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Which of the following is called as contact bed?

(a) Primary clarifier

(b) Secondary clarifier

(c) Contact filter

(d) High rate digester

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This interesting question is from Types of Sewage Filter topic in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Correct option is (c) Contact filter

Easy explanation: Contact filters are water tight tanks that are used for the aerobic treatment of sewage. They are also called as contact bed.

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