difference between bod and cod in Tabular Form with Examples

 Here's a tabular comparison between BOD and COD:

Parameters	BOD (Biochemical Oxygen Demand)	COD (Chemical Oxygen Demand)
Definition	The amount of oxygen required by aerobic microorganisms to break down organic matter in water under specific conditions.	The measure of the amount of oxygen required to chemically oxidize the organic and inorganic matter present in water.
Purpose	Used to determine the organic strength of wastewater, measuring the amount of biodegradable organic matter present in water.	Used to assess the total amount of organic and inorganic pollutants present in water, regardless of whether or not they are biodegradable.
Measurement Units	BOD is measured in milligrams of oxygen per liter (mg/L).	COD is measured in milligrams of oxygen per liter (mg/L).
Time requirement	BOD takes 5 days to complete the test.	COD takes only 2-3 hours to complete the test.
Specificity	BOD only measures the biodegradable organic matter present in water.	COD measures both biodegradable and non-biodegradable organic and inorganic matter present in water.
Applications	Used to determine the effectiveness of wastewater treatment plants, the degree of water pollution and the organic quality of water.	Used to determine the level of water pollution, quality of water for drinking, industrial wastewater discharge control, and the overall efficiency of wastewater treatment processes.
Example	BOD would be used to measure the organic pollution in a river caused by a factory.	COD would be used to assess the pollution level in industrial wastewater discharged from a chemical plant.

In summary, while both BOD and COD are important measures of water quality, they differ in their purpose, measurement units, time requirements, specificity, and applications. BOD measures only the biodegradable organic matter present in water, while COD measures both biodegradable and non-biodegradable organic and inorganic matter present in water.