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Waste Water Engineering

Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Oxygen
Carbon dioxide
Hydrogen
Nitrogen

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Waste Water Engineering
For sewers, inverted siphon is provided for

Two pipes
Four pipes
One pipe
Three pipes

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D3/2 = 4 b3/2
D2/3 = 4 b2/3
D3/8 = 4 b3/8
D8/3 = 4 b8/3

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5

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

1
2 to 3
5 to 10
3 to 5

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

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

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