Secondary sewage treatment is mainly a

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(D) Secondary sewage treatment,also known as biological treatment,involves the use of aerobic and anaerobic microorganisms to decompose the organic ma

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Biological process

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(D) Secondary sewage treatment,also known as biological treatment,involves the use of aerobic and anaerobic microorganisms to decompose the organic matter present in the primary effluent. The primary treatment is a physical process involving filtration and sedimentation,whereas the secondary treatment relies on microbial activity to reduce the Biological Oxygen Demand $(BOD)$ of the sewage.

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