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Waste Water Engineering

Waste Water Engineering
The flow velocity in detritus tanks is

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

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

500 litres/km/cm
2000 litres/km/cm
1000 litres/km/cm
1500 litres/km/cm

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Both (A) and (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Neither (A) nor (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

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Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

250 ppm
225 ppm
200 ppm
None of these

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

2 hours
30 minutes
1 hour and 30 minutes
1 hour

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

7 days
2 days
12 days
14 days

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