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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
OXYGEN-DEMANDING WASTE. Any organic material that will stimulate the metabolism of bacteria with a corresponding use of Dissolved Oxygen (DO) when discharged into a natural waterway.Frequently used as a euphemism for domestic sewage. Also see Oxygen Demand.nvironmental Engineering Dictionary. Any organic material that will stimulate the metabolism of bacteria with a corresponding use of Dissolved Oxygen (DO) when discharged into a natural waterway.