Answer (1)
20th Apr, 2022
In Class 12 Biology (Microbes in Human Welfare), sewage treatment is mainly done in 4 major steps/methods:
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Primary treatment – physical removal of large particles by filtration and sedimentation.
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Secondary treatment (biological treatment) – microbes break down organic matter (activated sludge process).
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Anaerobic digestion – anaerobic bacteria digest sludge and produce biogas.
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Disinfection – treated water is disinfected (chlorination/ozonation) before release.
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