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Waste Water Engineering

Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Electrically
Hydraulically
Manually
Mechanically

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

8 to 16 hours
16 to 24 hours
4 to 8 hours
24 to 36 hours

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

1.095
1.085
1.065
1.075

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Ammonia is formed
Nitrates are formed
Carbondioxide is formed
Nitrites are formed

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

3 ppm
4 ppm
5 ppm
10 ppm

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Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Raising low lying areas by dumping
Concreting
Both A and B
Neither A nor B

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