Aerobic biological oxidation ponds used for the purification of polluted water__________________?
Correct answer: B. All A., B. & C.
- A. Destroys/removes pathogen from the sewage
- B. All A., B. & C.
- C. Destroys/removes pathogen much more effectively if the sewage is chlorinated
- D. Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
Explanation
Aerobic oxidation ponds reduce pathogens and biodegradable organic matter, but they are ineffective against many non-biodegradable compounds such as ABS. Subsequent chlorination improves pathogen removal, so all three statements apply.
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