Disinfection: The process of Ultraviolet Irradiation (generated by low pressure mercury vapor lamps) is the most widely

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Disinfection:
The process of Ultraviolet Irradiation (generated by low pressure mercury vapor lamps) is the most
widely used primary disinfection process in modern drinking water treatment plants in the United States
and abroad, while chlorination is the most widely used approach for secondary disinfection (only
applied in the United States)
a) Describe the reason(s) why UV Irradiation generated using LPMVL is an effective primary
disinfectant. (8 points)
b) Why does UV Irradiation is not considered as an alternative secondary disinfectant? (8 points)
c) Describe the main property of chlorine in water that makes it the best choice as secondary chemical
disinfectant (9 points).