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What do you mean by Biochemical Oxygen Demand (BOD)?

12.13.    What do you mean by Biochemical Oxygen Demand (BOD)?

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Biochemical Oxygen Demand (BOD)
It is the amount of oxygen required by bacteria to decompose the organic matter present in a  certain volume of the sample of water. Clean water would have a BOD value less than 5 ppm and highly polluted water could have a BOD value of 17 ppm.

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