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What do you mean by BOD and COD?

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COD or Chemical Oxygen Demand is the total measurement of all chemicals (organics & in-organics) in the water / waste water;

BOD is a measure of the amount of oxygen that require for the bacteria to degrade the organic components present in water / waste water.

The ratio of BOD/COD is about COD is higher than that of BOD; maximum of up to 4 times in medium scale industries; but it varies based on the industrial process and nature of the raw materials used;

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