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Waste Water Engineering

Waste Water Engineering
The minimum recommended diameter of sewers, is

10 cm
5 cm
15 cm
20 cm

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

4 hours
2 hours
8 hours
6 hours

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

25,000 to 35,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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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

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

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Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Sulphur-dioxide
Nitrogen
Carbondioxide
Oxygen

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Waste Water Engineering
Dry weather flow is:

Average daily rate of flow
Average monthly rate of flow
Water supply allowance per capita
Average annual rate of flow

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