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Waste Water Engineering

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

1.065
1.095
1.075
1.085

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

2 days
7 days
12 days
14 days

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Waste Water Engineering
Disposal to sewage in large cities, is done in

Dilution
Irrigation
Oxidation
Purification

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

413.5 cm/sec
313.5 cm/sec
213.5 cm/sec
500 cm/sec

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

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

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Waste Water Engineering
Lead acetate test in sewer manhole is done to test the presence of

Diesel vapours
Methane gas
Hydrogen sulphide
Carbondioxide gas

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