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Waste Water Engineering

Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

None of these
Anaerobic bacteria
Both types of bacterias
Aerobic bacteria

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Waste Water Engineering
Flocculated particles do not change their

Shape
Weight
Size
None of these

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

14 days
2 days
12 days
7 days

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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

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

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Waste Water Engineering
The sewer pipe which carries sewage from a building for immediate disposal is

Intercepting sewer
Main sewer
House sewer
Lateral sewer

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Waste Water Engineering
The gas evolved in sewers is

Carbondioxide
Hydrogen sulphide
All of these
Methane

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