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Waste Water Engineering

Waste Water Engineering
Fresh sewage is generally

Highly decomposed
Acidic
A source of objectionable odour
Alkaline

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Waste Water Engineering
A circular sewer section is preferred to because

It provides maximum area for a given perimeter
It provides maximum hydraulic mean depth
It is cheaper in construction
All listed here

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

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

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

80 to 90%
30 to 40%
40 to 60%
60 to 80%

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 120
None of these
1 in 60
1 in 100

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrates
Free ammonia
None of these
Nitrites

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