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Waste Water Engineering

Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

100
1000
10000
5000

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D2/3 = 4 b2/3
D3/8 = 4 b3/8
D8/3 = 4 b8/3
D3/2 = 4 b3/2

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/2
D/4
D/1
D/3

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Waste Water Engineering
Removal of oil and grease from sewage, is known

None of these
Skimming
Filtration
Screening

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Waste Water Engineering
The asbestos cement sewers are

Light in weight
Not structurally strong to bear large compressive stress
Susceptible to corrosion by sulphuric acid
All of these

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
None of these
Potassium permanganate

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