A sewage treatment process in which a portion of the decomposer bacteria present in the waste recycled into the beginning of the process is called as

Activated sludge treatment

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Primary treatment

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Tertiary treatment

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Cyclic treatment

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Solution

The correct option is A Activated sludge treatment
Activated sludge refers to the flocs of microorganisms which are used in the process to break down organic matter into carbon dioxide, water, and other inorganic compounds. There are microbes which grow in the water forming mass or flocs and help in the clearing of the water. These flocs are used in the next round of treatment plants for efficient removal of wastes.
Thus, the correct answer is option A.

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