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Waste Water Engineering

Waste Water Engineering
In sewage, the solids in mg per litre is

100 to 500
500 to 1000
1000 to 1500
1500 to 2000

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Invert level of a branch sewer is more than 60 cm that of the main sewer
Two sewer lines intersect
Sewer line runs along a main road
Ordinary manhole cannot be built

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Waste Water Engineering
The temperature affects the

Biological activity of bacteria in sewage
Solubility of gases in sewage
Viscosity of sewage
All of these

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

Aluminoid nitrogen
Nitrates
Free ammonia
Nitrites

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

18 cm
12 cm
15 cm
10 cm

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Waste Water Engineering
In case of Imhoff tanks,

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

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