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In sewage treatment, the **primary treatment** is essentially:
AChemical disinfection by chlorination
BBiological — by aerobic microbes
CPhysical removal of small/large particles via filtration and sedimentation; floating debris → filtered, grit → settled
DDistillation
Answer & Solution
Correct answer: C. Physical removal of small/large particles via filtration and sedimentation; floating debris → filtered, grit → settled
**Primary treatment = physical removal** of particles. Floating debris → filtered; grit (soil, pebbles) → sedimented. Solids that settle = **primary sludge**; supernatant = **effluent** for secondary treatment.
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