Which of the following enhances BOD of water?
Correct answer: D. Sugar mill effluents
- A. Algae
- B. Sand
- C. Moss
- D. Sugar mill effluents
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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