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Septic action is produced by the septic tank by __________

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Septic action is produced by the septic tank by __________

(a) Fungi

(b) Virus

(c) Termites

(d) Anaerobic bacteria

I have been asked this question during an online interview.

Origin of the question is Systems of Plumbing topic in portion Plumbing for Buildings of Construction & Building Materials

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The correct answer is (d) Anaerobic bacteria

Explanation: Septic action is produced by the septic tank by anaerobic bacteria. In this, carbohydrates, proteins and fats present in the sewage are broken into simpler compounds. The nitrogen is converted into ammonia and the colloidal matter is flocculated, liquified and then finally digested.

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