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Waste Water Engineering

Waste Water Engineering
The small sewers are cleaned by

Wooden pills
None of these
Cane rodding
Flushing

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

30 minutes
1 hour and 30 minutes
2 hours
1 hour

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Horse shoe shaped
Rectangular
Circular
Egg shaped

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

0°C
15°C
25°C
20°C

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Waste Water Engineering
The screens are fixed

At an angle 30° to 60° to the direction of flow
Perpendicular to the direction of flow
None of these
Parallel to the direction of flow

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Cleaner water
Degradation
Recovery
Active decomposition

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