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Waste Water Engineering

Waste Water Engineering
The factor responsible for purification of sewage in river is

Hydrology
All listed here
Dissolved oxygen in water
Temperature

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Twice the average demand
Four times the average demand
Average demand
Thrice the average demand

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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

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

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Waste Water Engineering
Which one of the following part of human body withstands minimum radiation?

Kidneys
Eyes
Thyroid
Ovaries/testis

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Waste Water Engineering
No treatment of the sewage is given if dilution factor is

Between 200 to 300
Between 150 to 200
More than 500
Less than 150

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.5
0.25
0.05
0.1

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