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STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 8. microbes in human welfare1 Mark
MCQ
Physical removal of large and small stable solid particles from the sewage through filtration and sedimentation is called
  • ✓
    Primary treatment
  • B
    Secondary treatment
  • C
    Tertiary treatment
  • D
    Quaternary treatment
✓

Answer

Correct option: A.
Primary treatment
a
Primary treatment of sewage is mostly mechanical and concerned mainly with the removal of coarse solid material through filtration and sedimentation

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