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Waste Water Engineering

Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

All listed here
Screening
Oxidation
Sedimentation

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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

110 cm
150 cm
120 cm
100 cm

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Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.45 m
2.30 m
2.40 m
2.50 m

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
The flow of sewage to fill the tank
A particle to travel from top surface to bottom sludge zone
None of these

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

18 cm
12 cm
15 cm
10 cm

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

30 days
60 days
20 days
10 days

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