What methods are used to treat polluted water?

Polluted water can be treated using various methods, including physical, chemical, and biological processes. Physical methods involve filtration and sedimentation to remove suspended solids. Chemical treatments often include coagulation, flocculation, and disinfection using chlorine or UV light to eliminate pathogens. Biological treatments utilize microorganisms to break down organic contaminants in processes such as activated sludge or constructed wetlands.