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How the performance of the rapid sand filter can be improved?

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in Environmental Engineering by (81.4k points)
How the performance of the rapid sand filter can be improved?

(a) Replacing the top 15 cm layer of sand with Anthracite

(b) Replacing the bottom15 cm layer of sand with Anthracite

(c) Increasing the thickness of a layer of sand

(d) Replacing 15 cm layer of Anthracite with sand

I have been asked this question in exam.

My question is from Dual Media and Mixed Media Filter in division Filtration of Environmental Engineering

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Correct answer is (a) Replacing the top 15 cm layer of sand with Anthracite

Easiest explanation: The performance of rapid sand filter can be improved by capping sand filters with coal where the top 15 cm layer of sand is replaced with Anthracite.

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