Following completion of Chapter 5, 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. Disinfect new and existing wells.
6. Disinfect mains and storage tanks.
7. Calculate chlorine dosage.
8. Determine hypochlorinator and chlorinator settings.
9. Operate and maintain hypochlorinators.
10. Operate and maintain chlorinators.
11. Troubleshoot chlorination systems.
12. Conduct a chlorine safety program.

The main purpose of this chapter is to make operators aware of the importance of disinfecting water supply facilities and water. The chapter explains the principles of disinfection and provides operators with the procedures for disinfecting facilities, as well as procedures for operating and maintaining chlorination equipment.

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