GATE CE 2018 Set 2 — Question 61
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Environmental Engineering → Drinking Water Treatment → Filtration
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Question
At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are and , respectively. Backwashing is done for per day. The maturation, which occurs initially as the filter is put back into service after cleaning, takes . It is proposed to recover the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be ______
Correct answer
7.75 to 7.95
Solution
Let be the area of one filter.
Total time in a day = .
Water produced = Rate Area Time fraction
Total time in a day = .
1.Current Water Production:
Effective filtration time = .Water produced = Rate Area Time fraction
2.Water Wasted:
- During backwashing:
- During maturation:
3.Percentage Increase:
Rounding to two decimal places, we get .Continue learning with Success Tracker
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