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Waste Water Engineering

Waste Water Engineering
Dried sewage after treatment is used as

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

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Dissolved oxygen in water
All listed here
Temperature
Hydrology

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Waste Water Engineering
The quantity of liquid waste which flows in sewers during the period of rainfall, is known

None of these
Sanitary sewage
Industrial waste
Storm sewage

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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

0.5
0.1
0.25
0.05

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Width of the tank is normally kept about 6 m
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute
All listed here

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Waste Water Engineering
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

216 cu.m
208 cu.m
212 cu.m
204 cu.m

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