21. The detention period for oxidation ponds is usually kept as
22. If the sewage contains grease and fatty oils, these are removed in
23. The design discharge for the separate sewer system shall be taken as
24. The design discharge for the combined sewer system shall be taken as
25. The major disadvantage of lime soda process of water softening is that
26. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
27. Which of the following sewers is preferred for combined system of sewage?
28. The settling velocity of a particle in a sedimentation tank increases if
29. Air binding phenomena in rapid sand filters occur due to
30. The chemical most commonly used to increase speed of sedimentation of sewage is
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