California Wastewater Treatment Operator Practice Exam

The ozonation process in wastewater treatment involves the use of ozone gas, which is a powerful oxidizing agent. This process is primarily utilized for both the oxidation of contaminants and the disinfection of wastewater. Ozone can effectively break down various organic pollutants, including those that are not easily removed by conventional treatment methods. Furthermore, it kills pathogens by disrupting their cellular structures, making it an efficient alternative to chlorine for disinfection purposes.

Ozone is generated on-site, typically from oxygen, and is introduced into the wastewater stream. Its high reactivity allows it to quickly oxidize and disinfect without leaving harmful residues, as ozone reverts back to oxygen after it has done its work. This makes ozonation a favored treatment method in many advanced wastewater treatment facilities.

The other processes mentioned do not accurately define ozonation. For example, the removal of large solids pertains to physical processes, while biological treatment involves the use of microbes, which is distinct from the chemical mechanisms at play in ozonation. Similarly, nutrient removal processes focus on specific chemical reactions to eliminate nitrogen and phosphorus compounds, which differ from ozone's disinfection and oxidation capabilities.