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Waste Water Engineering

Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

12 days
7 days
2 days
14 days

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Waste Water Engineering
The gradient of sewers depends upon

Discharge
Velocity of flow
Diameter of the sewer
All listed here

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Waste Water Engineering
Facultative bacteria survive in

Neither A nor B
The presence of oxygen
Both cases A and B
The absence of oxygen

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.10 cumec
0.12 cumec
0.15 cumec
0.20 cumec

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Waste Water Engineering
Imhoff cone is used to measure

Total organic solids
Settleable solids
Total solids
Total in organic solids

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

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

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