The factor responsible for purification of sewage in river is Hydrology Dissolve

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Question
The factor responsible for purification of sewage in river is
Options
A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. Turbulence
E. All the above.

Correct Answer

All the above.

Waste Water Engineering problems

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3. Pick up the correct statement from the following :
Options
A. The maximum rate of storm run off is called peak drainage discharge
B. Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares
C. The period after which the entire area starts contributing to the run off, is called the time of concentration
D. The time required by water to reach the outlet of a catchment from the most remote point, is called time of concentration
E. All the above.

4. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
Options
A. should be sunk by 20 cm
B. should be kept 20 cm above the adjacent portion
C. should be sunk by 50 cm
D. need not be sunk.

5. Pick up the incorrect statement from the following :
Options
A. Septic tanks are horizontal continuous flow type of sedimentation tanks
B. Septic tanks are generally provided a detention period of 12 to 36 hours
C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
D. Septic tanks are generally classified as tanks which work on the principle of anaerobic decomposition
E. None of these.

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