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Waste Water Engineering

Waste Water Engineering
The pH value of sewage is determined with the help of

None of these
Imhoff Cone
Potentiometer
Turbid meter

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Waste Water Engineering
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

Imhoff tanks
Sludge sedimentation tanks
Trickling filters
None of these

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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
50 ppm
100 ppm

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

75 m
45 m
20 m
30 m

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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

200 ppm
250 ppm
225 ppm
None of these

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Nitrites are formed
Nitrates are formed
Ammonia is formed
Carbondioxide is formed

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