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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.
This is highly impractical. The biggest issue is the volume ratios. For the chemical reaction to proceed, you need 2 liters of hydrogen gas for every 1 liter of oxygen gas (at equivalent temperature and pressure). Those 3 liters of gas will yield 2 liters of water vapor, which then has to be cooled to produce water.