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Waste Water Engineering

Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 60
1 in 80
1 in 400

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Bazin
William-Hazen
Kutter
Crimp and Bruges

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Waste Water Engineering
Dried sewage after treatment is used as

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

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Waste Water Engineering
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

Is doubled
Is trebled
Is not enough
Is only provided

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day

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Waste Water Engineering
The following is the physical characteristic of sewage

All listed here
Colour
Odour
Turbidity

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