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

1. Cyclic treatment
2. Primary treatment
3. Activated sludge treatment
4. Tertiary treatment

Correct answer: Activated sludge treatment

Solution

Activated sludge treatment recycles a portion of the microbial-rich sludge back to the start so the decomposer population stays high and breaks down organic matter efficiently. This recycling of activated sludge is the defining feature of the process.

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