Write the differences between BOD and COD

CBSE Class 12
1

Write the differences between BOD and COD.

2

Differences between BOD and COD

BOD COD
1. BOD refers to Biochemical Oxygen Demand. 1. COD refers to Chemical Oxygen Demand.
2. BOD is the oxygen required for the decomposition of unit mass of organic matter by microbes. 2. COD is the oxygen required for the chemical oxidation of unit mass of reduced organic and inorganic matter.
3. It is comparatively lower. 3. It is comparatively higher.
4. Involves only aerobic decomposer microbes. 4. Involves chemical oxidants.