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Lagoons used for purification of polluted water | |
A. | are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds. [Wrong Answer] |
B. | use micro-organisms/bacteria in presence of dissolved oxygen. [Wrong Answer] |
C. | 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. [Wrong Answer] |
D. | all (a), (b) & (c). [Correct Answer] |