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Waste Water Engineering

Waste Water Engineering
Dried sewage after treatment is used as

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

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

5 kg to 7.5 kg
7.5 kg to 10 kg
1 kg to 2.0 kg
0.5 to 1.0 kg

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Waste Water Engineering
depends upon The Chezy’s constant C in the formula V = C

Shape of the sewer
All listed here
Roughness of sewer surface
Size of the sewer

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Waste Water Engineering
For trunk and out-fall, the type of sewers generally used, is

Parabolic shaped
Standard egg shaped
Horse shoe shaped
Circular shaped

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Waste Water Engineering
The following is the physical characteristic of sewage

All listed here
Colour
Turbidity
Odour

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