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Waste Water Engineering

Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.013
0.012
0.011
0.01

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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
None of these
225 ppm
200 ppm

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

3
2
2.5
1.5

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Waste Water Engineering
Which one of the following resists hydrogen sulphide corrosion?

R.C.C.
Asbestos cement
Glazed ware
Glazed stone wares

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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

120 cm
150 cm
110 cm
100 cm

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Waste Water Engineering
In detritus tanks,

Flow velocity is kept 0.09 m/sec
All listed here
Organic and inorganic materials are separated
Detention period is kept 3 to 4 minutes

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