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Waste Water Engineering

Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

4
3
1.5
2

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Waste Water Engineering
In sewers the effect of scouring is more on

Bottom side
Horizontal side
All sides
Top side

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Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Carbon dioxide
Hydrogen
Nitrogen
Oxygen

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

None of these
Free ammonia
Nitrates
Nitrites

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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

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

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Waste Water Engineering
The standard B.O.D. of water is taken for

3 days
1 day
5 days
2 days

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