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What is biological oxygen demand ?...

What is biological oxygen demand ?

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The BOD (Biological oxygen demand ).BOD refers to the amount of the oxygen that would be consumed , if all the organic matter in one litre of water were oxidized by bacteria . The sewage water is treated till the BOD is reduced . The greater the BOD of the waste water more is its polluting potential.
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Assertion: The Biological Oxygen Demand (BOD) is high in raw sewage. Reason: The greater the BOD in waste water, the lesser is its polluting potential.

High value of BOD (biochemical oxygen demand ) indicates that: