Which step is used to destroy disease-causing microorganisms after water has been clarified and filtered?
Correct answer: A. Disinfection by chlorination or boiling
- A. Disinfection by chlorination or boiling
- B. Sedimentation in a storage tank
- C. Straining through a clean cloth
- D. Aeration by exposing water to air
Explanation
Disinfection is the final protective step that destroys many remaining pathogens after suspended particles have been removed. Sedimentation, straining and aeration may improve appearance or taste but do not reliably make water safe.
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About Environmental Health and Sanitation
Environmental health examines how water, air, food, housing, waste, noise, chemicals and workplace conditions affect disease and well-being. Sanitation content includes safe water treatment and storage, sewage and solid-waste disposal, food hygiene, vector control and the distinction between personal cleanliness and broader public-health sanitation.
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