What is the main function of a septic tank in a household sanitation system?
Correct answer: B. It settles solids and partly decomposes sewage
- A. It stores drinking water for later household use
- B. It settles solids and partly decomposes sewage
- C. It disinfects sewage completely before discharge
- D. It removes all chemical pollutants from sewage
Explanation
A septic tank allows solids to settle and undergo anaerobic decomposition before the liquid effluent leaves the tank. It does not completely disinfect sewage, so the effluent still needs suitable soil absorption or further treatment.
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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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