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Secondary treatment of sewage is almost always

  • A.a biological process
  • B.a physical settling process
  • C.a chemical precipitation process
  • D.an irradiation process

Answer: A

The point of the stage is to have microorganisms consume the dissolved and colloidal organic matter that settling cannot remove, whether in suspension as activated sludge or as a biofilm on media. Both routes rely on microbial metabolism.

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