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Waste Water Engineering

Waste Water Engineering
The underground sewers are more subjected to

Compressive force
Shearing force
Tensile force
Bending force

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Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Aluminoid nitrogen
Free ammonia
Nitrites
Nitrates

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Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

10
0.25
2
5

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.60 m/sec
0.50 m/sec
0.75 m/sec
0.70 m/sec

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Waste Water Engineering
In sewers the gas generally found, is

All listed here
Carbon dioxide (CO2)
Methane (CH4)
Hydrogen sulphide (H2S)

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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

0.1
0.25
0.05
0.5

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