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Waste Water Engineering

Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

None of these
Nitrites
Free ammonia
Nitrates

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

2.5 to 3.0 m/sec
3.5 to 4.5 m/sec
3.0 to 4.0 m/sec
4.5 to 5.5 m/sec

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

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

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Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 60
1 in 400
1 in 80

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Waste Water Engineering
Sewer manholes are generally provided at

The change of direction
All of these
The junctions of sewers
The change of gradient

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day

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