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Waste Water Engineering

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

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

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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
300 mg/l
100 mg/l

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

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

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Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

5
20
15
10

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Waste Water Engineering
In case of Imhoff tanks,

Detention period is 2 hours
All of these
The velocity of flow is restricted to 0.30 m/minute
The shape is rectangular

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Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

3 hours
2 hours
5 hours
4 hours

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