Following completion of Chapter 7, students should be able to:

1. Describe the factors that influence disinfection.
2. Explain the process of disinfection using chlorine, hypochlorite, chlorine dioxide, and chloramines.
3. Describe the breakpoint chlorination process.
4. Identify the various points of chlorine application.
5. Operate and maintain chlorination equipment.
6. Handle chlorine safely.
7. Select the proper chlorine dosage.
8. Start up and shut down chlorination equipment.
9. Troubleshoot chlorination systems.
10. Develop and conduct a chlorine safety program.
11. Describe the principles of water disinfection using ultraviolet (UV) systems.
12. Safely operate, maintain, and troubleshoot ultraviolet (UV) systems.
13. Outline the main advantages and limitations of water disinfection using ozone systems.

The main purpose of this chapter is to teach operators how to safely start up, operate, shut down, and maintain disinfection facilities with special emphasis on chlorination processes. Chlorine must be handled with extreme care at all times.

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