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Waste Water Engineering

Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.013
0.012
0.01
0.011

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05552 cumec
0.0556 cumec
0.05554 cumec
0.05556 cumec

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Waste Water Engineering
Dried sewage after treatment is used as

Chemical for lowering B.O.D.
Fertilizer
Base material for paints
Building material

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Waste Water Engineering
The minimum diameter of a sewer is kept

25 cm
10 cm
15 cm
20 cm

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Sulphuric acid
Hydrochloric acid
Citric acid
Nitric acid

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Waste Water Engineering
Aerobic activity is maximum

At sewer pipes
In sewer treatment plants
In freshly produced sewage
None of these

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