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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

Carbon dioxide
Hydrogen
All listed here
Ammonia

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Low estimates of the average and maximum flows
Large scale infiltration of storm water
Unexpected increase in population
All listed here

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Waste Water Engineering
In sewage, the solids in mg per litre is

1000 to 1500
100 to 500
500 to 1000
1500 to 2000

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

225 mm dia
100 mm dia
All of these
150 mm dia

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

100 mg/l
250 mg/l
150 mg/l
50 mg/l

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
200 ppm
100 ppm
50 ppm

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