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Waste Water Engineering

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

Oxygen
Carbondioxide
Sulphur-dioxide
Nitrogen

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05556 cumec
0.0556 cumec
0.05552 cumec
0.05554 cumec

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
1.5
3
2.5

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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Waste Water Engineering
Water content of sewage is about

0.999
0.95
0.9
0.99

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

3 years
4 years
3.5 years
5 years

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