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Waste Water Engineering

Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

200 ppm
225 ppm
None of these
250 ppm

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Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 15
1 in 10
1 in 5
1 in 20

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Waste Water Engineering
The recommended detention period for grit chambers is

1 minute
3 minutes
5 minutes
2 minutes

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Waste Water Engineering
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

Branch sewer
Lateral sewer
House sewer
Sewer outfall

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

Hydrology
Temperature
Dissolved oxygen in water
All listed here

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Oxidation
Screening
Sedimentation
All listed here

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