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Which of the following is a secondary treatment for water pollution?

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in Biology – Class 12 by (271k points)
Which of the following is a secondary treatment for water pollution?

(a) Sedimentation

(b) By the action of microbes

(c) Removal of nitrates

(d) Filtration

The question was posed to me at a job interview.

This question is from Environmental Issues topic in chapter Environmental Issues of Biology – Class 12

1 Answer

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Best answer
The correct choice is (b) By the action of microbes

The best explanation: Also known as the active sludge process, in this method, the seed sludge is added to the wastewater for its further breakdown. This happens with the help of microbes that consume the remaining organic matter.

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