Biological control during sewage treatment is observed in?

Aerating tanks

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Settling tanks

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Anaerobic sludge digesters

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Primary treatment

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Solution

The correct option is A Aerating tanks
In Secondary treatment or Biological treatment, the primary efluent is passed through large aeration tanks with constant mechanical agitation and air supply. Useful aerobic microbes grow rapidly and form flocs. The growing microbes consume organic matter and thereby, reduce the BOD of the effluent.
So, the correct option is 'Aerating tanks'.

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