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Waste Water Engineering

Waste Water Engineering
Dried sewage after treatment is used as

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

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Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

25 to 50 m
150 m to 300 m
100 m to 150 m
50 m to 100 m

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Waste Water Engineering
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in

Manning’s formula
Bazin’s formula
Chezy’s formula
Kutter’s formula

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Waste Water Engineering
Ventilating shafts are provided to a sewer line at every

300 m
200 m
150 m
100 m

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25
2.5
2.55
2.65

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Phenol-di -sulphuric acid and potassium hydroxide
Potassium permanganate
Sulphuric acid and napthamine
None of these

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