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Waste Water Engineering

Waste Water Engineering
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

Is doubled
Is only provided
Is trebled
Is not enough

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water
Unexpected increase in the population
All of these

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Waste Water Engineering
The sewage is pumped up

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

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Waste Water Engineering
The screens are fixed

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

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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

0.12 cumec
0.20 cumec
0.15 cumec
0.10 cumec

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Waste Water Engineering
Primary treatment of sewage consists of removal of

Oil and grease
Floating materials
Large suspended organic solids
Sand and girt

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