Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Reflects and absorbs the longer wavelength (infra-red) radiations
All of these
Prevents solar heat being radiated out completely, resulting in
Allows visible solar radiation (ultraviolet) of short wave-length to pass through

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

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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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