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chemical engineering environmental engineering
1. Aerobic biological oxidation ponds used for the purification of polluted water
(A): all (a), (b) & (c).
(B): destroys/removes pathogen from the sewage.
(C): destroys/removes pathogen much more effectively if the sewage is chlorinated.
(D): is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents.
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