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Waste Water Engineering

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
0.1
0.05

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

All listed here
Sedimentation
Oxidation
Screening

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

Cities in plains
Large town ships
Industrial areas
Hilly town ships

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Waste Water Engineering
The design period in years for pumping plants, is

3 to 5
1
5 to 10
2 to 3

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Waste Water Engineering
The average temperature of sewage in India, is

25°C
15°C
10°C
20°C

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

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
Maximum horizontal flow velocity is limited to 0.3 m/minute

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