What is the correct sequence of processes involved in particle removal from…
2023
What is the correct sequence of processes involved in particle removal from largest to smallest in waste-water treatment?
A. Sedimentation
B. Flocculation
C. Screening
Choose the correct answer from the options given below:
Answer: A. C, A, B — ConceptParticle-removal methods can be ranked by the size class they primarily target. Screening intercepts coarse solids; sedimentation removes settleable…
- A.
C, A, B
- B.
A, B, C
- C.
B, A, C
- D.
A, C, B
Show answer & explanation
Correct answer: A
Concept
Particle-removal methods can be ranked by the size class they primarily target.
Screening intercepts coarse solids; sedimentation removes settleable suspended matter by gravity; flocculation aggregates fine or colloidal particles into larger flocs for later separation.
Application
Screening acts on the largest objects and coarse debris.
Sedimentation acts on smaller suspended particles that are dense enough to settle.
Flocculation addresses the finest and colloidal fraction by gathering it into flocs.
Cross-check
This is a largest-to-smallest particle-size ranking, not a claim that every treatment plant places the unit operations in this exact chronological order.
Therefore the required sequence is Screening, Sedimentation, Flocculation, corresponding to C, A, B.