Correct Answer - Option 4 : Aluminum treatment
Disinfection:
Water disinfection means the removal, deactivation or killing of pathogenic microorganisms.
Microorganisms are destroyed or deactivated, resulting in termination of growth and reproduction. When microorganisms are not removed from drinking water, drinking water usage will cause people to fall ill.
Method of disinfection
1. Physical method
- Boiling
- Pasteurizing
- Nonionizing radiation such as ultraviolet (UV) light.
2. Chemical method
- Treatment with additional lime
- By potassium permanganate
- By Chlorine compounds
- Ozonation
