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Primary treatment of sewage is essentially a

  • A.chemical disinfection process using chlorine
  • B.membrane filtration process
  • C.physical sedimentation process
  • D.biological oxidation process

Answer: C

Sewage is held in a tank long enough for settleable solids to fall out as sludge and grease to be skimmed from the surface. No microbial degradation is intended, which is why the stage is described as physical rather than biological.

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