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Waste Water Engineering

Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Sulphur-dioxide
Nitrogen
Oxygen
Carbondioxide

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

120 cm
100 cm
150 cm
110 cm

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Waste Water Engineering
The algae dies out in the zone of

Recovery
Cleaner water
Degradation
Active decomposition

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Waste Water Engineering
In case of Imhoff tanks,

All of these
Detention period is 2 hours
The shape is rectangular
The velocity of flow is restricted to 0.30 m/minute

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

16 m
24 m
20 m
30 m

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

8 to 16 hours
24 to 36 hours
4 to 8 hours
16 to 24 hours

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