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What is the specific gravity of Anthracite used in a dual media filter?

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in Environmental Engineering by (81.4k points)
What is the specific gravity of Anthracite used in a dual media filter?

(a) 1

(b) 1.4

(c) 2.4

(d) 4.2

The question was asked in an internship interview.

My doubt is from Dual Media and Mixed Media Filter in portion Filtration of Environmental Engineering

1 Answer

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Correct option is (b) 1.4

Easy explanation: The specific gravity of Anthracite is 1.4 and due to this, the beds of it can be expanded at a same backwash rate as sand bed when the size of anthracite grains is twice of sand grains.

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