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In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely.

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In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely.

(a) Autotrophic

(b) Heterotrophic

(c) Schmutzdecke

(d) Electrolytic

The question was posed to me during an online interview.

Asked question is from Theory and classification of Filtration in chapter Filtration of Environmental Engineering

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Correct answer is (b) Heterotrophic

The explanation: In Heterotrophic zone, bacteria multiplies in large number, breaks down not only the organic matter but also destroys each other to maintain a balance of life in the filter.

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