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

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

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Environmental Engineering in CE
Smoke is produced due to

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

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