oxygen sag curve
oxygen sag curve The curve obtained when the concentration of dissolved oxygen in a river into which sewage or some other pollutant has been discharged is plotted against the distance downstream from the sewage outlet (see graph). Samples of water are taken at areas upstream and downstream from the sewage outlet. The presence of sewage reduces the oxygen content of the water and increases the biochemical oxygen demand. This is due to the action of saprotrophic organisms that decompose the organic matter in the sewage and in the process use up the available oxygen.
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Sewage , sewage Waste matter from industrial and domestic sources that is dissolved or suspended in water. Raw (untreated) sewage is a pollutant. It has a hig… Juvenile Water , juvenile water Original water, formed as a result of magmatic processes. Juvenile water has never been in the atmosphere. Magmatic water can form in… Water Conservation , The hydrosphere refers to that portion of the earth that is made of water , including all oceans, lakes, rivers , streams, glaciers , and underground… Dissolved Oxygen , Dissolved oxygen is the amount of oxygen present in fresh water, such as a stream, or freshwater lake. A certain amount of dissolved oxygen is requir… Water storage , water storage See WATER INVENTORY.
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oxygen sag curve