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Waste Water Engineering

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

3 years
3.5 years
4 years
5 years

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Waste Water Engineering
Pathogens (or pathogenic bacterias) in water may cause

Dysentery
All listed here
Cholera
Typhoid

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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
0.20 cumec
0.10 cumec
0.15 cumec

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

Hydrogen
Ammonia
Carbon dioxide
All listed here

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Waste Water Engineering
Discrete or granular particles change their

None of these
Weight
Shape
Size

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

20 m
30 m
16 m
24 m

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