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Waste Water Engineering

Waste Water Engineering
The sewage treatment in septic tanks is due to

Parasitic decomposition
Aerobic decomposition
Anaerobic decomposition
None of these

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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

0.10 cumec
0.12 cumec
0.20 cumec
0.15 cumec

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43834
43833
43832
43894

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.60 m/sec
0.75 m/sec
0.50 m/sec
0.70 m/sec

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Waste Water Engineering
Flocculated particles do not change their

Size
Weight
None of these
Shape

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Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

30 cm c/c
15 cm c/c
50 cm c/c
22.5 cm c/c

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