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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.
Although glycolysis requires two ATPs, the reactions produce four ATP, two NADH, molecules that are used to drive ATP synthesis in the mitochondria and two pyruvate molecules. Although glycolysis doesnât require oxygen, the fate of the pyruvate molecules depends on whether oxygen is present. If oxygen isnât available, the pyruvate is converted to lactate, and no additional ATP is produced from this conversion. If oxygen is present, the pyruvates are transported into the mitochondrial matrix.