Treatment of waste water is done by the :

Autotraphic microbes

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Heterotrophic microbes

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Chemoautotrophic microbes

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All of the above

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Solution

The correct option is B Heterotrophic microbes
Autotrophs of greatest significance in sanitary engineering are the nitrifying, sulfur, and iron. Because these bacteria use CO $_{2}$ as the carbon source and oxidize inorganic compounds for energy.
So the correct option is ' heterotrophic microbes'.

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