Secondary treatment of sewage involves the use of which type of process?

Question

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Secondary treatment of sewage involves the biological removal of dissolved organic matter. This is typically achieved by using microorganisms to break down and consume the organic matter in the sewage, resulting in a reduction in oxygen-demanding substances and nutrients that could potentially harm aquatic life. Physical/chemical removal of insoluble particulate materials (B) is typically associated with primary treatment, while biological removal of inorganic nutrients (C) is often part of tertiary treatment. Virus removal/inactivation (D) is not always a component of secondary treatment, but may be included in certain sewage treatment processes depending on the specific location and regulatory requirements.

Secondary Treatment of Sewage Involves the Use of Which Type