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Waste Water Engineering

Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

413.5 cm/sec
500 cm/sec
213.5 cm/sec
313.5 cm/sec

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

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

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Rivers
Lakes
Seas
None of these

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

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

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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

0.05
0.25
0.1
0.5

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Waste Water Engineering
For sewers, inverted siphon is provided for

Two pipes
One pipe
Four pipes
Three pipes

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