Environmental Engineering in CE
Iron & manganese present as pollutant in water can not be removed by

Ion exchange process
Lime soda process or manganese zeolite process
Oxidation followed by settling & filtration
Chlorination

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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

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

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