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Waste Water Engineering

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

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

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

None of these
Seas
Rivers
Lakes

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Waste Water Engineering
For sewers, inverted siphon is provided for

Four pipes
Two pipes
Three pipes
One pipe

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d² (0.011d + 0.785H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q
d (0.022d + 0.085H)/Q

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5.5 m
7 m
6.5 m
5 m

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

3.5 years
3 years
5 years
4 years

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