Which of the following is purification of water at large scale – a) Disinfection of well b) Rapid sand filterc) Slow sand filterd) Household purification
Correct Answer: bc
Description: Purification of water
Purification of water is of great importance in community.
The method of treatment to be employed depends upon the nature of raw water, and the desired standards of water quality.
For example ground water (deep well, tube well and springs) may need no treatment. On the other hand surface water (river) requires extensive treatment.
Purification of water may be : -
Purification on large scale
Storage
Filtration
Slow sand (Biological filter)
Rapid sand (mechanical filter)
3. Disinfection
Chlorination
Ozonation
UV irradiation
Purification on small scale
Household purification
Boiling
Chemical disinfection
2. Disinfection of wells
Category:
Social & Preventive Medicine
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