Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

A. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter

B. the nitrite and eventually to the nitrate

C. All A., B. and C.

D. Oxidation of carbonaceous matter to CO2

E. Coagulation and flocculation of colloids

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