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  4. Flocs, which are used in the secondary treatment of sewage, are:

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Q. Flocs, which are used in the secondary treatment of sewage, are:

NTA AbhyasNTA Abhyas 2022

Solution:

Flocs are aerobic masses of bacteria associated with fungal filaments forming mesh like structures. These microbes consume the major part of the organic matter in the effluent reducing its biological oxygen demand.