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Waste Water Engineering

Waste Water Engineering
The flow velocity in detritus tanks is

1.25 m/sec
0.05 m/sec
0.09 m/sec
None of these

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Waste Water Engineering
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

None of these
Sludge sedimentation tanks
Imhoff tanks
Trickling filters

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Waste Water Engineering
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

150 cm
110 cm
120 cm
100 cm

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

2 hours
8 hours
6 hours
4 hours

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

43894
43832
43833
43834

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

300 mg/l
400 mg/l
100 mg/l
200 mg/l

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