DISSOLVED OXYGEN
In wastewater treatment plants, oxygen is a critical component in the degradation of organic matter. Although the oxygen contained in various compounds and components of the wastewater may also be available, that oxygen is far more difficult for the organisms to access than the dissolved form. The dissolved form of oxygen, or DO, is measured in milligrams per liter. There are numerous commercially available DO meters that can measure DO concentrations in real time and with high accuracy. Continuous DO monitors are routinely installed in key locations within wastewater treatment plants to aid in the monitoring of the plant's health.
The amount of oxygen that can be maintained in water, and thus the resulting concentration of oxygen, is most directly a function of temperature, among other things. Many times, the maximum DO concentration possible in pure water has been determined.
The maximum DO concentration varies slightly with temperature, according to various sources. That is frequently determined by the salinity of the water and the atmospheric temperature at the time the measurements were taken.
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