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Waste Water Engineering

Waste Water Engineering
The sewer which transports the sewage to the point of treatment, is called

Branch sewer
Out-fall sewer
Main sewer
House sewer

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

75 m
20 m
30 m
45 m

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.05
0.5
0.1
0.25

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Waste Water Engineering
The minimum recommended diameter of sewers, is

10 cm
5 cm
15 cm
20 cm

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
A particle to travel from top surface to bottom sludge zone
None of these
The flow of sewage to fill the tank

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

60 to 80%
40 to 60%
30 to 40%
80 to 90%

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