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Question
Aerobic biological oxidation ponds used for the purification of polluted water__________________?
Options:
A .  Destroys/removes pathogen from the sewage
B .  Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
C .  Destroys/removes pathogen much more effectively if the sewage is chlorinated
D .  All A., B. & C.
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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