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Waste Water Engineering

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

Nitrites
Aluminoid nitrogen
Nitrates
Free ammonia

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Waste Water Engineering
The asbestos cement sewers are

All of these
Not structurally strong to bear large compressive stress
Susceptible to corrosion by sulphuric acid
Light in weight

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Waste Water Engineering
For sewers, inverted siphon is provided for

Two pipes
Three pipes
Four pipes
One pipe

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

20°C
15°C
0°C
25°C

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

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Waste Water Engineering
A rain sanitary sewer is constructed to carry

Sanitary sewage
Surface water
Ground water
Storm sewage

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