GATE CE 2024 Set 2 — Question 60
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Environmental Engineering → Wastewater Treatment Processes → Primary Sedimentation
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Question
A circular settling tank is to be designed for primary treatment of sewage at a flow rate of 10 million liters/day. Assume a detention period of 2.0 hours and surface loading rate of 40000 liters/m/day. The height (in meters) of the water column in the tank is _______________ (rounded off to 2 decimal places).
Correct answer
3.25 to 3.4
Solution
1.Convert flow rate to m/day:
liters/day = 10,000 m/day2.Calculate the volume of the tank using detention time ():
hours = daym
3.Calculate the surface area () using the Surface Loading Rate (SLR):
liters/m/day = 40 m/m/daym
4.Calculate the height () of the water column:
mRounding to two decimal places, the height is 3.33 m.Continue learning with Success Tracker
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