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Waste Water Engineering

Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Oxygen
Carbon dioxide
Hydrogen
Nitrogen

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Waste Water Engineering
Which one of the following gases is most significant as air pollutant?

Nitrogen
Oxygen
Sulphur-dioxide
Carbondioxide

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Waste Water Engineering
Dried sewage after treatment is used as

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

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Waste Water Engineering
The temperature affects the

All of these
Solubility of gases in sewage
Viscosity of sewage
Biological activity of bacteria in sewage

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Waste Water Engineering
Rate of flow of sewage is generally assumed

More than the rate of water supply
Equal to the rate of water supply
Less than the rate of water supply
At 150 litres per capita

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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 not enough
Is only provided
Is trebled
Is doubled

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