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Waste Water Engineering

Waste Water Engineering
If the pH value of sewage is 7

It is alkaline
It is acidic
It is neutral
None of these

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

200 mg/l
400 mg/l
100 mg/l
300 mg/l

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

10 ppm
3 ppm
5 ppm
4 ppm

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

2000 litres/km/cm
1000 litres/km/cm
1500 litres/km/cm
500 litres/km/cm

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Boiling
Adding sulphuric acid
Adding potassium permanganate
Phenol-di-sulphuric acid

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Waste Water Engineering
In detritus tanks,

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

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