The relation between the biochemical oxygen demand of a wastewater or treatment plant effluent and the oxygen available in the diluting water. The quantity of oxygen utilized in the oxidation of substances in a specified time, at a specified temperature and under specified conditions. The process of contacting water, wastewater or air with ozone for purposes of disinfection, oxidation or odor control. It is a highly reactive but unstable oxidant, used for disinfection, oxidation, or odor control in wastewater processes as well as water treatment processes. It is a product of the photochemical process involving sun's energy.
Ozone exists in the upper atmosphere zone layer as well as at the earth's surface.
Ozone at the earth's surface causes numerous adverse health effects and is a major component of smog.