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Waste Water Engineering

Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Rivers
Seas
Lakes
None of these

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Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

140 cm
120 cm
100 cm
160 cm

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

1 hour and 30 minutes
1 hour
2 hours
30 minutes

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

100 m
50 m
300 m
200 m

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Less than 0.1 mm
Less than 0.05 mm
Greater than 0.1 mm

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Waste Water Engineering
Flocculated particles do not change their

None of these
Size
Shape
Weight

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