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:
C, A, B
The question asks for the correct sequence of processes involved in particle removal from largest to smallest in wastewater treatment. Let's examine each process involved:
- Screening (C): This is the first step in the wastewater treatment process, where large particles such as sticks, rags, and other large debris are removed. This process involves the use of screens which can filter out relatively large solid materials.
- Sedimentation (A): After screening, smaller particles settle out through the process of sedimentation. In a sedimentation tank, gravity causes the heavier particles to settle at the bottom, removing particles smaller than those caught by screening.
- Flocculation (B): This process is designed to remove even smaller particles. During flocculation, small particles are induced to clump together into larger aggregates (flocs) which can then be removed more easily.
Understanding these processes in the context of particle size removal:
- Largest particles are removed first by Screening (C).
- Medium-sized particles are removed during Sedimentation (A).
- Smallest particles are captured through Flocculation (B).
Therefore, the correct order from largest to smallest particle removal is: Screening (C), Sedimentation (A), Flocculation (B).
Thus, the correct answer is the option: C, A, B.
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