Discussion
Chemical oxygen demand exceeds biochemical oxygen demand for the same sample because it also oxidises
Answer: B
Correct answer: matter that micro-organisms cannot degrade
The biochemical demand measures only what micro-organisms will oxidise in five days; the chemical demand uses a strong oxidising agent in acid and attacks nearly all the organic matter, biodegradable or not. The ratio of the two is therefore useful in itself, indicating how amenable an effluent is to biological treatment.
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