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Waste Water Engineering

Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Seas
None of these
Lakes
Rivers

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Waste Water Engineering
The most efficient cross section of sewers in a separate sewerage system is

Circular
Parabolic
New egged
Rectangular

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

None of these
H₂SO₄
HCl
HNO₃

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

43832
43834
43894
43833

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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 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

0.20 cumec
0.12 cumec
0.10 cumec
0.15 cumec

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