GATE CE 2019 Set 1 — Question 51
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Environmental Engineering → Drinking Water Treatment → Filtration
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Question
A deep bed of sand filter (length and width ) is made of uniform particles (diameter , specific gravity , shape factor ) with bed porosity of . The bed has to be backwashed at a flow rate of . During backwashing, if the terminal settling velocity of sand particles is , the expanded bed depth (in , round off to 2 decimal places) is ________
Correct answer
1.15 to 1.25
Solution
1.Calculate backwash velocity ():
2.Calculate expanded bed porosity () using the Richardson-Zaki relationship . For sand, is typically used:
3.Calculate expanded bed depth ():
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