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Waste Water Engineering

Waste Water Engineering
Dried sewage after treatment is used as

Base material for paints
Fertilizer
Chemical for lowering B.O.D.
Building material

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

A breaker
An Imhoff cone
A test tube
A jar

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Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 15
1 in 20
1 in 5
1 in 10

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Waste Water Engineering
The sewer which received discharge from two or more main sewers, is known as

An outfall sewer
A trunk sewer
A main sewer
An intercepting sewer

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

50 ppm
100 ppm
150 ppm
200 ppm

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Waste Water Engineering
During preliminary treatment of a sewage

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

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