Question
Download Solution PDFWhich of the following statements is INCORRECT?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Evaluating the Statements:
Statement 1: In plain sedimentation tanks, the removal of particles is independent of the depth of the sedimentation tank.
From the provided image, it is clear that:
- The settling velocity of the particle is given by \(\frac{D}{L} \times \frac{Q}{BD} = \frac{Q}{LB}\).
- This implies that particles with a settling velocity greater than the overflow rate \(\frac{Q}{LB}\) will settle in the sedimentation basin.
- It states: "Settling efficiency is independent of depth, as per the theory."
Therefore, this statement is correct.
Statement 2: Filters purify water through the following four different processes: mechanical straining, flocculation and sedimentation, biological metabolism and electrolyte charges charging.
- This statement is correct. Filters utilize these processes for water purification.
Statement 3: Flocculation is a chemical technique that is directed towards the destabilization of charged particles and the coagulation promotes the agglomeration of stabilized particles.
- This statement is incorrect. The correct relationship is:
- Coagulation is the process of destabilizing charged particles.
- Flocculation involves the agglomeration of these destabilized particles into larger clumps.
Statement 4: Activated carbon is a de-chlorinating agent.
- This statement is correct. Activated carbon is used to remove chlorine from water.
Last updated on May 28, 2025
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