Aerobic biological oxidation ponds used for the purification of polluted water

[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

Explanation:

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