In the polluted water, the values of:
Correct answer: D. COD much higher than BOD
- A. BOD much higher than COD
- B. BOD slightly higher than COD
- C. COD slightly higher than BOD
- D. COD much higher than BOD
Explanation
COD includes oxygen needed to oxidize both biodegradable and non-biodegradable substances, whereas BOD measures mainly biodegradable organic matter. Thus COD is normally higher, and in heavily polluted water the difference may be large.
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