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Waste Water Engineering

Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.085
1.095
1.065
1.075

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Waste Water Engineering
Chlorination of water is done for the removal of

Bacterias
Sediments
Suspended solids
Hardness

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Chemical Oxygen Demand (C.O.D.)
Bio-Chemical Oxygen Demand (B.O.D.)
Dissolved Oxygen (D.O.)
None of these

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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
Maximum horizontal flow velocity is limited to 0.3 m/minute
All listed here

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

25°C
0°C
20°C
15°C

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Waste Water Engineering
The minimum recommended diameter of sewers, is

20 cm
5 cm
15 cm
10 cm

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