(D) Secondary treatment of sewage,also known as biological treatment,involves the microbial digestion of organic matter. During this process,aerobic m

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Involves microbial digestion of organic matter

(D) Secondary treatment of sewage,also known as biological treatment,involves the microbial digestion of organic matter. During this process,aerobic microbes consume the organic waste present in the sewage,significantly reducing the Biological Oxygen Demand $(BOD)$.