GATE CE 2020 Set 1 — Question 62
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Environmental Engineering → Wastewater Treatment Processes → Primary Sedimentation
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Question
Surface Overflow Rate (SOR) of a primary settling tank (discrete settling) is . Kinematic viscosity of water in the tank is . Specific gravity of the settling particles is . Acceleration due to gravity is . The minimum diameter (in , round off to one decimal place) of the particles that will be removed with efficiency in the tank, is ________.
Correct answer
14 to 15
Solution
1.Convert Surface Overflow Rate (SOR) to m/s:
2.Calculate the required settling velocity () for efficiency:
3.Use Stokes' Law to find the diameter ():
Given , , and :Rounding to one decimal place, the diameter is .Continue learning with Success Tracker
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