Question:
High COD to BOD ratio of an organic pollutant represents ............
High COD to BOD ratio of an organic pollutant represents ............
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COD includes both biodegradable and non-biodegradable components, whereas BOD includes only the biodegradable portion. A higher COD/BOD ratio means less biodegradable material.
Updated On: Jun 17, 2025
- high biodegradability of the pollutant
- low biodegradability of the pollutant
- low total organic content of the pollutant
- presence of free oxygen for aerobic decomposition
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The Correct Option is B
Solution and Explanation
COD (Chemical Oxygen Demand) measures the total quantity of oxygen required to chemically oxidize both biodegradable and non-biodegradable organic matter. BOD (Biochemical Oxygen Demand), on the other hand, measures only the oxygen needed by microorganisms to break down biodegradable organic matter.
A high COD to BOD ratio implies that a significant portion of the organic matter is non-biodegradable, since COD accounts for more than just the biodegradable fraction measured by BOD. Hence, the biodegradability is low. \[ \text{High COD/BOD ratio} ⇒ \text{Low Biodegradability} \] Thus, the correct answer is option (2).
A high COD to BOD ratio implies that a significant portion of the organic matter is non-biodegradable, since COD accounts for more than just the biodegradable fraction measured by BOD. Hence, the biodegradability is low. \[ \text{High COD/BOD ratio} ⇒ \text{Low Biodegradability} \] Thus, the correct answer is option (2).
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