allerySewage treatment begins with a stage that removes particles by:
APhysical means
BChemical means
CMagnetic means
DElectrical means
Answer & Solution
Correct answer: A. Physical means
1. The first stage deals with floating debris and grit.
2. It uses filtration and sedimentation.
3. So the removal is physical.
_Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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