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Waste Water Engineering

Waste Water Engineering
No treatment of the sewage is given if dilution factor is

More than 500
Between 200 to 300
Less than 150
Between 150 to 200

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

None of these
Acid regression
Alkaline fermentation
Acid fermentation

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

5 ppm
3 ppm
4 ppm
10 ppm

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

None of these
Free ammonia
Nitrates
Nitrites

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day

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

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

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