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Waste Water Engineering

Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Nitrogen
Hydrogen
Oxygen
Carbon dioxide

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Waste Water Engineering
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

1.2 m
1.5 m
0.9 cm
> 1.5 m

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.94 D
D’ = 0.84 D
D’ = 0.74 D
D’ = 0.64 D

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Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

B = 0.5 d
B = 0.2 d
d = 0.2 B
d = 0.5 B

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
All listed here
Hydrology
Dissolved oxygen in water

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Waste Water Engineering
Aerobic bacterias

Oxidise organic matter in sewage
Consume organic matter as their food
Flourish in the presence of free oxygen
All of these

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