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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

All listed here
Ammonia
Carbon dioxide
Hydrogen

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Waste Water Engineering
With self cleansing velocity in sewers

Scouring occurs at bottom
Neither silting nor scouring occurs at bottom
Silting occurs at bottom
Both silting and scouring occur at bottom

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

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

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Waste Water Engineering
For house drainage minimum gradient is

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

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

1.5
3
4
2

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