NEET 2017 · BiologyPrevious Year Question
Which of the following in sewage treatment removes suspended solids?
Answer: (C) Primary treatment. Answer: (c) Primary treatment Solution: Primary treatment is a physical process that removes suspended solids from sewage through sequential filtration and sedimentation (floating debris first, then grit).
- A.Tertiary treatment
- B.Secondary treatment
- C.Primary treatment✓
- D.Sludge treatment
Correct Answer
(C) Primary treatment
Solution & Explanation
Answer: (c) Primary treatment Solution: Primary treatment is a physical process that removes suspended solids from sewage through sequential filtration and sedimentation (floating debris first, then grit). Secondary (biological) treatment uses aerobic microbes to reduce BOD, while tertiary and sludge treatment occur later, so they do not perform the initial removal of suspended solids. NCERT Reference: Ch 8, p.154, line 7 — "particles – large and small – from the sewage"
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