Which approach is NOT typically part of water treatment methods?

The evaporation method is not typically classified as a water treatment process aimed at purifying drinking water or addressing contaminants. In water treatment, the focus is on removing harmful substances and pathogens to make water safe for consumption.

Coagulation, ozonation, and chlorination are all established methods used in water treatment. Coagulation involves adding chemicals to water that bind with impurities, allowing them to form larger particles that can be easily removed. Ozonation applies ozone to the water, which is a powerful oxidant that can effectively kill bacteria and break down organic materials. Chlorination involves adding chlorine to water as a disinfectant, which helps eliminate pathogens and ensure the water is safe to drink.

In contrast, evaporation generally refers to the process of converting liquid water into vapor, often applied in contexts such as salt production or concentrating liquids but not in the context of conventional water treatment methods aimed at purifying water for human consumption. Therefore, evaporation does not fit with the other three methods, making it the correct choice for what is not a typical water treatment method.