Question

The relation between COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand) is

• A. COD>BOD
• B. COD = BOD
• C. COD<BOD
• D. No relation between COD and BOD

Hint:

Understanding the relationship between COD and BOD helps in assessing water pollution levels and designing effective treatment strategies for mine wastewater.

Answer 1

The Correct Option is A

Chemical Oxygen Demand (COD) measures the total amount of oxygen required to chemically oxidize organic and inorganic matter in water, while Biochemical Oxygen Demand (BOD) measures the oxygen required by microorganisms to biologically degrade organic matter. Since COD includes both biodegradable and non-biodegradable substances, while BOD only accounts for biodegradable organic matter, COD is typically greater than BOD in most samples, especially in mining effluents where non-biodegradable pollutants may be present. There is a clear relationship between the two, as BOD is a subset of COD.
Thus, the correct answer is COD>BOD.