Which one of the following is the most important parameter for the removal of discrete particles in the design of continuous flow rectangular sedimentation tank?

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SSC JE CE Previous Year Paper 3 (Held On: 29 Jan 2018 Morning)
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  1. Depth of tank
  2. Length of tank
  3. Surface overflow rate
  4. Temperature of water to be treated

Answer (Detailed Solution Below)

Option 3 : Surface overflow rate
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Explanation:

The most important parameter for the removal of discrete particles in the design of continuous flow rectangular sedimentation tank is:

Surface overflow rate because

  • It is the flow velocity at which the tank is designed to operate.
  • The efficiency of the sedimentation tank increases if the overflow rate reduces (more time available to particles for settle).Vs = Q/BL
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