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Whqt is secondary treatment of sewage

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Whqt is secondary treatment of sewage

    • Posted by Anantha Krishnan 7 years ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 7 years ago

    •  Primary effluent is passed into large aeration tanks with constant mechanical agitation and air supply.
    • Useful aerobic microbes grow rapidly and form flocs.
    •  Flocs are masses of bacteria and consumes organic matter and thus reduce the biochemical oxygen demand (BOD).
    • When BOD of sewage has reduced, the effluent is passed into Settling tank.
    • Here, the bacterial flocs settle and sediment is called activated sludge.
    • A small part of the sludge is used as an inoculum in the aeration tank and the remaining part is passed into large tanks called anaerobic sludge digesters.
    • In the digesters, heterotrophic microbes anaerobically digest bacteria and fungi in sludge producing mixture of gases such as methane, H2S, CO2 which forms the biogas.

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