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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 also may be delivered via a liquid oxygen system. Liquid oxygen turns into a gas when you use it. This means that large amounts of oxygen can be stored in a small container. When the portable liquid oxygen system is empty, you can fill it from a larger liquid stationary system.