Abstract
The paper presents the main characteristics of ozone and the large domain of wastewater treatment. Ozone has been used as an alternative to chlorine for many years. It can also be used to eliminate taste and odors, and aids in the removal of bacteria. It is a powerful disinfectant, and inactivates viruses, cysts, fungi and spores, which are not susceptible to chlorine disinfectant. Used to purify drinking water in Europe over 100 years ago, Ozone is coming to the forefront once again.