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Waste Water Engineering

Waste Water Engineering
No treatment of the sewage is given if dilution factor is

More than 500
Between 150 to 200
Less than 150
Between 200 to 300

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Depth of 0.9 m to 1.20 m is kept
All of these
Flow velocity 0.15 m to 0.3 m/sec is kept
One minute of detention period is kept

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Waste Water Engineering
Antisyphonage pipe is fitted

At the beginning of sewer line
On manholes
With a W.'trap
At the end of septic tanks

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Waste Water Engineering
The pH value of fresh sewage is usually

Less than 7
Equal to zero
Equal to 7
More than 7

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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

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

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
1.5
3
2.5

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