In sewage treatment,secondary treatment is co | vedclass

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(C) is the correct answer. Secondary treatment is highly significant because it reduces the $BOD$ level of sewage.Primary treatment involves the physi

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it reduces the $BOD$ level of sewage

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(C) is the correct answer. Secondary treatment is highly significant because it reduces the $BOD$ level of sewage.Primary treatment involves the physical removal of large and small particles through filtration and sedimentation.The effluent from primary treatment is then passed into large aeration tanks for secondary treatment (biological treatment).In these tanks,aerobic microbes consume the major part of the organic matter present in the effluent.This significant reduction in organic matter leads to a decrease in the Biochemical Oxygen Demand $(BOD)$ of the sewage,making it safer to discharge into water bodies.

In sewage treatment,secondary treatment is considered highly significant,because

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