Which of the following enhances BOD of water?
Correct answer: C. Sugar mill effluents
- A. Algae
- B. Sand
- C. Sugar mill effluents
- D. Moss
Explanation
Sugar mill effluents contain abundant biodegradable organic matter, which microorganisms decompose while consuming dissolved oxygen, thereby increasing biochemical oxygen demand. Sand does not add such an oxygen-consuming load.
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