What is BOD ( Biological Oxygen Demand) ?

          BOD ( Biological Oxygen Demand) is a measure of the total amount of oxygen, which will be taken up by the chemical and organic matter in the effluent. 
> This is usually associated with a specific period and that normally taken is 5 days period. 
> The value is written as BOD5, and is determined by incubating one litre sample of sewage at 20oC diluted in sufficiently well oxygenated water. 
> The amount of oxygen absorbed over the 5 days period is measured.

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