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Which of the following is called as a conventional trickling filter?

(a) Rapid sand filter

(b) Slow sand filter

(c) High rate trickling filter

(d) Low rate trickling filter

I had been asked this question in an international level competition.

This key question is from Conventional Trickling Filter in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Right option is (d) Low rate trickling filter

Explanation: Low rate trickling filter is called as a conventional trickling filter. It is also called a standard rate and percolating filter.

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