Environmental Engineering in CE
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

Oxidation of unburnt hydrocarbon fuel in the second compartment
All of these
Conversion of CO into CO₂ in the second compartment
Conversion of NOx into N₂ and NH₃ in the first compartment

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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 much more effectively if the sewage is chlorinated
Destroys/removes pathogen from the sewage

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