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Q: Which of the following statements is INCORRECT?
  • A. Activated carbon is a de-chlorinating agent
  • B. Flocculation is a chemical technique that is directed towards the destabilisation of charged particles and the coagulation promotes the agglomeration of stabilised particles
  • C. In plain sedimentation tanks, the removal of particles is independent of the depth of the sedimentation tank
  • D. Filters purify water through the following four different processes: mechanical straining, flocculation and sedimentation, biological metabolism and electrolyte charges charging.
Correct Answer: Option B - Activated carbon is probably the most important method for the control of taste and odour. • Flocculent particles can be changed by adding suitable chemicals known as coagulants. These particles when come in close proximity of each other forms a heavier flock that settles easily under the action of gravity and is quite effective in settlement of fine colloidal particles. The process is known as sedimentation aided with coagulation. • In plaint sedimentation tanks the removal of particles is independent of the depth of sedimentation tank.
B. Activated carbon is probably the most important method for the control of taste and odour. • Flocculent particles can be changed by adding suitable chemicals known as coagulants. These particles when come in close proximity of each other forms a heavier flock that settles easily under the action of gravity and is quite effective in settlement of fine colloidal particles. The process is known as sedimentation aided with coagulation. • In plaint sedimentation tanks the removal of particles is independent of the depth of sedimentation tank.

Explanations:

Activated carbon is probably the most important method for the control of taste and odour. • Flocculent particles can be changed by adding suitable chemicals known as coagulants. These particles when come in close proximity of each other forms a heavier flock that settles easily under the action of gravity and is quite effective in settlement of fine colloidal particles. The process is known as sedimentation aided with coagulation. • In plaint sedimentation tanks the removal of particles is independent of the depth of sedimentation tank.