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Waste Water Engineering

Waste Water Engineering
Primary treatment of sewage consists of removal of

Sand and girt
Large suspended organic solids
Oil and grease
Floating materials

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

Oxygen
Hydrogen
Nitrogen
Carbon dioxide

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Waste Water Engineering
The intensity of rain is expressed in

cm/hour
cm/day
None of these
cm/minute

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

100 mg/l
400 mg/l
300 mg/l
200 mg/l

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 3H3p/2 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5
pt = 2H3p/3 Z5

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Waste Water Engineering
The temperature affects the

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

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