Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

6.5
0.05
15
1

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

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