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Waste Water Engineering

Waste Water Engineering
Water content of sewage is about

0.99
0.9
0.95
0.999

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Waste Water Engineering
Maximum permissible velocity 1.5 m/sec, is adopted in drains

Lined with stones
Both A. and B.
Neither A. nor B.
With beds of rocks and gravels

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D3/8 = 4 b3/8
D8/3 = 4 b8/3
D3/2 = 4 b3/2
D2/3 = 4 b2/3

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Waste Water Engineering
During preliminary treatment of a sewage

Oil and grease are removed from skimming tanks
Girt and sand are removed by girt chambers
All listed here
Floating materials are removed by screening

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected large scale infiltration of stream water
Under estimates of maximum and average flows
Unexpected increase in the population
All of these

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Waste Water Engineering
The underground sewers are more subjected to

Tensile force
Bending force
Compressive force
Shearing force

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