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Waste Water Engineering

Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Active decomposition
Degradation
Recovery
Cleaner water

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

None of these
A particle to travel along its length
The flow of sewage to fill the tank
A particle to travel from top surface to bottom sludge zone

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Kutter
Manning
Bazin
Chezy

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Waste Water Engineering
The algae dies out in the zone of

Recovery
Active decomposition
Degradation
Cleaner water

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Waste Water Engineering
Oxidation process results in the formation of

Sulphates
Nitrates
All of these
Carbon dioxide

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Waste Water Engineering
Sewer manholes are generally provided at

The change of direction
The junctions of sewers
The change of gradient
All of these

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