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Waste Water Engineering

Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Chlorinated coppers
Alum
Ferric chloride
Ferric sulphate

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Waste Water Engineering
Imhoff cone is used to measure

Total organic solids
Total solids
Settleable solids
Total in organic solids

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Carbonaceous demand
Initial demand
All of these
First stage demand

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Waste Water Engineering
Rate of flow of sewage is generally assumed

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

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Waste Water Engineering
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is

10 cm
15 cm
12 cm
18 cm

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected large scale infiltration of stream water
All of these
Under estimates of maximum and average flows
Unexpected increase in the population

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