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Waste Water Engineering

Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

65 to 70%
70 to 75%
0.85
75 to 80%

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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
0.15 cumec
0.12 cumec
0.20 cumec

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d² (0.011d + 0.785H)/Q
d (0.285d + 0.011H)/Q
d (0.022d + 0.085H)/Q
d (0.785d + 0.011H)/Q

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Waste Water Engineering
The rational formula for peak drainage discharge, was evolved by

Kuichling
Fruhling
All of these
Lloyd David

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

Organic nitrogen and ammonia
Nitrogen and organic nitrogen
All listed here
Ammonia and nitrogen

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Waste Water Engineering
Oxidation process results in the formation of

All of these
Sulphates
Carbon dioxide
Nitrates

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