Environmental Engineering in CE
Lagoons used for purification of polluted water

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
Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
All of these

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Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

All of these
Destroys/removes pathogen much more effectively if the sewage is chlorinated
Destroys/removes pathogen from the sewage
Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

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