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 nonbiodegradable substances (e.g. ABS) containing effluents.
C : destroys/removes pathogen much more effectively if the sewage is chlorinated.
D : all (a), (b) & (c).
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