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Waste Water Engineering

Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Aerobic bacteria
Both types of bacterias
None of these
Anaerobic bacteria

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

None of these
1 in 100
1 in 60
1 in 120

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

4 m
3 m
4.5 m
3.5 m

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Waste Water Engineering
Chlorination of water is done for the removal of

Bacterias
Suspended solids
Sediments
Hardness

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

Overflow rate
Overflow velocity
All of these
Surface loading

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Waste Water Engineering
A sewer running partially full and hurried with back filled, fails in compression due to

Superimposed traffic loads
All listed here
Weight of the pipe
Weight of the back fill

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