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प्रश्न
Give the basic steps involved in secondary treatment of sewage water.
अति संक्षिप्त उत्तर
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उत्तर
Aeration encourages aerobic microbes to form flocs and digest organic matter; the flocs then settle as activated sludge.
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पाठ 14: Microbes in Human Welfare - EXERCISES [पृष्ठ ७६१]
