Treatment of waste-water is done by the

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(C) The treatment of waste-water (sewage) is primarily carried out by heterotrophic microbes. These microorganisms are naturally present in the sewage

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Heterotrophic microbes naturally present in sewage

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(C) The treatment of waste-water (sewage) is primarily carried out by heterotrophic microbes. These microorganisms are naturally present in the sewage and are utilized in the secondary treatment process (biological treatment). They consume the organic matter present in the sewage,thereby reducing the Biological Oxygen Demand $(BOD)$ of the effluent.

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