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Waste Water Engineering

Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

15°C
0°C
20°C
25°C

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Waste Water Engineering
In sewers the highest non-scouring velocity is achieved in

Stone ware sewers
Cast iron sewers
Glazed bricks sewers
Cement concrete sewers

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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

225 ppm
200 ppm
250 ppm
None of these

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

43832
43833
43894
43834

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

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

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/1
D/4
D/2
D/3

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