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Waste Water Engineering

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

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

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Waste Water Engineering
The sewer which received discharge from two or more main sewers, is known as

An intercepting sewer
A main sewer
An outfall sewer
A trunk sewer

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

7.5 kg to 10 kg
5 kg to 7.5 kg
0.5 to 1.0 kg
1 kg to 2.0 kg

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Waste Water Engineering
Sewer manholes are generally provided at

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

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d² (0.011d + 0.785H)/Q
d (0.022d + 0.085H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q

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Waste Water Engineering
In a trickling filter

Biological action is used
Both A and B
Neither A nor B
Filtration process is used

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