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Waste Water Engineering

Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

4
3
1.5
2

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

Ammonia
Carbon dioxide
All listed here
Hydrogen

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Initial demand
Carbonaceous demand
All of these
First stage demand

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Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

150 m to 300 m
25 to 50 m
50 m to 100 m
100 m to 150 m

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Waste Water Engineering
For house drainage minimum gradient is

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

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.12 cumec
0.15 cumec
0.20 cumec
0.10 cumec

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