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Waste Water Engineering

Waste Water Engineering
The drop man holes are generally provided in sewers for

Large town ships
Cities in plains
Hilly town ships
Industrial areas

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

Skimming
Filtration
Screening
None of these

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Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.9 to 1.20 m
0.7 to 0.9 m
0.5 to 0.7 m
0.4 to 0.5 m

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Maximum horizontal flow velocity is limited to 0.3 m/minute
Width of the tank is normally kept about 6 m
Length of the tank is normally kept 4 to 5 times the width
All listed here

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Waste Water Engineering
The rate of accumulation of sludge per person per year, is

15 litres
25 litres
10 litres
20 litres

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

150 mg/l
50 mg/l
100 mg/l
250 mg/l

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