Pick the correct statement regarding wastewater treatment plant.

Bacteria are removed along with suspended solids from the sewage

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All bacteria are harmful and are removed early on from the sewage

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Bacteria are not removed from the sewage at all

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Bacteria are necessary for treatment of sewage and are removed at last

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Solution

The correct option is D
Bacteria are necessary for treatment of sewage and are removed at last

Bacteria are an important part of sewage treatment and plays a major role in almost every stage. Thus, they are used for sewage treatment. Bacteria are removed in the final stage of treatment to ensure that water is safe to drink and use.

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Question 21

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