholes
At the end of septic tanks
With a W.'trap

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Waste Water Engineering
The design period in years for pumping plants, is

5 to 10
2 to 3
3 to 5
1

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