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Waste Water Engineering

Waste Water Engineering
A manhole is generally provided at each

Junction
All of these
Change of gradient
Bend

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

One minute of detention period is kept
All of these
Depth of 0.9 m to 1.20 m is kept
Flow velocity 0.15 m to 0.3 m/sec is kept

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Carbondioxide
Ammonia
Methane
Carbon monoxide

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
None of these
Potassium permanganate

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Waste Water Engineering
In case of Imhoff tanks,

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

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

6 hours
2 hours
8 hours
4 hours

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