Which of the following statements regarding primary treatment of sewage water are correct: A. It is a physical treatment B. It is based on formation of flocs to trap the particulate matter from the sewage C. It removes large and small particles through filtration and sedimentation. D. It removes floating debris by filtration and grit by sedimentation Choose the correct answer from the options given below:
This question was previously asked in
Shift 12/06/2023 8:30 AM - 10:30 AM
A
A. B and C only
B
B, C and D only
C
A. C and D only
D
A. B and D only
Correct Answer
A. C and D only
Detailed Explanation
Primary treatment basically involve physical removal of particles - large and small - from the sewage through filtration and sedimentation. Initially, floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. All solids that settle form the primary sludge, and the supernatant forms the effluent.
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