GATE CE 2014 Set 2 — Question 56
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Environmental Engineering → Drinking Water Treatment → Sedimentation
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Question
A suspension of sand like particles in water with particles of diameter and below is flowing into a settling tank at . Assume , specific gravity of particles , and kinematic viscosity of water . The minimum surface area (in ) required for this settling tank to remove particles of size and above with 100% efficiency is
Correct answer
31 to 32
Solution
Step 1: Identify the given parameters.
For 100% removal efficiency, the surface overflow rate must be equal to the settling velocity of the smallest particle to be removed.The value lies in the range 31.0 to 32.0.
- Flow rate () =
- Particle diameter () =
- Specific gravity () =
- Kinematic viscosity () =
- Acceleration due to gravity () =
For 100% removal efficiency, the surface overflow rate must be equal to the settling velocity of the smallest particle to be removed.The value lies in the range 31.0 to 32.0.
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