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Waste Water Engineering

Waste Water Engineering
The sewage is pumped up

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

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
1.5
3
2.5

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Waste Water Engineering
With self cleansing velocity in sewers

Both silting and scouring occur at bottom
Silting occurs at bottom
Scouring occurs at bottom
Neither silting nor scouring occurs at bottom

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

100 mg/l
200 mg/l
400 mg/l
300 mg/l

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.35 m/sec
0.40 m/sec
0.30 m/sec
0.45 m/sec

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Waste Water Engineering
The ratio of design discharge to the surface area of a sedimentation tank is called

Surface loading
All of these
Overflow velocity
Overflow rate

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