What is the role of ultraviolet (UV) radiation in the water purification systems?
- It inactivates /kills the harmful microorganisms in water.
- It removes all the undesirable odours from the water.
- It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of the water.
Detailed Explanation:
✅ Statement 1 – Correct: UV radiation damages the DNA/RNA of microorganisms (bacteria, viruses, protozoa), effectively inactivating or killing them and making it a powerful disinfection method in water purification.
❌ Statement 2 – Incorrect: UV radiation does not remove odours from water; odour removal requires activated carbon filtration, aeration, or chemical treatment.
❌ Statement 3 – Incorrect: UV radiation does not affect sedimentation, turbidity removal, or water clarity; these processes require coagulation, flocculation, and filtration.
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