Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

All of these
Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
Destroys/removes pathogen from the sewage
Destroys/removes pathogen much more effectively if the sewage is chlorinated

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Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Oxidation of carbonaceous matter to CO₂
Coagulation and flocculation of colloids
All of these
Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

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Environmental Engineering in CE
Smoke is produced due to

Poor design & overloading of furnace
Poor quality of fuel and improper mixing of fuel & combustion air
All of these
Insufficient supply of combustion air and insufficient time for combustion

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