Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

CO
CFC (chloro fluoro carbons)
NOx
SO₂

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Environmental Engineering in CE
Lagoons used for purification of polluted water

Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
All of these
Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre
Use micro-organisms/bacteria in presence of dissolved oxygen

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