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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 nonbiodegradable 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
Answer: (d).all (a), (b) & (c).
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