Which of the following is the most widely used disinfectant in water treatment ?
Correct answer: D. Chlorine
- A. Coagulation
- B. Irradiation of water by ultraviolet light
- C. Cation exchanger
- D. Chlorine
Explanation
Chlorine is the most widely used disinfectant because it is effective, relatively inexpensive, and leaves a residual that protects water during distribution. UV irradiation disinfects without leaving such a residual.
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