Sewage water is purified by ..........

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(B) Sewage treatment plants $(STPs)$ primarily rely on heterotrophic microorganisms naturally present in the sewage to purify the water. During the se

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Microorganisms

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(B) Sewage treatment plants $(STPs)$ primarily rely on heterotrophic microorganisms naturally present in the sewage to purify the water. During the secondary treatment (biological treatment),these microbes consume the organic matter present in the sewage,thereby reducing the Biological Oxygen Demand $(BOD)$ of the effluent.

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