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Wastewater Story — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceWastewater Story2 Marks
Question
Why bacteria are used in sewage treatment plants?
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Answer

The bacteria decompose the suspended waste that includes domestic wastes & other undesirable organic substances present in the clarified water. The activity of bacteria produces decomposed organic material from which solid waste is separated. This solid waste is used as manure.

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