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Waste Water Engineering

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

3
1.5
2
2.5

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

15 days
90 days
30 days
60 days

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

3
2
1.5
4

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Waste Water Engineering
In detritus tanks,

All listed here
Flow velocity is kept 0.09 m/sec
Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated

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

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

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
All listed here
Hydrology
Dissolved oxygen in water

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