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Microbes In Human Welfare

Question

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Define BOD and COD.

Solution

BOD (Biological oxygen demand) measures the milligrams of oxygen consumed during the biological decomposition of organic matter occurring in a litre of waste water during a specified period of time.

COD (Chemical oxygen demand) determines the milligrams of oxygen per litre of waste water which are consumed during the oxidation of the organic matter to give carbon dioxide, ammonia, and water.

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