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Waste Water Engineering

Waste Water Engineering
A rain sanitary sewer is constructed to carry

Surface water
Sanitary sewage
Storm sewage
Ground water

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Waste Water Engineering
The factor responsible for purification of sewage in river is

All listed here
Dissolved oxygen in water
Temperature
Hydrology

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

30 days
60 days
10 days
20 days

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

100 mg/l
200 mg/l
400 mg/l
300 mg/l

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

30 minutes
1 hour and 30 minutes
1 hour
2 hours

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Waste Water Engineering
The liquid wastes from kitchens, bath rooms and wash basins, is not called

Sewage
Sullage
Liquid waste
None of these

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