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Which material is provided for the up flow bed in dual media bi-flow filter?

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in Environmental Engineering by (81.4k points)
Which material is provided for the up flow bed in dual media bi-flow filter?

(a) Anthracite

(b) Sand

(c) Rice husk

(d) Graphite

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Enquiry is from Various Other Filters topic in portion Filtration of Environmental Engineering

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The correct choice is (b) Sand

Explanation: Sand is provided for the up-flow bed in dual media bi-flow filter. The quality of effluent obtained from up-flow bed in dual media bi-flow filter is inferior than that of  the mixed media filter.

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