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Waste Water Engineering

Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Nitrates
Aluminoid nitrogen
Free ammonia
Nitrites

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Waste Water Engineering
Aerobic activity is maximum

In sewer treatment plants
At sewer pipes
In freshly produced sewage
None of these

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Waste Water Engineering
In case of Imhoff tanks,

The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
All of these
The shape is rectangular

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Waste Water Engineering
A drop manhole is provided if

None of these
A lamp is inserted to check obstruction
A sewer drops from a height
A branch sewer joins the main sewer at higher level

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Bio-Chemical Oxygen Demand (B.O.D.)
Dissolved Oxygen (D.O.)
None of these
Chemical Oxygen Demand (C.O.D.)

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

50 m
300 m
200 m
100 m

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