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Waste Water Engineering

Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Bronchitis
Skin cancer
Lung cancer
Heart disorder

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.0556 cumec
0.05554 cumec
0.05556 cumec
0.05552 cumec

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Waste Water Engineering
The sewage is pumped up

From flat areas
All listed here
From low lying areas
From basements

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Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Circular shaped
Egg shaped
Horse shoe shaped
Parabolic shaped

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

One minute of detention period is kept
Flow velocity 0.15 m to 0.3 m/sec is kept
All of these
Depth of 0.9 m to 1.20 m is kept

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Two sewer lines intersect
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer

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