The GATE Grind

GATE 2024 AR — Planning – Question 20

Infrastructure, Services and Utilities · Water treatment · 1 mark · Multiple select

Which sequences occur in conventional water treatment?

  1. Coagulation → Flocculation → Sedimentation
  2. Sedimentation → Filtration → Disinfection
  3. Sedimentation → Flocculation → Coagulation
  4. Disinfection → Filtration → Flocculation

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Correct answer: (A) Coagulation → Flocculation → Sedimentation; (B) Sedimentation → Filtration → Disinfection

Explanation

Coagulation destabilises particles, flocculation grows settleable flocs, and sedimentation removes them. Filtration follows clarification and disinfection follows filtration. Thus A, B represent correct successive portions of the treatment train; C, D reverse key dependencies.

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