Multiple choice

Primary treatment of sewage involves

  1. Production of biogas

  2. Physical removal of particles by filtration and sedimentation

  3. Formation of floc

  4. Digestion of floc by anaerobic microbes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Primary treatment of sewage is a physical process that involves the removal of large and small particles through filtration and sedimentation. Biological processes like floc formation occur during secondary treatment.

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