CWEA Advanced Water Treatment Practice Test

The primary purpose of using ozone in a water treatment process is for disinfection and oxidation of contaminants. Ozone is a powerful oxidizing agent that can effectively kill bacteria, viruses, and other pathogens present in water, making it an excellent choice for disinfection. Additionally, ozone can oxidize organic and inorganic pollutants, breaking them down into less harmful substances. This dual functionality not only enhances water quality by removing harmful microorganisms but also aids in the reduction of taste and odor compounds.

In contrast, other processes like pH adjustment, flocculation, and reduction of hardness utilize different chemical agents and methods that do not derive the same benefits as ozone. The specific nature of ozone's actions as an oxidant and disinfectant marks its distinct role in ensuring safe and clean water treatment.